Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

34 files changed, 4812 insertions, 0 deletions

diff --git a/layout/printing/DrawEventRecorder.cpp b/layout/printing/DrawEventRecorder.cpp
new file mode 100644
index 0000000000..69b9b48ae6
--- /dev/null
+++ b/layout/printing/DrawEventRecorder.cpp
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DrawEventRecorder.h"
+
+namespace mozilla {
+namespace layout {
+
+void DrawEventRecorderPRFileDesc::RecordEvent(
+    const gfx::RecordedEvent& aEvent) {
+  aEvent.RecordToStream(mOutputStream);
+
+  Flush();
+}
+
+DrawEventRecorderPRFileDesc::~DrawEventRecorderPRFileDesc() {
+  if (IsOpen()) {
+    Close();
+  }
+}
+
+void DrawEventRecorderPRFileDesc::Flush() { mOutputStream.Flush(); }
+
+bool DrawEventRecorderPRFileDesc::IsOpen() { return mOutputStream.IsOpen(); }
+
+void DrawEventRecorderPRFileDesc::OpenFD(PRFileDesc* aFd) {
+  MOZ_DIAGNOSTIC_ASSERT(!IsOpen());
+
+  mOutputStream.OpenFD(aFd);
+  WriteHeader(mOutputStream);
+}
+
+void DrawEventRecorderPRFileDesc::Close() {
+  MOZ_DIAGNOSTIC_ASSERT(IsOpen());
+
+  mOutputStream.Close();
+}
+
+void DrawEventRecorderPRFileDesc::AddDependentSurface(uint64_t aDependencyId) {
+  mDependentSurfaces.AppendElement(aDependencyId);
+}
+
+nsTArray<uint64_t>&& DrawEventRecorderPRFileDesc::TakeDependentSurfaces() {
+  return std::move(mDependentSurfaces);
+}
+
+}  // namespace layout
+}  // namespace mozilla
diff --git a/layout/printing/DrawEventRecorder.h b/layout/printing/DrawEventRecorder.h
new file mode 100644
index 0000000000..79eaa65ef4
--- /dev/null
+++ b/layout/printing/DrawEventRecorder.h
@@ -0,0 +1,167 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_printing_DrawEventRecorder_h
+#define mozilla_layout_printing_DrawEventRecorder_h
+
+#include <memory>
+
+#include "mozilla/gfx/DrawEventRecorder.h"
+#include "mozilla/gfx/RecordingTypes.h"
+#include "prio.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace layout {
+
+class PRFileDescStream final : public mozilla::gfx::EventStream {
+  // Most writes, as seen in the print IPC use case, are very small (<32 bytes),
+  // with a small number of very large (>40KB) writes. Writes larger than this
+  // value are not buffered.
+  static const size_t kBufferSize = 1024;
+
+ public:
+  PRFileDescStream()
+      : mFd(nullptr), mBuffer(nullptr), mBufferPos(0), mGood(true) {}
+  PRFileDescStream(const PRFileDescStream& other) = delete;
+  ~PRFileDescStream() { Close(); }
+
+  void OpenFD(PRFileDesc* aFd) {
+    MOZ_DIAGNOSTIC_ASSERT(!IsOpen());
+    mFd = aFd;
+    mGood = !!mFd;
+    mBuffer.reset(new uint8_t[kBufferSize]);
+    mBufferPos = 0;
+  }
+
+  void Close() {
+    // We need to be API compatible with std::ostream, and so we silently handle
+    // closes on a closed FD.
+    if (IsOpen()) {
+      Flush();
+      PR_Close(mFd);
+      mFd = nullptr;
+      mBuffer.reset();
+      mBufferPos = 0;
+    }
+  }
+
+  bool IsOpen() { return mFd != nullptr; }
+
+  void Flush() {
+    // See comment in Close().
+    if (IsOpen() && mBufferPos > 0) {
+      PRInt32 length =
+          PR_Write(mFd, static_cast<const void*>(mBuffer.get()), mBufferPos);
+      mGood = length >= 0 && static_cast<size_t>(length) == mBufferPos;
+      mBufferPos = 0;
+    }
+  }
+
+  void Seek(PRInt64 aOffset, PRSeekWhence aWhence) {
+    Flush();
+    PRInt64 pos = PR_Seek64(mFd, aOffset, aWhence);
+    mGood = pos != -1;
+  }
+
+  void write(const char* aData, size_t aSize) override {
+    if (!good()) {
+      return;
+    }
+
+    // See comment in Close().
+    if (IsOpen()) {
+      // If we're writing more data than could ever fit in our buffer, flush the
+      // buffer and write directly.
+      if (aSize > kBufferSize) {
+        Flush();
+        PRInt32 length = PR_Write(mFd, static_cast<const void*>(aData), aSize);
+        mGood = length >= 0 && static_cast<size_t>(length) == aSize;
+        // If our write could fit in our buffer, but doesn't because the buffer
+        // is partially full, write to the buffer, flush the buffer, and then
+        // write the rest of the data to the buffer.
+      } else if (aSize > AvailableBufferSpace()) {
+        size_t length = AvailableBufferSpace();
+        WriteToBuffer(aData, length);
+        Flush();
+
+        WriteToBuffer(aData + length, aSize - length);
+        // Write fits in the buffer.
+      } else {
+        WriteToBuffer(aData, aSize);
+      }
+    }
+  }
+
+  void read(char* aOut, size_t aSize) override {
+    if (!good()) {
+      return;
+    }
+
+    Flush();
+    PRInt32 res = PR_Read(mFd, static_cast<void*>(aOut), aSize);
+    mGood = res >= 0 && (static_cast<size_t>(res) == aSize);
+  }
+
+  bool good() final { return mGood; }
+
+  void SetIsBad() final { mGood = false; }
+
+ private:
+  size_t AvailableBufferSpace() { return kBufferSize - mBufferPos; }
+
+  void WriteToBuffer(const char* aData, size_t aSize) {
+    MOZ_ASSERT(aSize <= AvailableBufferSpace());
+    memcpy(mBuffer.get() + mBufferPos, aData, aSize);
+    mBufferPos += aSize;
+  }
+
+  PRFileDesc* mFd;
+  std::unique_ptr<uint8_t[]> mBuffer;
+  size_t mBufferPos;
+  bool mGood;
+};
+
+class DrawEventRecorderPRFileDesc final : public gfx::DrawEventRecorderPrivate {
+ public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DrawEventRecorderPRFileDesc, override)
+  explicit DrawEventRecorderPRFileDesc() = default;
+  ~DrawEventRecorderPRFileDesc();
+
+  void RecordEvent(const gfx::RecordedEvent& aEvent) override;
+
+  /**
+   * Returns whether a recording file is currently open.
+   */
+  bool IsOpen();
+
+  /**
+   * Opens the recorder with the provided PRFileDesc *.
+   */
+  void OpenFD(PRFileDesc* aFd);
+
+  /**
+   * Closes the file so that it can be processed. The recorder does NOT forget
+   * which objects it has recorded. This can be used with OpenNew, so that a
+   * recording can be processed in chunks. The file must be open.
+   */
+  void Close();
+
+  void AddDependentSurface(uint64_t aDependencyId) override;
+  nsTArray<uint64_t>&& TakeDependentSurfaces();
+
+ private:
+  void Flush() override;
+
+  PRFileDescStream mOutputStream;
+  nsTArray<uint64_t> mDependentSurfaces;
+};
+
+}  // namespace layout
+
+}  // namespace mozilla
+
+#endif /* mozilla_layout_printing_DrawEventRecorder_h */
diff --git a/layout/printing/PrintTranslator.cpp b/layout/printing/PrintTranslator.cpp
new file mode 100644
index 0000000000..b3d5609a08
--- /dev/null
+++ b/layout/printing/PrintTranslator.cpp
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PrintTranslator.h"
+
+#include "gfxContext.h"
+#include "nsDeviceContext.h"
+#include "mozilla/gfx/RecordedEvent.h"
+#include "mozilla/gfx/RecordingTypes.h"
+#include "mozilla/UniquePtr.h"
+#include "InlineTranslator.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace layout {
+
+PrintTranslator::PrintTranslator(nsDeviceContext* aDeviceContext)
+    : mDeviceContext(aDeviceContext) {
+  UniquePtr<gfxContext> context =
+      mDeviceContext->CreateReferenceRenderingContext();
+  mBaseDT = context->GetDrawTarget();
+}
+
+bool PrintTranslator::TranslateRecording(PRFileDescStream& aRecording) {
+  uint32_t magicInt;
+  ReadElement(aRecording, magicInt);
+  if (magicInt != mozilla::gfx::kMagicInt) {
+    return false;
+  }
+
+  uint16_t majorRevision;
+  ReadElement(aRecording, majorRevision);
+  if (majorRevision != kMajorRevision) {
+    return false;
+  }
+
+  uint16_t minorRevision;
+  ReadElement(aRecording, minorRevision);
+  if (minorRevision > kMinorRevision) {
+    return false;
+  }
+
+  int32_t eventType;
+  ReadElement(aRecording, eventType);
+  while (aRecording.good()) {
+    bool success = RecordedEvent::DoWithEventFromStream(
+        aRecording, static_cast<RecordedEvent::EventType>(eventType),
+        [&](RecordedEvent* recordedEvent) -> bool {
+          // Make sure that the whole event was read from the stream.
+          if (!aRecording.good()) {
+            return false;
+          }
+
+          return recordedEvent->PlayEvent(this);
+        });
+
+    if (!success) {
+      return false;
+    }
+
+    ReadElement(aRecording, eventType);
+  }
+
+  return true;
+}
+
+already_AddRefed<DrawTarget> PrintTranslator::CreateDrawTarget(
+    ReferencePtr aRefPtr, const gfx::IntSize& aSize,
+    gfx::SurfaceFormat aFormat) {
+  UniquePtr<gfxContext> context = mDeviceContext->CreateRenderingContext();
+  if (!context) {
+    NS_WARNING("Failed to create rendering context for print.");
+    return nullptr;
+  }
+
+  RefPtr<DrawTarget> drawTarget = context->GetDrawTarget();
+  AddDrawTarget(aRefPtr, drawTarget);
+  return drawTarget.forget();
+}
+
+}  // namespace layout
+}  // namespace mozilla
diff --git a/layout/printing/PrintTranslator.h b/layout/printing/PrintTranslator.h
new file mode 100644
index 0000000000..87a8fed808
--- /dev/null
+++ b/layout/printing/PrintTranslator.h
@@ -0,0 +1,170 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_PrintTranslator_h
+#define mozilla_layout_PrintTranslator_h
+
+#include <istream>
+
+#include "DrawEventRecorder.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Filters.h"
+#include "mozilla/gfx/RecordedEvent.h"
+
+class nsDeviceContext;
+
+namespace mozilla {
+namespace layout {
+
+using gfx::DrawTarget;
+using gfx::FilterNode;
+using gfx::GradientStops;
+using gfx::NativeFontResource;
+using gfx::Path;
+using gfx::RecordedDependentSurface;
+using gfx::ReferencePtr;
+using gfx::ScaledFont;
+using gfx::SourceSurface;
+using gfx::Translator;
+using gfx::UnscaledFont;
+
+class PrintTranslator final : public Translator {
+ public:
+  explicit PrintTranslator(nsDeviceContext* aDeviceContext);
+
+  bool TranslateRecording(PRFileDescStream& aRecording);
+
+  DrawTarget* LookupDrawTarget(ReferencePtr aRefPtr) final {
+    DrawTarget* result = mDrawTargets.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  Path* LookupPath(ReferencePtr aRefPtr) final {
+    Path* result = mPaths.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  SourceSurface* LookupSourceSurface(ReferencePtr aRefPtr) final {
+    SourceSurface* result = mSourceSurfaces.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  FilterNode* LookupFilterNode(ReferencePtr aRefPtr) final {
+    FilterNode* result = mFilterNodes.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  already_AddRefed<GradientStops> LookupGradientStops(
+      ReferencePtr aRefPtr) final {
+    return mGradientStops.Get(aRefPtr);
+  }
+
+  ScaledFont* LookupScaledFont(ReferencePtr aRefPtr) final {
+    ScaledFont* result = mScaledFonts.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  UnscaledFont* LookupUnscaledFont(ReferencePtr aRefPtr) final {
+    UnscaledFont* result = mUnscaledFonts.GetWeak(aRefPtr);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  NativeFontResource* LookupNativeFontResource(uint64_t aKey) final {
+    NativeFontResource* result = mNativeFontResources.GetWeak(aKey);
+    MOZ_ASSERT(result);
+    return result;
+  }
+
+  void AddDrawTarget(ReferencePtr aRefPtr, DrawTarget* aDT) final {
+    mDrawTargets.InsertOrUpdate(aRefPtr, RefPtr{aDT});
+  }
+
+  void AddPath(ReferencePtr aRefPtr, Path* aPath) final {
+    mPaths.InsertOrUpdate(aRefPtr, RefPtr{aPath});
+  }
+
+  void AddSourceSurface(ReferencePtr aRefPtr, SourceSurface* aSurface) final {
+    mSourceSurfaces.InsertOrUpdate(aRefPtr, RefPtr{aSurface});
+  }
+
+  void AddFilterNode(ReferencePtr aRefPtr, FilterNode* aFilter) final {
+    mFilterNodes.InsertOrUpdate(aRefPtr, RefPtr{aFilter});
+  }
+
+  void AddGradientStops(ReferencePtr aRefPtr, GradientStops* aStops) final {
+    mGradientStops.InsertOrUpdate(aRefPtr, RefPtr{aStops});
+  }
+
+  void AddScaledFont(ReferencePtr aRefPtr, ScaledFont* aScaledFont) final {
+    mScaledFonts.InsertOrUpdate(aRefPtr, RefPtr{aScaledFont});
+  }
+
+  void AddUnscaledFont(ReferencePtr aRefPtr,
+                       UnscaledFont* aUnscaledFont) final {
+    mUnscaledFonts.InsertOrUpdate(aRefPtr, RefPtr{aUnscaledFont});
+  }
+
+  void AddNativeFontResource(uint64_t aKey,
+                             NativeFontResource* aScaledFontResouce) final {
+    mNativeFontResources.InsertOrUpdate(aKey, RefPtr{aScaledFontResouce});
+  }
+
+  void RemoveDrawTarget(ReferencePtr aRefPtr) final {
+    mDrawTargets.Remove(aRefPtr);
+  }
+
+  void RemovePath(ReferencePtr aRefPtr) final { mPaths.Remove(aRefPtr); }
+
+  void RemoveSourceSurface(ReferencePtr aRefPtr) final {
+    mSourceSurfaces.Remove(aRefPtr);
+  }
+
+  void RemoveFilterNode(ReferencePtr aRefPtr) final {
+    mFilterNodes.Remove(aRefPtr);
+  }
+
+  void RemoveGradientStops(ReferencePtr aRefPtr) final {
+    mGradientStops.Remove(aRefPtr);
+  }
+
+  void RemoveScaledFont(ReferencePtr aRefPtr) final {
+    mScaledFonts.Remove(aRefPtr);
+  }
+
+  void RemoveUnscaledFont(ReferencePtr aRefPtr) final {
+    mUnscaledFonts.Remove(aRefPtr);
+  }
+
+  already_AddRefed<DrawTarget> CreateDrawTarget(
+      ReferencePtr aRefPtr, const gfx::IntSize& aSize,
+      gfx::SurfaceFormat aFormat) final;
+
+  mozilla::gfx::DrawTarget* GetReferenceDrawTarget() final { return mBaseDT; }
+
+ private:
+  RefPtr<nsDeviceContext> mDeviceContext;
+  RefPtr<DrawTarget> mBaseDT;
+
+  nsRefPtrHashtable<nsPtrHashKey<void>, DrawTarget> mDrawTargets;
+  nsRefPtrHashtable<nsPtrHashKey<void>, Path> mPaths;
+  nsRefPtrHashtable<nsPtrHashKey<void>, SourceSurface> mSourceSurfaces;
+  nsRefPtrHashtable<nsPtrHashKey<void>, FilterNode> mFilterNodes;
+  nsRefPtrHashtable<nsPtrHashKey<void>, GradientStops> mGradientStops;
+  nsRefPtrHashtable<nsPtrHashKey<void>, ScaledFont> mScaledFonts;
+  nsRefPtrHashtable<nsPtrHashKey<void>, UnscaledFont> mUnscaledFonts;
+  nsRefPtrHashtable<nsUint64HashKey, NativeFontResource> mNativeFontResources;
+};
+
+}  // namespace layout
+}  // namespace mozilla
+
+#endif  // mozilla_layout_PrintTranslator_h
diff --git a/layout/printing/crashtests/1662259.html b/layout/printing/crashtests/1662259.html
new file mode 100644
index 0000000000..0e5d338635
--- /dev/null
+++ b/layout/printing/crashtests/1662259.html
@@ -0,0 +1,7 @@
+<script>
+window.onload = () => {
+  SpecialPowers.wrap(window).printPreview()?.close()
+}
+</script>
+<body hidden>
+<iframe src='file:'>
diff --git a/layout/printing/crashtests/1663722.html b/layout/printing/crashtests/1663722.html
new file mode 100644
index 0000000000..aa20d8fa60
--- /dev/null
+++ b/layout/printing/crashtests/1663722.html
@@ -0,0 +1,11 @@
+<html class="reftest-wait">
+<head>
+  <script>
+    document.addEventListener("DOMContentLoaded", () => {
+      const proxy = SpecialPowers.wrap(self).printPreview();
+      proxy.sizeToContent();
+      document.documentElement.className = "";
+    })
+  </script>
+</head>
+</html>
diff --git a/layout/printing/crashtests/1671503.html b/layout/printing/crashtests/1671503.html
new file mode 100644
index 0000000000..5399c7d71e
--- /dev/null
+++ b/layout/printing/crashtests/1671503.html
@@ -0,0 +1,12 @@
+<html class="reftest-wait">
+<script>
+document.addEventListener("DOMContentLoaded", () => {
+  window.setTimeout(() => {
+    SpecialPowers.wrap(window).printPreview()?.close()
+    SpecialPowers.wrap(window).printPreview()?.close()
+    document.documentElement.className = "";
+  }, 0)
+})
+</script>
+<iframe src='data:text/html,foo'></iframe>
+</html>
diff --git a/layout/printing/crashtests/1748277.html b/layout/printing/crashtests/1748277.html
new file mode 100644
index 0000000000..9cfbef2c46
--- /dev/null
+++ b/layout/printing/crashtests/1748277.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<style>
+    @namespace url(http://www.w3.org/1998/Math/MathML);
+
+    * {
+        padding-inline-start: 27em;
+        break-after: page;
+        content: url(1748277.png);
+        writing-mode: sideways-lr;
+    }
+</style>
+<script>
+  document.addEventListener("DOMContentLoaded", () => {
+    SpecialPowers.wrap(window).printPreview()?.close()
+  })
+</script>
+<math>
+  <mfrac>
+    <munder>
+      <ms>
+        <mglyph>
+        </mglyph>
+      </ms>
+    </munder>
+  </mfrac>
+</math>
diff --git a/layout/printing/crashtests/1748277.png b/layout/printing/crashtests/1748277.png
new file mode 100644
index 0000000000..6bcf82782e
--- /dev/null
+++ b/layout/printing/crashtests/1748277.png
diff --git a/layout/printing/crashtests/1758199-1.html b/layout/printing/crashtests/1758199-1.html
new file mode 100644
index 0000000000..9a2deedce2
--- /dev/null
+++ b/layout/printing/crashtests/1758199-1.html
@@ -0,0 +1,13 @@
+<script>
+window.onload = () => {
+  let o = document.getElementById('a')
+  o.parentNode.appendChild(o)
+  window.print()
+  window.requestIdleCallback(() => { document.write('') })
+}
+</script>
+<style>
+:first-of-type { padding-block-start: 99% }
+</style>
+<mark id='a'>
+<embed src='#'>
diff --git a/layout/printing/crashtests/1804571.html b/layout/printing/crashtests/1804571.html
new file mode 100644
index 0000000000..b4f1c7dad3
--- /dev/null
+++ b/layout/printing/crashtests/1804571.html
@@ -0,0 +1,11 @@
+<script>
+window.onload = () => {
+  SpecialPowers.wrap(window).printPreview()?.close()
+}
+</script>
+<style>
+:only-child { float: left }
+</style>
+<ruby>
+<label>
+a
diff --git a/layout/printing/crashtests/1804794.html b/layout/printing/crashtests/1804794.html
new file mode 100644
index 0000000000..e071b392a4
--- /dev/null
+++ b/layout/printing/crashtests/1804794.html
@@ -0,0 +1,10 @@
+<script>
+window.onload = () => {
+  SpecialPowers.wrap(window).printPreview()?.close()
+}
+</script>
+<style>
+html { column-count: 5 }
+</style>
+<hr style="page: a">
+<a>A</a>
diff --git a/layout/printing/crashtests/1804798.html b/layout/printing/crashtests/1804798.html
new file mode 100644
index 0000000000..dedf5d8ea9
--- /dev/null
+++ b/layout/printing/crashtests/1804798.html
@@ -0,0 +1,7 @@
+<script>
+window.onload = () => {
+  SpecialPowers.wrap(window).printPreview()?.close()
+}
+</script>
+<textarea></textarea>
+<textarea>
diff --git a/layout/printing/crashtests/1819468-1.html b/layout/printing/crashtests/1819468-1.html
new file mode 100644
index 0000000000..1ce7ded9e2
--- /dev/null
+++ b/layout/printing/crashtests/1819468-1.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<style>
+.c {
+  break-after: page;
+  page: Rotated;
+}
+</style>
+<script>
+document.addEventListener("DOMContentLoaded", () => {
+  b.insertAdjacentHTML("afterBegin", a.innerHTML)
+  SpecialPowers.wrap(window).printPreview()?.close()
+})
+</script>
+<audio>
+<optgroup id="a">
+<option class="c">a</option>
+</audio>
+<menu style="max-height: 0em">
+<menu id="b"></menu>
+</menu>
+<select class="c">
diff --git a/layout/printing/crashtests/1819468-2.html b/layout/printing/crashtests/1819468-2.html
new file mode 100644
index 0000000000..65b957d95f
--- /dev/null
+++ b/layout/printing/crashtests/1819468-2.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<style>
+.c {
+  break-after: page;
+  page: Rotated;
+}
+</style>
+<script>
+document.addEventListener("DOMContentLoaded", () => {
+  SpecialPowers.wrap(window).printPreview()?.close()
+})
+</script>
+<menu style="max-height: 0em">
+<menu id="b">
+<option class="c">a</option>
+</menu>
+</menu>
+<select class="c">
diff --git a/layout/printing/crashtests/509839-1.html b/layout/printing/crashtests/509839-1.html
new file mode 100644
index 0000000000..fefa9060bb
--- /dev/null
+++ b/layout/printing/crashtests/509839-1.html
@@ -0,0 +1,10 @@
+<html class="reftest-paged"><head>
+<title>Crash [@ nsViewManager::CreateView][@ nsCSSFrameConstructor::AddFrameConstructionItemsInternal] on closing print preview with -moz-transform, position: fixed table displays</title>
+</head><body>
+<div style="position: fixed;">
+<div style="display: table-header-group; -moz-transform: rotate(1deg);">
+<div style="position: relative;"></div>
+<div style="display: table-row;page-break-before: always;"></div>
+</div>
+</body>
+</html>
diff --git a/layout/printing/crashtests/509839-2.html b/layout/printing/crashtests/509839-2.html
new file mode 100644
index 0000000000..f04630246a
--- /dev/null
+++ b/layout/printing/crashtests/509839-2.html
@@ -0,0 +1,8 @@
+<html style="position: fixed; -moz-transform: scale(0.000001);"  class="reftest-paged">
+<head>
+</head>
+<body>
+<div style="display: table-row;"></div>
+<div style="display: table-row; page-break-before: right;"></div>
+</body>
+</html>
diff --git a/layout/printing/crashtests/576878.xhtml b/layout/printing/crashtests/576878.xhtml
new file mode 100644
index 0000000000..428fed9307
--- /dev/null
+++ b/layout/printing/crashtests/576878.xhtml
@@ -0,0 +1,9 @@
+<html xmlns="http://www.w3.org/1999/xhtml"  xmlns:mathml="http://www.w3.org/1998/Math/MathML"  class="reftest-paged">
+
+<mathml:mfenced style="position: fixed;">
+<span style="position: inherit; float: right;"><span style="position:fixed;">b</span></span>
+</mathml:mfenced>
+<div style="page-break-before: always; "/>
+
+m
+</html>
diff --git a/layout/printing/crashtests/793844.html b/layout/printing/crashtests/793844.html
new file mode 100644
index 0000000000..3165fc1794
--- /dev/null
+++ b/layout/printing/crashtests/793844.html
@@ -0,0 +1,10 @@
+<html class="reftest-paged">
+<head>
+<title>crash in nsContentList::nsContentList on print preview</title>
+</head><body>
+
+<iframe  onload="window.location.reload()" src="data:text/html,">
+</iframe>
+
+
+</body></html>
diff --git a/layout/printing/crashtests/crashtests.list b/layout/printing/crashtests/crashtests.list
new file mode 100644
index 0000000000..5cd72ad44d
--- /dev/null
+++ b/layout/printing/crashtests/crashtests.list
@@ -0,0 +1,14 @@
+load 509839-1.html
+load 509839-2.html
+load 576878.xhtml
+asserts-if(Android,0-1) load 793844.html
+skip-if(Android) load 1662259.html
+skip-if(Android) load 1663722.html
+skip-if(Android) load 1671503.html
+load 1748277.html # Bug 1751260
+load 1758199-1.html
+load 1804571.html
+load 1804798.html
+load 1804794.html
+load 1819468-1.html
+load 1819468-2.html
diff --git a/layout/printing/ipc/PRemotePrintJob.ipdl b/layout/printing/ipc/PRemotePrintJob.ipdl
new file mode 100644
index 0000000000..00f4d5ff7c
--- /dev/null
+++ b/layout/printing/ipc/PRemotePrintJob.ipdl
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PContent;
+
+namespace mozilla {
+namespace layout {
+
+[ChildImpl=virtual, ParentImpl=virtual]
+async protocol PRemotePrintJob
+{
+  manager PContent;
+
+both:
+  // Tell either side to abort printing and clean up.
+  async AbortPrint(nsresult aRv);
+
+parent:
+  // Initialize the real print device with the given information.
+  async InitializePrint(nsString aDocumentTitle,
+                        int32_t aStartPage, int32_t aEndPage);
+
+  // Translate the page recording writen into |fd| and play back the events to
+  // the real print device.
+  async ProcessPage(uint64_t[] deps);
+
+  // This informs the real print device that we've finished, so it can trigger
+  // the actual print.
+  async FinalizePrint();
+
+  // Report a progress change to listeners in the parent process.
+  async ProgressChange(long aCurSelfProgress,
+                       long aMaxSelfProgress,
+                       long aCurTotalProgress,
+                       long aMaxTotalProgress);
+
+  // Report a status change to listeners in the parent process.
+  async StatusChange(nsresult aStatus);
+
+child:
+  // Inform the child that the print has been initialized in the parent or has
+  // failed with result aRv. Includes a file descriptor which the first page
+  // can be written to.
+  async PrintInitializationResult(nsresult aRv, FileDescriptor aFd);
+
+  // Inform the child that the latest page has been processed remotely. Includes
+  // a file descriptor which the next page can be written to.
+  async PageProcessed(FileDescriptor aFd);
+
+  async __delete__();
+};
+
+} // namespace layout
+} // namespace mozilla
diff --git a/layout/printing/ipc/RemotePrintJobChild.cpp b/layout/printing/ipc/RemotePrintJobChild.cpp
new file mode 100644
index 0000000000..5db0b342a3
--- /dev/null
+++ b/layout/printing/ipc/RemotePrintJobChild.cpp
@@ -0,0 +1,169 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "RemotePrintJobChild.h"
+
+#include "mozilla/SpinEventLoopUntil.h"
+#include "mozilla/Unused.h"
+#include "nsPagePrintTimer.h"
+#include "nsPrintJob.h"
+#include "private/pprio.h"
+
+namespace mozilla {
+namespace layout {
+
+NS_IMPL_ISUPPORTS(RemotePrintJobChild, nsIWebProgressListener)
+
+RemotePrintJobChild::RemotePrintJobChild() = default;
+
+nsresult RemotePrintJobChild::InitializePrint(const nsString& aDocumentTitle,
+                                              const int32_t& aStartPage,
+                                              const int32_t& aEndPage) {
+  // Print initialization can sometimes display a dialog in the parent, so we
+  // need to spin a nested event loop until initialization completes.
+  Unused << SendInitializePrint(aDocumentTitle, aStartPage, aEndPage);
+  mozilla::SpinEventLoopUntil("RemotePrintJobChild::InitializePrint"_ns,
+                              [&]() { return mPrintInitialized; });
+
+  return mInitializationResult;
+}
+
+mozilla::ipc::IPCResult RemotePrintJobChild::RecvPrintInitializationResult(
+    const nsresult& aRv, const mozilla::ipc::FileDescriptor& aFd) {
+  mPrintInitialized = true;
+  mInitializationResult = aRv;
+  if (NS_SUCCEEDED(aRv)) {
+    SetNextPageFD(aFd);
+  }
+  return IPC_OK();
+}
+
+PRFileDesc* RemotePrintJobChild::GetNextPageFD() {
+  MOZ_ASSERT(!mDestroyed);
+  MOZ_ASSERT(mNextPageFD);
+  PRFileDesc* fd = mNextPageFD;
+  mNextPageFD = nullptr;
+  return fd;
+}
+
+void RemotePrintJobChild::SetNextPageFD(
+    const mozilla::ipc::FileDescriptor& aFd) {
+  MOZ_ASSERT(!mDestroyed);
+  auto handle = aFd.ClonePlatformHandle();
+  mNextPageFD = PR_ImportFile(PROsfd(handle.release()));
+}
+
+void RemotePrintJobChild::ProcessPage(nsTArray<uint64_t>&& aDeps) {
+  MOZ_ASSERT(mPagePrintTimer);
+
+  mPagePrintTimer->WaitForRemotePrint();
+  if (!mDestroyed) {
+    Unused << SendProcessPage(std::move(aDeps));
+  }
+}
+
+mozilla::ipc::IPCResult RemotePrintJobChild::RecvPageProcessed(
+    const mozilla::ipc::FileDescriptor& aFd) {
+  MOZ_ASSERT(mPagePrintTimer);
+  SetNextPageFD(aFd);
+
+  mPagePrintTimer->RemotePrintFinished();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemotePrintJobChild::RecvAbortPrint(
+    const nsresult& aRv) {
+  MOZ_ASSERT(mPrintJob);
+
+  mPrintJob->CleanupOnFailure(aRv, true);
+  return IPC_OK();
+}
+
+void RemotePrintJobChild::SetPagePrintTimer(nsPagePrintTimer* aPagePrintTimer) {
+  MOZ_ASSERT(!mDestroyed);
+  MOZ_ASSERT(aPagePrintTimer);
+
+  mPagePrintTimer = aPagePrintTimer;
+}
+
+void RemotePrintJobChild::SetPrintJob(nsPrintJob* aPrintJob) {
+  MOZ_ASSERT(!mDestroyed);
+  MOZ_ASSERT(aPrintJob);
+
+  mPrintJob = aPrintJob;
+}
+
+// nsIWebProgressListener
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnStateChange(nsIWebProgress* aProgress,
+                                   nsIRequest* aRequest, uint32_t aStateFlags,
+                                   nsresult aStatus) {
+  // `RemotePrintJobParent` emits its own state change events based on its
+  // own progress & the actor lifecycle, so any forwarded event here would get
+  // ignored.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnProgressChange(nsIWebProgress* aProgress,
+                                      nsIRequest* aRequest,
+                                      int32_t aCurSelfProgress,
+                                      int32_t aMaxSelfProgress,
+                                      int32_t aCurTotalProgress,
+                                      int32_t aMaxTotalProgress) {
+  if (!mDestroyed) {
+    Unused << SendProgressChange(aCurSelfProgress, aMaxSelfProgress,
+                                 aCurTotalProgress, aMaxTotalProgress);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnLocationChange(nsIWebProgress* aProgress,
+                                      nsIRequest* aRequest, nsIURI* aURI,
+                                      uint32_t aFlags) {
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnStatusChange(nsIWebProgress* aProgress,
+                                    nsIRequest* aRequest, nsresult aStatus,
+                                    const char16_t* aMessage) {
+  if (NS_SUCCEEDED(mInitializationResult) && !mDestroyed) {
+    Unused << SendStatusChange(aStatus);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnSecurityChange(nsIWebProgress* aProgress,
+                                      nsIRequest* aRequest, uint32_t aState) {
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RemotePrintJobChild::OnContentBlockingEvent(nsIWebProgress* aProgress,
+                                            nsIRequest* aRequest,
+                                            uint32_t aEvent) {
+  return NS_OK;
+}
+
+// End of nsIWebProgressListener
+
+RemotePrintJobChild::~RemotePrintJobChild() = default;
+
+void RemotePrintJobChild::ActorDestroy(ActorDestroyReason aWhy) {
+  mPagePrintTimer = nullptr;
+  mPrintJob = nullptr;
+
+  mDestroyed = true;
+}
+
+}  // namespace layout
+}  // namespace mozilla
diff --git a/layout/printing/ipc/RemotePrintJobChild.h b/layout/printing/ipc/RemotePrintJobChild.h
new file mode 100644
index 0000000000..5ca635d713
--- /dev/null
+++ b/layout/printing/ipc/RemotePrintJobChild.h
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_RemotePrintJobChild_h
+#define mozilla_layout_RemotePrintJobChild_h
+
+#include "mozilla/layout/PRemotePrintJobChild.h"
+
+#include "mozilla/RefPtr.h"
+#include "nsIWebProgressListener.h"
+
+class nsPagePrintTimer;
+class nsPrintJob;
+
+namespace mozilla {
+namespace layout {
+
+class RemotePrintJobChild final : public PRemotePrintJobChild,
+                                  public nsIWebProgressListener {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIWEBPROGRESSLISTENER
+
+  RemotePrintJobChild();
+
+  void ActorDestroy(ActorDestroyReason aWhy) final;
+
+  nsresult InitializePrint(const nsString& aDocumentTitle,
+                           const int32_t& aStartPage, const int32_t& aEndPage);
+
+  mozilla::ipc::IPCResult RecvPrintInitializationResult(
+      const nsresult& aRv, const FileDescriptor& aFd) final;
+
+  void ProcessPage(nsTArray<uint64_t>&& aDeps);
+
+  mozilla::ipc::IPCResult RecvPageProcessed(const FileDescriptor& aFd) final;
+
+  mozilla::ipc::IPCResult RecvAbortPrint(const nsresult& aRv) final;
+
+  void SetPagePrintTimer(nsPagePrintTimer* aPagePrintTimer);
+
+  void SetPrintJob(nsPrintJob* aPrintJob);
+
+  PRFileDesc* GetNextPageFD();
+
+  [[nodiscard]] bool IsDestroyed() const { return mDestroyed; }
+
+ private:
+  ~RemotePrintJobChild() final;
+  void SetNextPageFD(const mozilla::ipc::FileDescriptor& aFd);
+
+  bool mPrintInitialized = false;
+  bool mDestroyed = false;
+  nsresult mInitializationResult = NS_OK;
+  RefPtr<nsPagePrintTimer> mPagePrintTimer;
+  RefPtr<nsPrintJob> mPrintJob;
+  PRFileDesc* mNextPageFD = nullptr;
+};
+
+}  // namespace layout
+}  // namespace mozilla
+
+#endif  // mozilla_layout_RemotePrintJobChild_h
diff --git a/layout/printing/ipc/RemotePrintJobParent.cpp b/layout/printing/ipc/RemotePrintJobParent.cpp
new file mode 100644
index 0000000000..8b3d5d5bd9
--- /dev/null
+++ b/layout/printing/ipc/RemotePrintJobParent.cpp
@@ -0,0 +1,316 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "RemotePrintJobParent.h"
+
+#include <fstream>
+
+#include "gfxContext.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Unused.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDeviceContext.h"
+#include "nsIDeviceContextSpec.h"
+#include "nsIPrintSettings.h"
+#include "nsIWebProgressListener.h"
+#include "PrintTranslator.h"
+#include "private/pprio.h"
+#include "nsAnonymousTemporaryFile.h"
+
+namespace mozilla::layout {
+
+RemotePrintJobParent::RemotePrintJobParent(nsIPrintSettings* aPrintSettings)
+    : mPrintSettings(aPrintSettings),
+      mIsDoingPrinting(false),
+      mStatus(NS_ERROR_UNEXPECTED) {
+  MOZ_COUNT_CTOR(RemotePrintJobParent);
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvInitializePrint(
+    const nsAString& aDocumentTitle, const int32_t& aStartPage,
+    const int32_t& aEndPage) {
+  nsresult rv = InitializePrintDevice(aDocumentTitle, aStartPage, aEndPage);
+  if (NS_FAILED(rv)) {
+    Unused << SendPrintInitializationResult(rv, FileDescriptor());
+    mStatus = rv;
+    Unused << Send__delete__(this);
+    return IPC_OK();
+  }
+
+  mPrintTranslator.reset(new PrintTranslator(mPrintDeviceContext));
+  FileDescriptor fd;
+  rv = PrepareNextPageFD(&fd);
+  if (NS_FAILED(rv)) {
+    Unused << SendPrintInitializationResult(rv, FileDescriptor());
+    mStatus = rv;
+    Unused << Send__delete__(this);
+    return IPC_OK();
+  }
+
+  Unused << SendPrintInitializationResult(NS_OK, fd);
+  return IPC_OK();
+}
+
+nsresult RemotePrintJobParent::InitializePrintDevice(
+    const nsAString& aDocumentTitle, const int32_t& aStartPage,
+    const int32_t& aEndPage) {
+  nsresult rv;
+  nsCOMPtr<nsIDeviceContextSpec> deviceContextSpec =
+      do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1", &rv);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = deviceContextSpec->Init(mPrintSettings, false);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mPrintDeviceContext = new nsDeviceContext();
+  rv = mPrintDeviceContext->InitForPrinting(deviceContextSpec);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoString fileName;
+  mPrintSettings->GetToFileName(fileName);
+
+  rv = mPrintDeviceContext->BeginDocument(aDocumentTitle, fileName, aStartPage,
+                                          aEndPage);
+  if (NS_FAILED(rv)) {
+    NS_WARNING_ASSERTION(rv == NS_ERROR_ABORT,
+                         "Failed to initialize print device");
+    return rv;
+  }
+
+  mIsDoingPrinting = true;
+
+  return NS_OK;
+}
+
+nsresult RemotePrintJobParent::PrepareNextPageFD(FileDescriptor* aFd) {
+  PRFileDesc* prFd = nullptr;
+  nsresult rv = NS_OpenAnonymousTemporaryFile(&prFd);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  *aFd = FileDescriptor(
+      FileDescriptor::PlatformHandleType(PR_FileDesc2NativeHandle(prFd)));
+  mCurrentPageStream.OpenFD(prFd);
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvProcessPage(
+    nsTArray<uint64_t>&& aDeps) {
+  if (!mCurrentPageStream.IsOpen()) {
+    Unused << SendAbortPrint(NS_ERROR_FAILURE);
+    return IPC_OK();
+  }
+  mCurrentPageStream.Seek(0, PR_SEEK_SET);
+
+  if (aDeps.IsEmpty()) {
+    FinishProcessingPage();
+    return IPC_OK();
+  }
+
+  nsTHashSet<uint64_t> deps;
+  for (auto i : aDeps) {
+    deps.Insert(i);
+  }
+
+  gfx::CrossProcessPaint::Start(std::move(deps))
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [self = RefPtr{this}](
+              gfx::CrossProcessPaint::ResolvedFragmentMap&& aFragments) {
+            self->FinishProcessingPage(&aFragments);
+          },
+          [self = RefPtr{this}](const nsresult& aRv) {
+            self->FinishProcessingPage();
+          });
+
+  return IPC_OK();
+}
+
+void RemotePrintJobParent::FinishProcessingPage(
+    gfx::CrossProcessPaint::ResolvedFragmentMap* aFragments) {
+  nsresult rv = PrintPage(mCurrentPageStream, aFragments);
+
+  mCurrentPageStream.Close();
+
+  PageDone(rv);
+}
+
+nsresult RemotePrintJobParent::PrintPage(
+    PRFileDescStream& aRecording,
+    gfx::CrossProcessPaint::ResolvedFragmentMap* aFragments) {
+  MOZ_ASSERT(mPrintDeviceContext);
+
+  nsresult rv = mPrintDeviceContext->BeginPage();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  if (aFragments) {
+    mPrintTranslator->SetDependentSurfaces(aFragments);
+  }
+  if (!mPrintTranslator->TranslateRecording(aRecording)) {
+    mPrintTranslator->SetDependentSurfaces(nullptr);
+    return NS_ERROR_FAILURE;
+  }
+  mPrintTranslator->SetDependentSurfaces(nullptr);
+
+  rv = mPrintDeviceContext->EndPage();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+void RemotePrintJobParent::PageDone(nsresult aResult) {
+  MOZ_ASSERT(mIsDoingPrinting);
+
+  if (NS_FAILED(aResult)) {
+    Unused << SendAbortPrint(aResult);
+  } else {
+    FileDescriptor fd;
+    aResult = PrepareNextPageFD(&fd);
+    if (NS_FAILED(aResult)) {
+      Unused << SendAbortPrint(aResult);
+    }
+
+    Unused << SendPageProcessed(fd);
+  }
+}
+
+static void NotifyStatusChange(
+    const nsCOMArray<nsIWebProgressListener>& aListeners, nsresult aStatus) {
+  uint32_t numberOfListeners = aListeners.Length();
+  for (uint32_t i = 0; i < numberOfListeners; ++i) {
+    nsIWebProgressListener* listener = aListeners[static_cast<int32_t>(i)];
+    listener->OnStatusChange(nullptr, nullptr, aStatus, nullptr);
+  }
+}
+
+static void NotifyStateChange(
+    const nsCOMArray<nsIWebProgressListener>& aListeners, long aStateFlags,
+    nsresult aStatus) {
+  uint32_t numberOfListeners = aListeners.Length();
+  for (uint32_t i = 0; i < numberOfListeners; ++i) {
+    nsIWebProgressListener* listener = aListeners[static_cast<int32_t>(i)];
+    listener->OnStateChange(nullptr, nullptr, aStateFlags, aStatus);
+  }
+}
+
+static void Cleanup(const nsCOMArray<nsIWebProgressListener>& aListeners,
+                    RefPtr<nsDeviceContext>& aAbortContext,
+                    const bool aPrintingInterrupted, const nsresult aResult) {
+  auto result = aResult;
+  if (MOZ_UNLIKELY(aPrintingInterrupted && NS_SUCCEEDED(result))) {
+    result = NS_ERROR_UNEXPECTED;
+  }
+  if (NS_FAILED(result)) {
+    NotifyStatusChange(aListeners, result);
+  }
+  if (aPrintingInterrupted && aAbortContext) {
+    // Abort any started print.
+    Unused << aAbortContext->AbortDocument();
+  }
+  // However the print went, let the listeners know that we're done.
+  NotifyStateChange(aListeners,
+                    nsIWebProgressListener::STATE_STOP |
+                        nsIWebProgressListener::STATE_IS_DOCUMENT,
+                    result);
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvFinalizePrint() {
+  // EndDocument is sometimes called in the child even when BeginDocument has
+  // not been called. See bug 1223332.
+  if (mPrintDeviceContext) {
+    mPrintDeviceContext->EndDocument()->Then(
+        GetMainThreadSerialEventTarget(), __func__,
+        [listeners = std::move(mPrintProgressListeners)](
+            const mozilla::gfx::PrintEndDocumentPromise::ResolveOrRejectValue&
+                aResult) {
+          // Printing isn't interrupted, so we don't need the device context
+          // here.
+          RefPtr<nsDeviceContext> empty;
+          if (aResult.IsResolve()) {
+            Cleanup(listeners, empty, /* aPrintingInterrupted = */ false,
+                    NS_OK);
+          } else {
+            Cleanup(listeners, empty, /* aPrintingInterrupted = */ false,
+                    aResult.RejectValue());
+          }
+        });
+    mStatus = NS_OK;
+  }
+
+  mIsDoingPrinting = false;
+
+  Unused << Send__delete__(this);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvAbortPrint(
+    const nsresult& aRv) {
+  // Leave the cleanup to `ActorDestroy()`.
+  Unused << Send__delete__(this);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvProgressChange(
+    const long& aCurSelfProgress, const long& aMaxSelfProgress,
+    const long& aCurTotalProgress, const long& aMaxTotalProgress) {
+  // Our progress follows that of `RemotePrintJobChild` closely enough - forward
+  // it instead of keeping more state variables here.
+  for (auto* listener : mPrintProgressListeners) {
+    listener->OnProgressChange(nullptr, nullptr, aCurSelfProgress,
+                               aMaxSelfProgress, aCurTotalProgress,
+                               aMaxTotalProgress);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult RemotePrintJobParent::RecvStatusChange(
+    const nsresult& aStatus) {
+  if (NS_FAILED(aStatus)) {
+    // Remember the failure status for cleanup to forward to listeners.
+    mStatus = aStatus;
+  }
+
+  return IPC_OK();
+}
+
+void RemotePrintJobParent::RegisterListener(nsIWebProgressListener* aListener) {
+  MOZ_ASSERT(aListener);
+
+  // Our listener is a Promise created by CanonicalBrowsingContext::Print
+  mPrintProgressListeners.AppendElement(aListener);
+}
+
+already_AddRefed<nsIPrintSettings> RemotePrintJobParent::GetPrintSettings() {
+  nsCOMPtr<nsIPrintSettings> printSettings = mPrintSettings;
+  return printSettings.forget();
+}
+
+RemotePrintJobParent::~RemotePrintJobParent() {
+  MOZ_COUNT_DTOR(RemotePrintJobParent);
+}
+
+void RemotePrintJobParent::ActorDestroy(ActorDestroyReason aWhy) {
+  if (MOZ_UNLIKELY(mIsDoingPrinting && NS_SUCCEEDED(mStatus))) {
+    mStatus = NS_ERROR_UNEXPECTED;
+  }
+  Cleanup(mPrintProgressListeners, mPrintDeviceContext, mIsDoingPrinting,
+          mStatus);
+  // At any rate, this actor is done and cleaned up.
+  mIsDoingPrinting = false;
+}
+
+}  // namespace mozilla::layout
diff --git a/layout/printing/ipc/RemotePrintJobParent.h b/layout/printing/ipc/RemotePrintJobParent.h
new file mode 100644
index 0000000000..fc568ab3a6
--- /dev/null
+++ b/layout/printing/ipc/RemotePrintJobParent.h
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_RemotePrintJobParent_h
+#define mozilla_layout_RemotePrintJobParent_h
+
+#include "mozilla/layout/PRemotePrintJobParent.h"
+#include "mozilla/layout/printing/DrawEventRecorder.h"
+
+#include "nsCOMArray.h"
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/gfx/RecordedEvent.h"
+#include "mozilla/gfx/CrossProcessPaint.h"
+
+class nsDeviceContext;
+class nsIPrintSettings;
+class nsIWebProgressListener;
+
+namespace mozilla {
+namespace layout {
+
+class PrintTranslator;
+
+class RemotePrintJobParent final : public PRemotePrintJobParent {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(RemotePrintJobParent);
+
+  explicit RemotePrintJobParent(nsIPrintSettings* aPrintSettings);
+
+  void ActorDestroy(ActorDestroyReason aWhy) final;
+
+  mozilla::ipc::IPCResult RecvInitializePrint(const nsAString& aDocumentTitle,
+                                              const int32_t& aStartPage,
+                                              const int32_t& aEndPage) final;
+
+  mozilla::ipc::IPCResult RecvProcessPage(nsTArray<uint64_t>&& aDeps) final;
+
+  mozilla::ipc::IPCResult RecvFinalizePrint() final;
+
+  mozilla::ipc::IPCResult RecvAbortPrint(const nsresult& aRv) final;
+
+  mozilla::ipc::IPCResult RecvProgressChange(
+      const long& aCurSelfProgress, const long& aMaxSelfProgress,
+      const long& aCurTotalProgress, const long& aMaxTotalProgress) final;
+
+  mozilla::ipc::IPCResult RecvStatusChange(const nsresult& aStatus) final;
+
+  /**
+   * Register a progress listener to receive print progress updates.
+   *
+   * @param aListener the progress listener to register. Must not be null.
+   */
+  void RegisterListener(nsIWebProgressListener* aListener);
+
+  /**
+   * @return the print settings for this remote print job.
+   */
+  already_AddRefed<nsIPrintSettings> GetPrintSettings();
+
+ private:
+  ~RemotePrintJobParent() final;
+
+  nsresult InitializePrintDevice(const nsAString& aDocumentTitle,
+                                 const int32_t& aStartPage,
+                                 const int32_t& aEndPage);
+
+  nsresult PrepareNextPageFD(FileDescriptor* aFd);
+
+  nsresult PrintPage(
+      PRFileDescStream& aRecording,
+      gfx::CrossProcessPaint::ResolvedFragmentMap* aFragments = nullptr);
+  void FinishProcessingPage(
+      gfx::CrossProcessPaint::ResolvedFragmentMap* aFragments = nullptr);
+
+  /**
+   * Called to notify our corresponding RemotePrintJobChild once we've
+   * finished printing a page.
+   */
+  void PageDone(nsresult aResult);
+
+  nsCOMPtr<nsIPrintSettings> mPrintSettings;
+  RefPtr<nsDeviceContext> mPrintDeviceContext;
+  UniquePtr<PrintTranslator> mPrintTranslator;
+  nsCOMArray<nsIWebProgressListener> mPrintProgressListeners;
+  PRFileDescStream mCurrentPageStream;
+  bool mIsDoingPrinting;
+  nsresult mStatus;
+};
+
+}  // namespace layout
+}  // namespace mozilla
+
+#endif  // mozilla_layout_RemotePrintJobParent_h
diff --git a/layout/printing/moz.build b/layout/printing/moz.build
new file mode 100644
index 0000000000..f4bfab42f5
--- /dev/null
+++ b/layout/printing/moz.build
@@ -0,0 +1,33 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS.mozilla.layout += [
+    "ipc/RemotePrintJobChild.h",
+    "ipc/RemotePrintJobParent.h",
+]
+
+EXPORTS.mozilla.layout.printing += ["DrawEventRecorder.h"]
+
+UNIFIED_SOURCES += [
+    "DrawEventRecorder.cpp",
+    "ipc/RemotePrintJobChild.cpp",
+    "ipc/RemotePrintJobParent.cpp",
+    "nsPagePrintTimer.cpp",
+    "nsPrintData.cpp",
+    "nsPrintJob.cpp",
+    "nsPrintObject.cpp",
+    "PrintTranslator.cpp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"
+LOCAL_INCLUDES += [
+    "../base",
+    "/dom/base",
+    "/gfx/2d/",
+    "/netwerk/base/",
+]
diff --git a/layout/printing/nsPagePrintTimer.cpp b/layout/printing/nsPagePrintTimer.cpp
new file mode 100644
index 0000000000..9afd5834b6
--- /dev/null
+++ b/layout/printing/nsPagePrintTimer.cpp
@@ -0,0 +1,221 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsPagePrintTimer.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/Unused.h"
+#include "nsPrintJob.h"
+#include "nsPrintObject.h"
+
+using namespace mozilla;
+
+NS_IMPL_ISUPPORTS_INHERITED(nsPagePrintTimer, mozilla::Runnable,
+                            nsITimerCallback)
+
+nsPagePrintTimer::nsPagePrintTimer(nsPrintJob* aPrintJob,
+                                   nsIDocumentViewerPrint* aDocViewerPrint,
+                                   mozilla::dom::Document* aDocument,
+                                   uint32_t aDelay)
+    : Runnable("nsPagePrintTimer"),
+      mPrintJob(aPrintJob),
+      mDocViewerPrint(aDocViewerPrint),
+      mDocument(aDocument),
+      mDelay(aDelay),
+      mFiringCount(0),
+      mPrintObj(nullptr),
+      mWatchDogCount(0),
+      mDone(false) {
+  MOZ_ASSERT(aDocViewerPrint && aDocument);
+  mDocViewerPrint->IncrementDestroyBlockedCount();
+}
+
+nsPagePrintTimer::~nsPagePrintTimer() { Disconnect(); }
+
+void nsPagePrintTimer::Disconnect() {
+  mPrintJob = nullptr;
+  mPrintObj = nullptr;
+  if (mDocViewerPrint) {
+    // This matches the IncrementDestroyBlockedCount call in the constructor.
+    mDocViewerPrint->DecrementDestroyBlockedCount();
+    mDocViewerPrint = nullptr;
+  }
+}
+
+nsresult nsPagePrintTimer::StartTimer(bool aUseDelay) {
+  uint32_t delay = 0;
+  if (aUseDelay) {
+    if (mFiringCount < 10) {
+      // Longer delay for the few first pages.
+      delay = mDelay + ((10 - mFiringCount) * 100);
+    } else {
+      delay = mDelay;
+    }
+  }
+  return NS_NewTimerWithCallback(
+      getter_AddRefs(mTimer), this, delay, nsITimer::TYPE_ONE_SHOT,
+      mDocument->EventTargetFor(TaskCategory::Other));
+}
+
+nsresult nsPagePrintTimer::StartWatchDogTimer() {
+  if (mWatchDogTimer) {
+    mWatchDogTimer->Cancel();
+  }
+  // Instead of just doing one timer for a long period do multiple so we
+  // can check if the user cancelled the printing.
+  return NS_NewTimerWithCallback(
+      getter_AddRefs(mWatchDogTimer), this, WATCH_DOG_INTERVAL,
+      nsITimer::TYPE_ONE_SHOT, mDocument->EventTargetFor(TaskCategory::Other));
+}
+
+void nsPagePrintTimer::StopWatchDogTimer() {
+  if (mWatchDogTimer) {
+    mWatchDogTimer->Cancel();
+    mWatchDogTimer = nullptr;
+  }
+}
+
+// nsRunnable
+NS_IMETHODIMP
+nsPagePrintTimer::Run() {
+  bool initNewTimer = true;
+  // Check to see if we are done
+  // inRange will be true if a sheet is actually printed
+  bool inRange;
+  bool donePrinting;
+
+  // donePrinting will be true if it completed successfully or
+  // if the printing was cancelled
+  donePrinting = !mPrintJob || mPrintJob->PrintSheet(mPrintObj, inRange);
+  if (donePrinting) {
+    if (mWaitingForRemotePrint ||
+        // If we are not waiting for the remote printing, it is the time to
+        // end printing task by calling DonePrintingSheets.
+        (!mPrintJob || mPrintJob->DonePrintingSheets(mPrintObj, NS_OK))) {
+      initNewTimer = false;
+      mDone = true;
+    }
+  }
+
+  // Note that the Stop() destroys this after the print job finishes
+  // (The nsPrintJob stops holding a reference when DonePrintingSheets
+  // returns true.)
+  Stop();
+  if (initNewTimer) {
+    ++mFiringCount;
+    nsresult result = StartTimer(inRange);
+    if (NS_FAILED(result)) {
+      mDone = true;  // had a failure.. we are finished..
+      if (mPrintJob) {
+        mPrintJob->SetIsPrinting(false);
+      }
+    }
+  }
+  return NS_OK;
+}
+
+// nsITimerCallback
+NS_IMETHODIMP
+nsPagePrintTimer::Notify(nsITimer* timer) {
+  // When finished there may be still pending notifications, which we can just
+  // ignore.
+  if (mDone) {
+    return NS_OK;
+  }
+
+  // There are four things that call Notify with different values for timer:
+  // 1) the delay between sheets (timer == mTimer)
+  // 2) canvasPrintState done (timer == null)
+  // 3) the watch dog timer (timer == mWatchDogTimer)
+  // 4) the waiting for remote print "timer" (timer == mWaitingForRemotePrint)
+  if (!timer) {
+    // Reset the counter since a mozPrintCallback has finished.
+    mWatchDogCount = 0;
+  } else if (timer == mTimer) {
+    // Reset the watchdog timer before the start of every sheet.
+    mWatchDogCount = 0;
+    mTimer = nullptr;
+  } else if (timer == mWaitingForRemotePrint) {
+    mWaitingForRemotePrint = nullptr;
+
+    // If we are still waiting for the sheet delay timer, don't let the
+    // notification from the remote print job trigger the next sheet.
+    if (mTimer) {
+      return NS_OK;
+    }
+  } else if (timer == mWatchDogTimer) {
+    mWatchDogCount++;
+    if (mWatchDogCount > WATCH_DOG_MAX_COUNT) {
+      Fail();
+      return NS_OK;
+    }
+  }
+
+  bool donePrePrint = true;
+  // Don't start to pre-print if we're waiting on the parent still.
+  if (mPrintJob && !mWaitingForRemotePrint) {
+    donePrePrint = mPrintJob->PrePrintSheet();
+  }
+
+  if (donePrePrint && !mWaitingForRemotePrint) {
+    StopWatchDogTimer();
+    // Pass nullptr here since name already was set in constructor.
+    mDocument->Dispatch(TaskCategory::Other, do_AddRef(this));
+  } else {
+    // Start the watch dog if we're waiting for preprint to ensure that if any
+    // mozPrintCallbacks take to long we error out.
+    StartWatchDogTimer();
+  }
+
+  return NS_OK;
+}
+
+void nsPagePrintTimer::WaitForRemotePrint() {
+  mWaitingForRemotePrint = NS_NewTimer();
+  if (!mWaitingForRemotePrint) {
+    NS_WARNING("Failed to wait for remote print, we might time-out.");
+  }
+}
+
+void nsPagePrintTimer::RemotePrintFinished() {
+  if (!mWaitingForRemotePrint) {
+    return;
+  }
+
+  // now clean up print or print the next webshell
+  if (mDone && mPrintJob) {
+    mDone = mPrintJob->DonePrintingSheets(mPrintObj, NS_OK);
+  }
+
+  mWaitingForRemotePrint->SetTarget(
+      mDocument->EventTargetFor(mozilla::TaskCategory::Other));
+  mozilla::Unused << mWaitingForRemotePrint->InitWithCallback(
+      this, 0, nsITimer::TYPE_ONE_SHOT);
+}
+
+nsresult nsPagePrintTimer::Start(nsPrintObject* aPO) {
+  mPrintObj = aPO;
+  mDone = false;
+  return StartTimer(false);
+}
+
+void nsPagePrintTimer::Stop() {
+  if (mTimer) {
+    mTimer->Cancel();
+    mTimer = nullptr;
+  }
+  StopWatchDogTimer();
+}
+
+void nsPagePrintTimer::Fail() {
+  NS_WARNING("nsPagePrintTimer::Fail called");
+
+  mDone = true;
+  Stop();
+  if (mPrintJob) {
+    mPrintJob->CleanupOnFailure(NS_OK, false);
+  }
+}
diff --git a/layout/printing/nsPagePrintTimer.h b/layout/printing/nsPagePrintTimer.h
new file mode 100644
index 0000000000..068d9fafb7
--- /dev/null
+++ b/layout/printing/nsPagePrintTimer.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsPagePrintTimer_h___
+#define nsPagePrintTimer_h___
+
+// Timer Includes
+#include "nsITimer.h"
+
+#include "nsIDocumentViewerPrint.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/OwningNonNull.h"
+#include "nsThreadUtils.h"
+
+class nsPrintJob;
+class nsPrintObject;
+
+namespace mozilla::dom {
+class Document;
+}
+
+//---------------------------------------------------
+//-- Page Timer Class
+//---------------------------------------------------
+// Strictly speaking, this actually manages the timing of printing *sheets*
+// (instances of "PrintedSheetFrame"), each of which may encompass multiple
+// pages (nsPageFrames) of the document. The use of "Page" in the class name
+// here is for historical / colloquial purposes.
+class nsPagePrintTimer final : public mozilla::Runnable,
+                               public nsITimerCallback {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  nsPagePrintTimer(nsPrintJob* aPrintJob,
+                   nsIDocumentViewerPrint* aDocViewerPrint,
+                   mozilla::dom::Document* aDocument, uint32_t aDelay);
+
+  NS_DECL_NSITIMERCALLBACK
+
+  nsresult Start(nsPrintObject* aPO);
+
+  NS_IMETHOD Run() override;
+
+  void Stop();
+
+  void WaitForRemotePrint();
+  void RemotePrintFinished();
+
+  void Disconnect();
+
+ private:
+  ~nsPagePrintTimer();
+
+  nsresult StartTimer(bool aUseDelay);
+  nsresult StartWatchDogTimer();
+  void StopWatchDogTimer();
+  void Fail();
+
+  nsPrintJob* mPrintJob;
+  nsCOMPtr<nsIDocumentViewerPrint> mDocViewerPrint;
+  RefPtr<mozilla::dom::Document> mDocument;
+  nsCOMPtr<nsITimer> mTimer;
+  nsCOMPtr<nsITimer> mWatchDogTimer;
+  nsCOMPtr<nsITimer> mWaitingForRemotePrint;
+  uint32_t mDelay;
+  uint32_t mFiringCount;
+  nsPrintObject* mPrintObj;
+  uint32_t mWatchDogCount;
+  bool mDone;
+
+  static const uint32_t WATCH_DOG_INTERVAL = 1000;
+  static const uint32_t WATCH_DOG_MAX_COUNT =
+#ifdef DEBUG
+      // Debug builds are very slow (on Mac at least) and can need extra time
+      30
+#else
+      10
+#endif
+      ;
+};
+
+#endif /* nsPagePrintTimer_h___ */
diff --git a/layout/printing/nsPrintData.cpp b/layout/printing/nsPrintData.cpp
new file mode 100644
index 0000000000..db09acae39
--- /dev/null
+++ b/layout/printing/nsPrintData.cpp
@@ -0,0 +1,126 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsPrintData.h"
+
+#include "mozilla/gfx/PrintPromise.h"
+#include "nsIStringBundle.h"
+#include "nsIWidget.h"
+#include "nsPrintObject.h"
+#include "nsIWebProgressListener.h"
+#include "mozilla/Services.h"
+
+//-----------------------------------------------------
+// PR LOGGING
+#include "mozilla/Logging.h"
+
+extern mozilla::LazyLogModule gPrintingLog;
+
+#define PR_PL(_p1) MOZ_LOG(gPrintingLog, mozilla::LogLevel::Debug, _p1);
+
+static void InformListenersOfProgressChange(
+    const nsCOMArray<nsIWebProgressListener>& aListeners, int32_t aProgress,
+    int32_t aMaxProgress, bool aDoStartStop, int32_t aFlag) {
+  size_t numberOfListeners = aListeners.Length();
+  for (size_t i = 0; i < numberOfListeners; ++i) {
+    nsCOMPtr<nsIWebProgressListener> listener = aListeners.SafeElementAt(i);
+    if (NS_WARN_IF(!listener)) {
+      continue;
+    }
+    listener->OnProgressChange(nullptr, nullptr, aProgress, aMaxProgress,
+                               aProgress, aMaxProgress);
+    if (aDoStartStop) {
+      listener->OnStateChange(nullptr, nullptr, aFlag, NS_OK);
+    }
+  }
+}
+
+static void InformListenersOfEndPrinting(
+    const nsCOMArray<nsIWebProgressListener>& aListeners) {
+  InformListenersOfProgressChange(
+      aListeners, 100, 100, true,
+      nsIWebProgressListener::STATE_STOP |
+          nsIWebProgressListener::STATE_IS_DOCUMENT);
+  InformListenersOfProgressChange(aListeners, 100, 100, true,
+                                  nsIWebProgressListener::STATE_STOP |
+                                      nsIWebProgressListener::STATE_IS_NETWORK);
+}
+
+//---------------------------------------------------
+//-- nsPrintData Class Impl
+//---------------------------------------------------
+nsPrintData::nsPrintData(ePrintDataType aType)
+    : mType(aType), mOnStartSent(false), mIsAborted(false) {}
+
+nsPrintData::~nsPrintData() {
+  // Two things need to be done:
+  // - Inform the listeners
+  // - End/Abort document
+  // Preview requires neither, so return early.
+  if (mType == eIsPrintPreview) {
+    return;
+  }
+
+  if (mPrintDC) {
+    PR_PL(("****************** End Document ************************\n"));
+    PR_PL(("\n"));
+    if (mPrintDC->IsCurrentlyPrintingDocument()) {
+      if (!mIsAborted) {
+        auto promise = mPrintDC->EndDocument();
+        if (mOnStartSent) {
+          promise->Then(mozilla::GetMainThreadSerialEventTarget(), __func__,
+                        [listeners = std::move(mPrintProgressListeners)](
+                            // We're in dtor, so capture listeners by move.
+                            const mozilla::gfx::PrintEndDocumentPromise::
+                                ResolveOrRejectValue&) {
+                          InformListenersOfEndPrinting(listeners);
+                        });
+        }
+        // Informing listeners asynchronously, or don't need to inform them, so
+        // return early.
+        return;
+      }
+      mPrintDC->AbortDocument();
+    }
+  }
+  if (mOnStartSent) {
+    // Synchronously notify the listeners.
+    OnEndPrinting();
+  }
+}
+
+void nsPrintData::OnStartPrinting() {
+  if (!mOnStartSent) {
+    InformListenersOfProgressChange(
+        mPrintProgressListeners, 0, 0, true,
+        nsIWebProgressListener::STATE_START |
+            nsIWebProgressListener::STATE_IS_DOCUMENT |
+            nsIWebProgressListener::STATE_IS_NETWORK);
+    mOnStartSent = true;
+  }
+}
+
+void nsPrintData::OnEndPrinting() {
+  InformListenersOfEndPrinting(mPrintProgressListeners);
+}
+
+void nsPrintData::DoOnProgressChange(int32_t aProgress, int32_t aMaxProgress,
+                                     bool aDoStartStop, int32_t aFlag) {
+  InformListenersOfProgressChange(mPrintProgressListeners, aProgress,
+                                  aMaxProgress, aDoStartStop, aFlag);
+}
+
+void nsPrintData::DoOnStatusChange(nsresult aStatus) {
+  size_t numberOfListeners = mPrintProgressListeners.Length();
+  for (size_t i = 0; i < numberOfListeners; ++i) {
+    nsCOMPtr<nsIWebProgressListener> listener =
+        mPrintProgressListeners.SafeElementAt(i);
+    if (NS_WARN_IF(!listener)) {
+      continue;
+    }
+    listener->OnStatusChange(nullptr, nullptr, aStatus, nullptr);
+  }
+}
diff --git a/layout/printing/nsPrintData.h b/layout/printing/nsPrintData.h
new file mode 100644
index 0000000000..5d308fc7af
--- /dev/null
+++ b/layout/printing/nsPrintData.h
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsPrintData_h___
+#define nsPrintData_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+
+// Interfaces
+#include "nsDeviceContext.h"
+#include "nsIPrintSettings.h"
+#include "nsISupportsImpl.h"
+#include "nsCOMArray.h"
+
+class nsPrintObject;
+class nsIWebProgressListener;
+
+class nsPrintData {
+ public:
+  typedef enum { eIsPrinting, eIsPrintPreview } ePrintDataType;
+
+  explicit nsPrintData(ePrintDataType aType);
+
+  NS_INLINE_DECL_REFCOUNTING(nsPrintData)
+
+  // Listener Helper Methods
+  void OnEndPrinting();
+  void OnStartPrinting();
+  void DoOnProgressChange(int32_t aProgress, int32_t aMaxProgress,
+                          bool aDoStartStop, int32_t aFlag);
+
+  void DoOnStatusChange(nsresult aStatus);
+
+  ePrintDataType mType;  // the type of data this is (Printing or Print Preview)
+  RefPtr<nsDeviceContext> mPrintDC;
+
+  nsCOMArray<nsIWebProgressListener> mPrintProgressListeners;
+
+  bool mOnStartSent;
+  bool mIsAborted;  // tells us the document is being aborted
+
+ private:
+  nsPrintData() = delete;
+  nsPrintData& operator=(const nsPrintData& aOther) = delete;
+
+  ~nsPrintData();  // non-virtual
+};
+
+#endif /* nsPrintData_h___ */
diff --git a/layout/printing/nsPrintJob.cpp b/layout/printing/nsPrintJob.cpp
new file mode 100644
index 0000000000..ac4718860f
--- /dev/null
+++ b/layout/printing/nsPrintJob.cpp
@@ -0,0 +1,2436 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsPrintJob.h"
+
+#include "nsDebug.h"
+#include "nsDocShell.h"
+#include "nsReadableUtils.h"
+#include "nsQueryObject.h"
+
+#include "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/ComputedStyleInlines.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/PBrowser.h"
+#include "mozilla/dom/Selection.h"
+#include "mozilla/dom/ShadowRoot.h"
+#include "mozilla/dom/CustomEvent.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/IntegerRange.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/PresShellInlines.h"
+#include "mozilla/StaticPrefs_print.h"
+#include "mozilla/Telemetry.h"
+#include "nsIBrowserChild.h"
+#include "nsIOService.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsIStringBundle.h"
+#include "nsPIDOMWindow.h"
+#include "nsPrintData.h"
+#include "nsPrintObject.h"
+#include "nsIDocShell.h"
+#include "nsIURI.h"
+#include "nsITextToSubURI.h"
+#include "nsError.h"
+
+#include "nsView.h"
+#include <algorithm>
+
+// Print Options
+#include "nsIPrintSettings.h"
+#include "nsIPrintSettingsService.h"
+#include "nsGkAtoms.h"
+#include "nsXPCOM.h"
+
+static const char sPrintSettingsServiceContractID[] =
+    "@mozilla.org/gfx/printsettings-service;1";
+
+// Printing Timer
+#include "nsPagePrintTimer.h"
+
+// FrameSet
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DocumentInlines.h"
+
+// Misc
+#include "gfxContext.h"
+#include "mozilla/gfx/DrawEventRecorder.h"
+#include "mozilla/layout/RemotePrintJobChild.h"
+#include "nsISupportsUtils.h"
+#include "nsIScriptContext.h"
+#include "nsComponentManagerUtils.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/PresShell.h"
+#include "Text.h"
+
+#include "nsIDeviceContextSpec.h"
+#include "nsDeviceContextSpecProxy.h"
+#include "nsViewManager.h"
+
+#include "nsPageSequenceFrame.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIWebBrowserChrome.h"
+#include "mozilla/ReflowInput.h"
+#include "nsIContentViewer.h"
+#include "nsIDocumentViewerPrint.h"
+
+#include "nsFocusManager.h"
+#include "nsRange.h"
+#include "mozilla/Components.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLFrameElement.h"
+#include "mozilla/ServoStyleSet.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+//-----------------------------------------------------
+// PR LOGGING
+#include "mozilla/Logging.h"
+
+#ifdef DEBUG
+// PR_LOGGING is force to always be on (even in release builds)
+// but we only want some of it on,
+// #define EXTENDED_DEBUG_PRINTING
+#endif
+
+// this log level turns on the dumping of each document's layout info
+#define DUMP_LAYOUT_LEVEL (static_cast<mozilla::LogLevel>(9))
+
+#ifndef PR_PL
+static mozilla::LazyLogModule gPrintingLog("printing");
+
+#  define PR_PL(_p1) MOZ_LOG(gPrintingLog, mozilla::LogLevel::Debug, _p1);
+#endif
+
+#ifdef EXTENDED_DEBUG_PRINTING
+static uint32_t gDumpFileNameCnt = 0;
+static uint32_t gDumpLOFileNameCnt = 0;
+#endif
+
+#define PRT_YESNO(_p) ((_p) ? "YES" : "NO")
+
+inline const char* LoggableTypeOfPO(const nsPrintObject* aPO) {
+  // TODO(dholbert): These strings used to represent actual enum values, but
+  // the enum type has been removed. We could replace them with more
+  // descriptive names, if anyone uses this logging and cares to do so.
+  return aPO->mParent ? "eIFrame" : "eDoc";
+}
+
+inline const char* ShortLoggableTypeOfPO(const nsPrintObject* aPO) {
+  return aPO->mParent ? "IF" : "DC";
+}
+
+// This processes the selection on aOrigDoc and creates an inverted selection on
+// aDoc, which it then deletes. If the start or end of the inverted selection
+// ranges occur in text nodes then an ellipsis is added.
+static nsresult DeleteNonSelectedNodes(Document& aDoc);
+
+#ifdef EXTENDED_DEBUG_PRINTING
+// Forward Declarations
+static void DumpPrintObjectsListStart(const char* aStr,
+                                      const nsTArray<nsPrintObject*>& aDocList);
+static void DumpPrintObjectsTree(nsPrintObject* aPO, int aLevel = 0,
+                                 FILE* aFD = nullptr);
+static void DumpPrintObjectsTreeLayout(const UniquePtr<nsPrintObject>& aPO,
+                                       nsDeviceContext* aDC, int aLevel = 0,
+                                       FILE* aFD = nullptr);
+
+#  define DUMP_DOC_LIST(_title) \
+    DumpPrintObjectsListStart((_title), mPrintDocList);
+#  define DUMP_DOC_TREE DumpPrintObjectsTree(mPrintObject.get());
+#  define DUMP_DOC_TREELAYOUT \
+    DumpPrintObjectsTreeLayout(mPrintObject, mPrt->mPrintDC);
+#else
+#  define DUMP_DOC_LIST(_title)
+#  define DUMP_DOC_TREE
+#  define DUMP_DOC_TREELAYOUT
+#endif
+
+// -------------------------------------------------------
+// Helpers
+// -------------------------------------------------------
+
+/**
+ * Build a tree of nsPrintObjects under aPO. It also appends a (depth first)
+ * flat list of all the nsPrintObjects created to mPrintDocList. If
+ * one of the nsPrintObject's document is the focused document, then the print
+ * object is set as mSelectionRoot.
+ * @param aParentPO The parent nsPrintObject to populate, must not be null.
+ */
+void nsPrintJob::BuildNestedPrintObjects(
+    const UniquePtr<nsPrintObject>& aParentPO) {
+  MOZ_ASSERT(aParentPO);
+
+  // If aParentPO is for an iframe and its original document was the document
+  // that had focus then always set as the selection root.
+  if (aParentPO->mParent &&
+      aParentPO->mDocument->GetProperty(nsGkAtoms::printisfocuseddoc)) {
+    mSelectionRoot = aParentPO.get();
+  } else if (!mSelectionRoot && aParentPO->HasSelection()) {
+    // If there is no focused iframe but there is a selection in one or more
+    // frames then we want to set the root nsPrintObject as the focus root so
+    // that later EnablePrintingSelectionOnly can search for and enable all
+    // nsPrintObjects containing selections.
+    mSelectionRoot = mPrintObject.get();
+  }
+
+  for (auto& bc : aParentPO->mDocShell->GetBrowsingContext()->Children()) {
+    nsCOMPtr<nsIDocShell> docShell = bc->GetDocShell();
+    if (!docShell) {
+      if (auto* cc = dom::ContentChild::GetSingleton()) {
+        nsCOMPtr<nsIPrintSettingsService> printSettingsService =
+            do_GetService(sPrintSettingsServiceContractID);
+        embedding::PrintData printData;
+        printSettingsService->SerializeToPrintData(mPrintSettings, &printData);
+        Unused << cc->SendUpdateRemotePrintSettings(bc, printData);
+      }
+      continue;
+    }
+
+    RefPtr<Document> doc = docShell->GetDocument();
+    MOZ_DIAGNOSTIC_ASSERT(doc);
+    // We might find non-static documents here if the fission remoteness change
+    // hasn't happened / finished yet. In that case, just skip them, the same
+    // way we do for remote frames above.
+    MOZ_DIAGNOSTIC_ASSERT(doc->IsStaticDocument() || doc->IsInitialDocument());
+    if (!doc || !doc->IsStaticDocument()) {
+      continue;
+    }
+
+    // Note: docShell and doc are known-non-null at this point; they've been
+    // null-checked above (with null leading to 'continue' statements).
+    auto childPO = MakeUnique<nsPrintObject>(*docShell, *doc, aParentPO.get());
+
+    mPrintDocList.AppendElement(childPO.get());
+    BuildNestedPrintObjects(childPO);
+    aParentPO->mKids.AppendElement(std::move(childPO));
+  }
+}
+
+static nsresult GetDefaultPrintSettings(nsIPrintSettings** aSettings) {
+  *aSettings = nullptr;
+
+  nsresult rv = NS_ERROR_FAILURE;
+  nsCOMPtr<nsIPrintSettingsService> printSettingsService =
+      do_GetService(sPrintSettingsServiceContractID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return printSettingsService->GetDefaultPrintSettingsForPrinting(aSettings);
+}
+
+//-------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(nsPrintJob, nsIWebProgressListener, nsISupportsWeakReference)
+
+//-------------------------------------------------------
+nsPrintJob::~nsPrintJob() {
+  Destroy();  // for insurance
+  DisconnectPagePrintTimer();
+}
+
+bool nsPrintJob::CheckBeforeDestroy() const { return mPreparingForPrint; }
+
+//-------------------------------------------------------
+void nsPrintJob::Destroy() {
+  if (mIsDestroying) {
+    return;
+  }
+  mIsDestroying = true;
+
+  DestroyPrintingData();
+
+  mDocViewerPrint = nullptr;
+}
+
+//-------------------------------------------------------
+void nsPrintJob::DestroyPrintingData() {
+  mPrintObject = nullptr;
+  mPrt = nullptr;
+}
+
+nsPrintJob::nsPrintJob(nsIDocumentViewerPrint& aDocViewerPrint,
+                       nsIDocShell& aDocShell, Document& aOriginalDoc,
+                       float aScreenDPI)
+    : mDocViewerPrint(&aDocViewerPrint),
+      mDocShell(do_GetWeakReference(&aDocShell)),
+      mScreenDPI(aScreenDPI) {
+  // Any state that we need from aOriginalDoc must be fetched and stored
+  // here, since the document that the user selected to print may mutate
+  // across consecutive PrintPreview() calls.
+
+  Element* root = aOriginalDoc.GetRootElement();
+  mDisallowSelectionPrint =
+      root &&
+      root->HasAttr(kNameSpaceID_None, nsGkAtoms::mozdisallowselectionprint);
+}
+
+//-----------------------------------------------------------------
+std::tuple<nsPageSequenceFrame*, int32_t>
+nsPrintJob::GetSeqFrameAndCountSheets() const {
+  if (NS_WARN_IF(!mPrt)) {
+    return {nullptr, 0};
+  }
+
+  const nsPrintObject* po = mPrintObject.get();
+  if (NS_WARN_IF(!po)) {
+    return {nullptr, 0};
+  }
+
+  // This is sometimes incorrectly called before the pres shell has been created
+  // (bug 1141756). MOZ_DIAGNOSTIC_ASSERT so we'll still see the crash in
+  // Nightly/Aurora in case the other patch fixes this.
+  if (!po->mPresShell) {
+    MOZ_DIAGNOSTIC_ASSERT(
+        false, "GetSeqFrameAndCountSheets needs a non-null pres shell");
+    return {nullptr, 0};
+  }
+
+  nsPageSequenceFrame* seqFrame = po->mPresShell->GetPageSequenceFrame();
+  if (!seqFrame) {
+    return {nullptr, 0};
+  }
+
+  // count the total number of sheets
+  return {seqFrame, seqFrame->PrincipalChildList().GetLength()};
+}
+
+// Foward decl for Debug Helper Functions
+#ifdef EXTENDED_DEBUG_PRINTING
+#  ifdef XP_WIN
+static int RemoveFilesInDir(const char* aDir);
+#  endif
+static void GetDocTitleAndURL(const UniquePtr<nsPrintObject>& aPO,
+                              nsACString& aDocStr, nsACString& aURLStr);
+static void DumpPrintObjectsTree(nsPrintObject* aPO, int aLevel, FILE* aFD);
+static void DumpPrintObjectsList(const nsTArray<nsPrintObject*>& aDocList);
+static void RootFrameList(nsPresContext* aPresContext, FILE* out,
+                          const char* aPrefix);
+static void DumpViews(nsIDocShell* aDocShell, FILE* out);
+static void DumpLayoutData(const char* aTitleStr, const char* aURLStr,
+                           nsPresContext* aPresContext, nsDeviceContext* aDC,
+                           nsIFrame* aRootFrame, nsIDocShell* aDocShell,
+                           FILE* aFD);
+#endif
+
+//--------------------------------------------------------------------------------
+
+nsresult nsPrintJob::CommonPrint(bool aIsPrintPreview,
+                                 nsIPrintSettings* aPrintSettings,
+                                 nsIWebProgressListener* aWebProgressListener,
+                                 Document& aSourceDoc) {
+  // Callers must hold a strong reference to |this| to ensure that we stay
+  // alive for the duration of this method, because our main owning reference
+  // (on nsDocumentViewer) might be cleared during this function (if we cause
+  // script to run and it cancels the print operation).
+
+  nsresult rv = DoCommonPrint(aIsPrintPreview, aPrintSettings,
+                              aWebProgressListener, aSourceDoc);
+  if (NS_FAILED(rv)) {
+    if (aIsPrintPreview) {
+      mIsCreatingPrintPreview = false;
+      SetIsPrintPreview(false);
+    } else {
+      SetIsPrinting(false);
+    }
+    if (rv != NS_ERROR_ABORT && rv != NS_ERROR_OUT_OF_MEMORY) {
+      FirePrintingErrorEvent(rv);
+    }
+    DestroyPrintingData();
+  }
+
+  return rv;
+}
+
+nsresult nsPrintJob::DoCommonPrint(bool aIsPrintPreview,
+                                   nsIPrintSettings* aPrintSettings,
+                                   nsIWebProgressListener* aWebProgressListener,
+                                   Document& aDoc) {
+  MOZ_ASSERT(aDoc.IsStaticDocument());
+
+  nsresult rv;
+
+  // Grab the new instance with local variable to guarantee that it won't be
+  // deleted during this method.
+  // Note: Methods we call early below rely on mPrt being set.
+  mPrt = new nsPrintData(aIsPrintPreview ? nsPrintData::eIsPrintPreview
+                                         : nsPrintData::eIsPrinting);
+  RefPtr<nsPrintData> printData = mPrt;
+
+  if (aIsPrintPreview) {
+    mIsCreatingPrintPreview = true;
+    SetIsPrintPreview(true);
+  } else {
+    SetIsPrinting(true);
+  }
+
+  if (aWebProgressListener) {
+    printData->mPrintProgressListeners.AppendObject(aWebProgressListener);
+  }
+  if (mRemotePrintJob) {
+    // If we have a RemotePrintJob add it to the print progress listeners,
+    // so it can forward to the parent.
+    printData->mPrintProgressListeners.AppendElement(mRemotePrintJob);
+  }
+
+  // Get the docshell for this documentviewer
+  nsCOMPtr<nsIDocShell> docShell(do_QueryReferent(mDocShell, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // if they don't pass in a PrintSettings, then get the Global PS
+  mPrintSettings = aPrintSettings;
+  if (!mPrintSettings) {
+    MOZ_TRY(GetDefaultPrintSettings(getter_AddRefs(mPrintSettings)));
+  }
+
+  {
+    nsAutoScriptBlocker scriptBlocker;
+    // Note: docShell is implicitly non-null via do_QueryReferent necessarily
+    // having succeeded (if we got here).
+    mPrintObject = MakeUnique<nsPrintObject>(*docShell, aDoc);
+    mPrintDocList.AppendElement(mPrintObject.get());
+
+    BuildNestedPrintObjects(mPrintObject);
+  }
+
+  // The nsAutoScriptBlocker above will now have been destroyed, which may
+  // cause our print/print-preview operation to finish. In this case, we
+  // should immediately return an error code so that the root caller knows
+  // it shouldn't continue to do anything with this instance.
+  if (mIsDestroying) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // XXX This isn't really correct...
+  if (!mPrintObject->mDocument || !mPrintObject->mDocument->GetRootElement())
+    return NS_ERROR_GFX_PRINTER_STARTDOC;
+
+  mPrintSettings->GetShrinkToFit(&mShrinkToFit);
+
+  nsCOMPtr<nsIDeviceContextSpec> devspec;
+  if (XRE_IsContentProcess()) {
+    devspec = new nsDeviceContextSpecProxy(mRemotePrintJob);
+  } else {
+    devspec = do_CreateInstance("@mozilla.org/gfx/devicecontextspec;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  bool printSilently = false;
+  mPrintSettings->GetPrintSilent(&printSilently);
+  if (StaticPrefs::print_always_print_silent()) {
+    printSilently = true;
+  }
+
+  if (mIsDoingPrinting && printSilently) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_SILENT_PRINT, 1);
+  }
+
+  MOZ_TRY(devspec->Init(mPrintSettings, mIsCreatingPrintPreview));
+
+  printData->mPrintDC = new nsDeviceContext();
+  MOZ_TRY(printData->mPrintDC->InitForPrinting(devspec));
+
+  MOZ_TRY(EnablePOsForPrinting());
+
+  if (!mIsCreatingPrintPreview) {
+    printData->OnStartPrinting();
+  }
+  InitPrintDocConstruction(false);
+
+  return NS_OK;
+}
+
+//---------------------------------------------------------------------------------
+nsresult nsPrintJob::Print(Document& aDoc, nsIPrintSettings* aPrintSettings,
+                           RemotePrintJobChild* aRemotePrintJob,
+                           nsIWebProgressListener* aWebProgressListener) {
+  mRemotePrintJob = aRemotePrintJob;
+  return CommonPrint(false, aPrintSettings, aWebProgressListener, aDoc);
+}
+
+nsresult nsPrintJob::PrintPreview(Document& aDoc,
+                                  nsIPrintSettings* aPrintSettings,
+                                  nsIWebProgressListener* aWebProgressListener,
+                                  PrintPreviewResolver&& aCallback) {
+  // Take ownership of aCallback, otherwise a function further up the call
+  // stack will call it to signal failure (by passing zero).
+  mPrintPreviewCallback = std::move(aCallback);
+
+  nsresult rv = CommonPrint(true, aPrintSettings, aWebProgressListener, aDoc);
+  if (NS_FAILED(rv)) {
+    if (mPrintPreviewCallback) {
+      // signal error
+      mPrintPreviewCallback(
+          PrintPreviewResultInfo(0, 0, false, false, false, {}, {}, {}));
+      mPrintPreviewCallback = nullptr;
+    }
+  }
+  return rv;
+}
+
+int32_t nsPrintJob::GetRawNumPages() const {
+  auto [seqFrame, numSheets] = GetSeqFrameAndCountSheets();
+  Unused << numSheets;
+  return seqFrame ? seqFrame->GetRawNumPages() : 0;
+}
+
+bool nsPrintJob::GetIsEmpty() const {
+  auto [seqFrame, numSheets] = GetSeqFrameAndCountSheets();
+  if (!seqFrame) {
+    return true;
+  }
+  if (numSheets > 1) {
+    return false;
+  }
+  return !seqFrame->GetPagesInFirstSheet();
+}
+
+int32_t nsPrintJob::GetPrintPreviewNumSheets() const {
+  auto [seqFrame, numSheets] = GetSeqFrameAndCountSheets();
+  Unused << seqFrame;
+  return numSheets;
+}
+
+//-----------------------------------------------------------------
+//-- Section: Pre-Reflow Methods
+//-----------------------------------------------------------------
+
+// static
+void nsPrintJob::GetDisplayTitleAndURL(Document& aDoc,
+                                       nsIPrintSettings* aSettings,
+                                       DocTitleDefault aTitleDefault,
+                                       nsAString& aTitle, nsAString& aURLStr) {
+  aTitle.Truncate();
+  aURLStr.Truncate();
+
+  if (aSettings) {
+    aSettings->GetTitle(aTitle);
+    aSettings->GetDocURL(aURLStr);
+  }
+
+  if (aTitle.IsEmpty()) {
+    aDoc.GetTitle(aTitle);
+    if (aTitle.IsEmpty()) {
+      if (!aURLStr.IsEmpty() &&
+          aTitleDefault == DocTitleDefault::eDocURLElseFallback) {
+        aTitle = aURLStr;
+      } else {
+        nsCOMPtr<nsIStringBundle> brandBundle;
+        nsCOMPtr<nsIStringBundleService> svc =
+            mozilla::components::StringBundle::Service();
+        if (svc) {
+          svc->CreateBundle("chrome://branding/locale/brand.properties",
+                            getter_AddRefs(brandBundle));
+          if (brandBundle) {
+            brandBundle->GetStringFromName("brandShortName", aTitle);
+          }
+        }
+        if (aTitle.IsEmpty()) {
+          aTitle.AssignLiteral(u"Mozilla Document");
+        }
+      }
+    }
+  }
+
+  if (aURLStr.IsEmpty()) {
+    nsIURI* url = aDoc.GetDocumentURI();
+    if (!url) {
+      return;
+    }
+
+    nsCOMPtr<nsIURI> exposableURI = net::nsIOService::CreateExposableURI(url);
+    nsAutoCString urlCStr;
+    nsresult rv = exposableURI->GetSpec(urlCStr);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+
+    nsCOMPtr<nsITextToSubURI> textToSubURI =
+        do_GetService(NS_ITEXTTOSUBURI_CONTRACTID, &rv);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+
+    textToSubURI->UnEscapeURIForUI(urlCStr, aURLStr);
+  }
+}
+
+//---------------------------------------------------------------------
+nsresult nsPrintJob::DocumentReadyForPrinting() {
+  // Send the document to the printer...
+  nsresult rv = SetupToPrintContent();
+  if (NS_FAILED(rv)) {
+    // The print job was canceled or there was a problem
+    // So remove all other documents from the print list
+    DonePrintingSheets(nullptr, rv);
+  }
+  return rv;
+}
+
+/** ---------------------------------------------------
+ *  Cleans up when an error occurred
+ */
+nsresult nsPrintJob::CleanupOnFailure(nsresult aResult, bool aIsPrinting) {
+  PR_PL(("****  Failed %s - rv 0x%" PRIX32,
+         aIsPrinting ? "Printing" : "Print Preview",
+         static_cast<uint32_t>(aResult)));
+
+  /* cleanup... */
+  if (mPagePrintTimer) {
+    mPagePrintTimer->Stop();
+    DisconnectPagePrintTimer();
+  }
+
+  if (aIsPrinting) {
+    SetIsPrinting(false);
+  } else {
+    SetIsPrintPreview(false);
+    mIsCreatingPrintPreview = false;
+  }
+
+  /* cleanup done, let's fire-up an error dialog to notify the user
+   * what went wrong...
+   *
+   * When rv == NS_ERROR_ABORT, it means we want out of the
+   * print job without displaying any error messages
+   */
+  if (aResult != NS_ERROR_ABORT) {
+    FirePrintingErrorEvent(aResult);
+  }
+
+  FirePrintCompletionEvent();
+
+  return aResult;
+}
+
+//---------------------------------------------------------------------
+void nsPrintJob::FirePrintingErrorEvent(nsresult aPrintError) {
+  if (mPrintPreviewCallback) {
+    // signal error
+    mPrintPreviewCallback(
+        PrintPreviewResultInfo(0, 0, false, false, false, {}, {}, {}));
+    mPrintPreviewCallback = nullptr;
+  }
+
+  nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint);
+  if (NS_WARN_IF(!cv)) {
+    return;
+  }
+
+  const RefPtr<Document> doc = cv->GetDocument();
+  const RefPtr<CustomEvent> event = NS_NewDOMCustomEvent(doc, nullptr, nullptr);
+
+  MOZ_ASSERT(event);
+
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(event->GetParentObject())) {
+    return;
+  }
+  JSContext* cx = jsapi.cx();
+
+  JS::Rooted<JS::Value> detail(
+      cx, JS::NumberValue(static_cast<double>(aPrintError)));
+  event->InitCustomEvent(cx, u"PrintingError"_ns, false, false, detail);
+  event->SetTrusted(true);
+
+  // Event listeners in chrome shouldn't delete this.
+  AsyncEventDispatcher::RunDOMEventWhenSafe(*doc, *event,
+                                            ChromeOnlyDispatch::eYes);
+
+  // Inform any progress listeners of the Error.
+  if (mPrt) {
+    // Note that nsPrintData::DoOnStatusChange() will call some listeners.
+    // So, mPrt can be cleared or recreated.
+    RefPtr<nsPrintData> printData = mPrt;
+    printData->DoOnStatusChange(aPrintError);
+  }
+}
+
+//-----------------------------------------------------------------
+//-- Section: Reflow Methods
+//-----------------------------------------------------------------
+
+nsresult nsPrintJob::ReconstructAndReflow() {
+  if (NS_WARN_IF(!mPrt)) {
+    return NS_ERROR_FAILURE;
+  }
+
+#if defined(XP_WIN) && defined(EXTENDED_DEBUG_PRINTING)
+  // We need to clear all the output files here
+  // because they will be re-created with second reflow of the docs
+  if (MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    RemoveFilesInDir(".\\");
+    gDumpFileNameCnt = 0;
+    gDumpLOFileNameCnt = 0;
+  }
+#endif
+
+  // In this loop, it's conceivable that one of our helpers might clear mPrt,
+  // while we're using it & its members!  So we capture it in an owning local
+  // reference & use that instead of using mPrt directly.
+  RefPtr<nsPrintData> printData = mPrt;
+  for (nsPrintObject* po : mPrintDocList) {
+    if (!po->PrintingIsEnabled() || po->mInvisible) {
+      continue;
+    }
+
+    // When the print object has been marked as "print the document" (i.e,
+    // po->PrintingIsEnabled() is true), mPresContext and mPresShell should be
+    // non-nullptr (i.e., should've been created for the print) since they
+    // are necessary to print the document.
+    MOZ_ASSERT(po->mPresContext && po->mPresShell,
+               "mPresContext and mPresShell shouldn't be nullptr when the "
+               "print object "
+               "has been marked as \"print the document\"");
+
+    UpdateZoomRatio(po);
+
+    po->mPresContext->SetPageScale(po->mZoomRatio);
+
+    // Calculate scale factor from printer to screen
+    float printDPI = float(AppUnitsPerCSSInch()) /
+                     float(printData->mPrintDC->AppUnitsPerDevPixel());
+    po->mPresContext->SetPrintPreviewScale(mScreenDPI / printDPI);
+
+    RefPtr<PresShell> presShell(po->mPresShell);
+    if (NS_WARN_IF(presShell->IsDestroying())) {
+      return NS_ERROR_FAILURE;
+    }
+
+    presShell->ReconstructFrames();
+
+    // If the printing was canceled or restarted with different data,
+    // let's stop doing this printing.
+    if (NS_WARN_IF(mPrt != printData)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    // For all views except the first one, setup the root view.
+    // ??? Can there be multiple po for the top-level-document?
+    bool documentIsTopLevel = true;
+    if (po->mParent) {
+      nsSize adjSize;
+      bool doReturn;
+      nsresult rv = SetRootView(po, doReturn, documentIsTopLevel, adjSize);
+
+      MOZ_ASSERT(!documentIsTopLevel, "How could this happen?");
+
+      if (NS_FAILED(rv) || doReturn) {
+        return rv;
+      }
+    }
+
+    presShell->FlushPendingNotifications(FlushType::Layout);
+
+    if (NS_WARN_IF(presShell->IsDestroying())) {
+      return NS_ERROR_FAILURE;
+    }
+
+    // If the printing was canceled or restarted with different data,
+    // let's stop doing this printing.
+    if (NS_WARN_IF(mPrt != printData)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = UpdateSelectionAndShrinkPrintObject(po, documentIsTopLevel);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  return NS_OK;
+}
+
+//-------------------------------------------------------
+nsresult nsPrintJob::SetupToPrintContent() {
+  // This method may be called while DoCommonPrint() initializes the instance
+  // when its script blocker goes out of scope.  In such case, this cannot do
+  // its job as expected because some objects in mPrt have not been initialized
+  // yet but they are necessary.
+  // Note: it shouldn't be possible for mPrintObject to be null; we check
+  // it for good measure (after we check its owner) before we start
+  // dereferencing it below.
+  if (NS_WARN_IF(!mPrt) || NS_WARN_IF(!mPrintObject)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // If this is creating print preview, mPrintObject->mPresContext and
+  // mPrintObject->mPresShell need to be non-nullptr because this cannot
+  // initialize page sequence frame without them at end of this method since
+  // page sequence frame has already been destroyed or not been created yet.
+  if (mIsCreatingPrintPreview && (NS_WARN_IF(!mPrintObject->mPresContext) ||
+                                  NS_WARN_IF(!mPrintObject->mPresShell))) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // If this is printing some documents (not print-previewing the documents),
+  // mPrintObject->mPresContext and mPrintObject->mPresShell can be
+  // nullptr only when mPrintObject->PrintingIsEnabled() is false.  E.g.,
+  // if the document has a <frameset> element and it's printing only content in
+  // a <frame> element or all <frame> elements separately.
+  MOZ_ASSERT(
+      (!mIsCreatingPrintPreview && !mPrintObject->PrintingIsEnabled()) ||
+          (mPrintObject->mPresContext && mPrintObject->mPresShell),
+      "mPresContext and mPresShell shouldn't be nullptr when printing the "
+      "document or creating print-preview");
+
+  bool didReconstruction = false;
+
+  // This method works with mPrintObject.  So, we need to guarantee that
+  // it won't be deleted in this method.  We achieve this by holding a strong
+  // local reference to mPrt, which in turn keeps mPrintObject alive.
+  RefPtr<nsPrintData> printData = mPrt;
+
+  // If some new content got loaded since the initial reflow rebuild
+  // everything.
+  if (mDidLoadDataForPrinting) {
+    nsresult rv = ReconstructAndReflow();
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    // If the printing was canceled or restarted with different data,
+    // let's stop doing this printing.
+    if (NS_WARN_IF(mPrt != printData)) {
+      return NS_ERROR_FAILURE;
+    }
+    didReconstruction = true;
+  }
+
+  // Here is where we figure out if extra reflow for shrinking the content
+  // is required.
+  if (mShrinkToFit) {
+    mShrinkToFitFactor = mPrintObject->mShrinkRatio;
+
+    if (mShrinkToFitFactor < 0.998f) {
+      nsresult rv = ReconstructAndReflow();
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      // If the printing was canceled or restarted with different data,
+      // let's stop doing this printing.
+      if (NS_WARN_IF(mPrt != printData)) {
+        return NS_ERROR_FAILURE;
+      }
+      didReconstruction = true;
+    }
+
+    if (MOZ_LOG_TEST(gPrintingLog, LogLevel::Debug)) {
+      float calcRatio = mPrintObject->mShrinkRatio;
+      PR_PL(
+          ("*******************************************************************"
+           "*******\n"));
+      PR_PL(("STF Ratio is: %8.5f Effective Ratio: %8.5f Diff: %8.5f\n",
+             mShrinkToFitFactor, calcRatio, mShrinkToFitFactor - calcRatio));
+      PR_PL(
+          ("*******************************************************************"
+           "*******\n"));
+    }
+  }
+
+  // If the frames got reconstructed and reflowed the number of pages might
+  // has changed.
+  if (didReconstruction) {
+    FirePrintPreviewUpdateEvent();
+    // If the printing was canceled or restarted with different data,
+    // let's stop doing this printing.
+    if (NS_WARN_IF(mPrt != printData)) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  DUMP_DOC_LIST(("\nAfter Reflow------------------------------------------"));
+  PR_PL(("\n"));
+  PR_PL(("-------------------------------------------------------\n"));
+  PR_PL(("\n"));
+
+  CalcNumPrintablePages(mNumPrintablePages);
+
+  PR_PL(("--- Printing %d pages\n", mNumPrintablePages));
+  DUMP_DOC_TREELAYOUT;
+
+  // Print listener setup...
+  printData->OnStartPrinting();
+
+  // If the printing was canceled or restarted with different data,
+  // let's stop doing this printing.
+  if (NS_WARN_IF(mPrt != printData)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAutoString fileNameStr;
+  // check to see if we are printing to a file
+  if (mPrintSettings->GetOutputDestination() ==
+      nsIPrintSettings::kOutputDestinationFile) {
+    // On some platforms the BeginDocument needs to know the name of the file.
+    mPrintSettings->GetToFileName(fileNameStr);
+  }
+
+  nsAutoString docTitleStr;
+  nsAutoString docURLStr;
+  GetDisplayTitleAndURL(*mPrintObject->mDocument, mPrintSettings,
+                        DocTitleDefault::eDocURLElseFallback, docTitleStr,
+                        docURLStr);
+
+  int32_t startPage = 1;
+  int32_t endPage = mNumPrintablePages;
+
+  nsTArray<int32_t> ranges;
+  mPrintSettings->GetPageRanges(ranges);
+  for (size_t i = 0; i < ranges.Length(); i += 2) {
+    startPage = std::max(1, std::min(startPage, ranges[i]));
+    endPage = std::min(mNumPrintablePages, std::max(endPage, ranges[i + 1]));
+  }
+
+  nsresult rv = NS_OK;
+  // BeginDocument may pass back a FAILURE code
+  // i.e. On Windows, if you are printing to a file and hit "Cancel"
+  //      to the "File Name" dialog, this comes back as an error
+  // Don't start printing when regression test are executed
+  if (mIsDoingPrinting) {
+    rv = printData->mPrintDC->BeginDocument(docTitleStr, fileNameStr, startPage,
+                                            endPage);
+  }
+
+  if (mIsCreatingPrintPreview) {
+    // Copy docTitleStr and docURLStr to the pageSequenceFrame, to be displayed
+    // in the header
+    nsPageSequenceFrame* seqFrame =
+        mPrintObject->mPresShell->GetPageSequenceFrame();
+    if (seqFrame) {
+      seqFrame->StartPrint(mPrintObject->mPresContext, mPrintSettings,
+                           docTitleStr, docURLStr);
+    }
+  }
+
+  PR_PL(("****************** Begin Document ************************\n"));
+
+  if (NS_FAILED(rv)) {
+    NS_WARNING_ASSERTION(rv == NS_ERROR_ABORT,
+                         "Failed to begin document for printing");
+    return rv;
+  }
+
+  // This will print the docshell document
+  // when it completes asynchronously in the DonePrintingSheets method
+  // it will check to see if there are more docshells to be printed and
+  // then PrintDocContent will be called again.
+
+  if (mIsDoingPrinting) {
+    // Double-check that mPrintObject is non-null, because it could have
+    // gotten cleared while running script since we last checked it.
+    if (NS_WARN_IF(!mPrintObject)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    PrintDocContent(mPrintObject, rv);  // ignore return value
+  }
+
+  return rv;
+}
+
+//-------------------------------------------------------
+// Recursively reflow each sub-doc and then calc
+// all the frame locations of the sub-docs
+nsresult nsPrintJob::ReflowDocList(const UniquePtr<nsPrintObject>& aPO) {
+  NS_ENSURE_ARG_POINTER(aPO);
+
+  // Check to see if the subdocument's element has been hidden by the parent
+  // document
+  if (aPO->mParent && aPO->mParent->mPresShell) {
+    nsIFrame* frame =
+        aPO->mContent ? aPO->mContent->GetPrimaryFrame() : nullptr;
+    if (!frame || !frame->StyleVisibility()->IsVisible()) {
+      aPO->EnablePrinting(false);
+      aPO->mInvisible = true;
+      return NS_OK;
+    }
+  }
+
+  UpdateZoomRatio(aPO.get());
+
+  // Reflow the PO
+  MOZ_TRY(ReflowPrintObject(aPO));
+
+  for (const UniquePtr<nsPrintObject>& kid : aPO->mKids) {
+    MOZ_TRY(ReflowDocList(kid));
+  }
+  return NS_OK;
+}
+
+void nsPrintJob::FirePrintPreviewUpdateEvent() {
+  // Dispatch the event only while in PrintPreview. When printing, there is no
+  // listener bound to this event and therefore no need to dispatch it.
+  if (mCreatedForPrintPreview && !mIsDoingPrinting) {
+    nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint);
+    if (Document* document = cv->GetDocument()) {
+      AsyncEventDispatcher::RunDOMEventWhenSafe(
+          *document, u"printPreviewUpdate"_ns, CanBubble::eYes,
+          ChromeOnlyDispatch::eYes);
+    }
+  }
+}
+
+nsresult nsPrintJob::InitPrintDocConstruction(bool aHandleError) {
+  // Guarantee that mPrintObject won't be deleted.
+  RefPtr<nsPrintData> printData = mPrt;
+
+  if (NS_WARN_IF(!printData)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Attach progressListener to catch network requests.
+  mDidLoadDataForPrinting = false;
+
+  {
+    AutoRestore<bool> restore{mDoingInitialReflow};
+    mDoingInitialReflow = true;
+
+    nsCOMPtr<nsIWebProgress> webProgress =
+        do_QueryInterface(mPrintObject->mDocShell);
+    webProgress->AddProgressListener(static_cast<nsIWebProgressListener*>(this),
+                                     nsIWebProgress::NOTIFY_STATE_REQUEST);
+
+    MOZ_TRY(ReflowDocList(mPrintObject));
+
+    FirePrintPreviewUpdateEvent();
+  }
+
+  MaybeResumePrintAfterResourcesLoaded(aHandleError);
+  return NS_OK;
+}
+
+bool nsPrintJob::ShouldResumePrint() const {
+  if (mDoingInitialReflow) {
+    return false;
+  }
+  Document* doc = mPrintObject->mDocument;
+  MOZ_ASSERT(doc);
+  NS_ENSURE_TRUE(doc, true);
+  nsCOMPtr<nsILoadGroup> lg = doc->GetDocumentLoadGroup();
+  NS_ENSURE_TRUE(lg, true);
+  bool pending = false;
+  nsresult rv = lg->IsPending(&pending);
+  NS_ENSURE_SUCCESS(rv, true);
+  return !pending;
+}
+
+nsresult nsPrintJob::MaybeResumePrintAfterResourcesLoaded(
+    bool aCleanupOnError) {
+  if (!ShouldResumePrint()) {
+    mDidLoadDataForPrinting = true;
+    return NS_OK;
+  }
+  // If Destroy() has already been called, mPtr is nullptr.  Then, the instance
+  // needs to do nothing anymore in this method.
+  // Note: it shouldn't be possible for mPrintObject to be null; we
+  // just check it for good measure, as we check its owner.
+  // Note: it shouldn't be possible for mPrintObject->mDocShell to be
+  // null; we just check it for good measure, as we check its owner.
+  if (!mPrt || NS_WARN_IF(!mPrintObject) ||
+      NS_WARN_IF(!mPrintObject->mDocShell)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIWebProgress> webProgress =
+      do_QueryInterface(mPrintObject->mDocShell);
+
+  webProgress->RemoveProgressListener(
+      static_cast<nsIWebProgressListener*>(this));
+
+  nsresult rv;
+  if (mIsDoingPrinting) {
+    rv = DocumentReadyForPrinting();
+  } else {
+    rv = FinishPrintPreview();
+  }
+
+  /* cleaup on failure + notify user */
+  if (aCleanupOnError && NS_FAILED(rv)) {
+    NS_WARNING_ASSERTION(rv == NS_ERROR_ABORT,
+                         "nsPrintJob::ResumePrintAfterResourcesLoaded failed");
+    CleanupOnFailure(rv, !mIsDoingPrinting);
+  }
+
+  return rv;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIWebProgressListener
+
+MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODIMP
+nsPrintJob::OnStateChange(nsIWebProgress* aWebProgress, nsIRequest* aRequest,
+                          uint32_t aStateFlags, nsresult aStatus) {
+  if (aStateFlags & STATE_STOP) {
+    // If all resources are loaded, then finish and reflow.
+    MaybeResumePrintAfterResourcesLoaded(/* aCleanupOnError */ true);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrintJob::OnProgressChange(nsIWebProgress* aWebProgress, nsIRequest* aRequest,
+                             int32_t aCurSelfProgress, int32_t aMaxSelfProgress,
+                             int32_t aCurTotalProgress,
+                             int32_t aMaxTotalProgress) {
+  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrintJob::OnLocationChange(nsIWebProgress* aWebProgress, nsIRequest* aRequest,
+                             nsIURI* aLocation, uint32_t aFlags) {
+  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrintJob::OnStatusChange(nsIWebProgress* aWebProgress, nsIRequest* aRequest,
+                           nsresult aStatus, const char16_t* aMessage) {
+  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrintJob::OnSecurityChange(nsIWebProgress* aWebProgress, nsIRequest* aRequest,
+                             uint32_t aState) {
+  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrintJob::OnContentBlockingEvent(nsIWebProgress* aWebProgress,
+                                   nsIRequest* aRequest, uint32_t aEvent) {
+  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
+  return NS_OK;
+}
+
+//-------------------------------------------------------
+
+void nsPrintJob::UpdateZoomRatio(nsPrintObject* aPO) {
+  if (!aPO->mParent) {
+    if (mShrinkToFit) {
+      aPO->mZoomRatio = mShrinkToFitFactor;
+      // If we're actually going to scale (the factor is less than 1), we
+      // reduce the scale factor slightly to avoid the possibility of floating
+      // point rounding error causing slight clipping of the longest lines.
+      if (aPO->mZoomRatio != 1.0f) {
+        aPO->mZoomRatio -= 0.005f;
+      }
+    } else {
+      double scaling;
+      mPrintSettings->GetScaling(&scaling);
+      aPO->mZoomRatio = float(scaling);
+    }
+  }
+}
+
+nsresult nsPrintJob::UpdateSelectionAndShrinkPrintObject(
+    nsPrintObject* aPO, bool aDocumentIsTopLevel) {
+  PresShell* displayPresShell = aPO->mDocShell->GetPresShell();
+  // Transfer Selection Ranges to the new Print PresShell
+  RefPtr<Selection> selection, selectionPS;
+  // It's okay if there is no display shell, just skip copying the selection
+  if (displayPresShell) {
+    selection = displayPresShell->GetCurrentSelection(SelectionType::eNormal);
+  }
+  selectionPS = aPO->mPresShell->GetCurrentSelection(SelectionType::eNormal);
+
+  // Reset all existing selection ranges that might have been added by calling
+  // this function before.
+  if (selectionPS) {
+    selectionPS->RemoveAllRanges(IgnoreErrors());
+  }
+  if (selection && selectionPS) {
+    const uint32_t rangeCount = selection->RangeCount();
+    for (const uint32_t inx : IntegerRange(rangeCount)) {
+      MOZ_ASSERT(selection->RangeCount() == rangeCount);
+      const RefPtr<nsRange> range{selection->GetRangeAt(inx)};
+      selectionPS->AddRangeAndSelectFramesAndNotifyListeners(*range,
+                                                             IgnoreErrors());
+    }
+  }
+
+  // If we are trying to shrink the contents to fit on the page
+  // we must first locate the "pageContent" frame
+  // Then we walk the frame tree and look for the "xmost" frame
+  // this is the frame where the right-hand side of the frame extends
+  // the furthest
+  if (mShrinkToFit && aDocumentIsTopLevel) {
+    nsPageSequenceFrame* pageSeqFrame = aPO->mPresShell->GetPageSequenceFrame();
+    NS_ENSURE_STATE(pageSeqFrame);
+    aPO->mShrinkRatio = pageSeqFrame->GetSTFPercent();
+    // Limit the shrink-to-fit scaling for some text-ish type of documents.
+    nsAutoString contentType;
+    aPO->mPresShell->GetDocument()->GetContentType(contentType);
+    if (contentType.EqualsLiteral("application/xhtml+xml") ||
+        StringBeginsWith(contentType, u"text/"_ns)) {
+      int32_t limitPercent =
+          Preferences::GetInt("print.shrink-to-fit.scale-limit-percent", 20);
+      limitPercent = std::max(0, limitPercent);
+      limitPercent = std::min(100, limitPercent);
+      float minShrinkRatio = float(limitPercent) / 100;
+      aPO->mShrinkRatio = std::max(aPO->mShrinkRatio, minShrinkRatio);
+    }
+  }
+  return NS_OK;
+}
+
+nsView* nsPrintJob::GetParentViewForRoot() {
+  if (mIsCreatingPrintPreview) {
+    if (nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint)) {
+      return cv->FindContainerView();
+    }
+  }
+  return nullptr;
+}
+
+nsresult nsPrintJob::SetRootView(nsPrintObject* aPO, bool& doReturn,
+                                 bool& documentIsTopLevel, nsSize& adjSize) {
+  bool canCreateScrollbars = true;
+
+  nsView* rootView;
+  nsView* parentView = nullptr;
+
+  doReturn = false;
+
+  if (aPO->mParent && aPO->mParent->PrintingIsEnabled()) {
+    nsIFrame* frame =
+        aPO->mContent ? aPO->mContent->GetPrimaryFrame() : nullptr;
+    // Without a frame, this document can't be displayed; therefore, there is no
+    // point to reflowing it
+    if (!frame) {
+      aPO->EnablePrinting(false);
+      doReturn = true;
+      return NS_OK;
+    }
+
+    // XXX If printing supported printing document hierarchies with non-constant
+    // zoom this would be wrong as we use the same mPrt->mPrintDC for all
+    // subdocuments.
+    adjSize = frame->GetContentRect().Size();
+    documentIsTopLevel = false;
+    // presshell exists because parent is printable
+
+    // the top nsPrintObject's widget will always have scrollbars
+    if (frame && frame->IsSubDocumentFrame()) {
+      nsView* view = frame->GetView();
+      NS_ENSURE_TRUE(view, NS_ERROR_FAILURE);
+      view = view->GetFirstChild();
+      NS_ENSURE_TRUE(view, NS_ERROR_FAILURE);
+      parentView = view;
+      canCreateScrollbars = false;
+    }
+  } else {
+    nscoord pageWidth, pageHeight;
+    mPrt->mPrintDC->GetDeviceSurfaceDimensions(pageWidth, pageHeight);
+    adjSize = nsSize(pageWidth, pageHeight);
+    documentIsTopLevel = true;
+    parentView = GetParentViewForRoot();
+  }
+
+  if (aPO->mViewManager->GetRootView()) {
+    // Reuse the root view that is already on the root frame.
+    rootView = aPO->mViewManager->GetRootView();
+    // Remove it from its existing parent if necessary
+    aPO->mViewManager->RemoveChild(rootView);
+    rootView->SetParent(parentView);
+  } else {
+    // Create a child window of the parent that is our "root view/window"
+    nsRect tbounds = nsRect(nsPoint(0, 0), adjSize);
+    rootView = aPO->mViewManager->CreateView(tbounds, parentView);
+    NS_ENSURE_TRUE(rootView, NS_ERROR_OUT_OF_MEMORY);
+  }
+
+  if (mIsCreatingPrintPreview && documentIsTopLevel) {
+    aPO->mPresContext->SetPaginatedScrolling(canCreateScrollbars);
+  }
+
+  // Setup hierarchical relationship in view manager
+  aPO->mViewManager->SetRootView(rootView);
+
+  return NS_OK;
+}
+
+// Reflow a nsPrintObject
+nsresult nsPrintJob::ReflowPrintObject(const UniquePtr<nsPrintObject>& aPO) {
+  NS_ENSURE_STATE(aPO);
+
+  if (!aPO->PrintingIsEnabled()) {
+    return NS_OK;
+  }
+
+  NS_ASSERTION(!aPO->mPresContext, "Recreating prescontext");
+
+  // Guarantee that mPrt and the objects it owns won't be deleted in this method
+  // because it might be cleared if other modules called from here may fire
+  // events, notifying observers and/or listeners.
+  RefPtr<nsPrintData> printData = mPrt;
+
+  // create the PresContext
+  nsPresContext::nsPresContextType type =
+      mIsCreatingPrintPreview ? nsPresContext::eContext_PrintPreview
+                              : nsPresContext::eContext_Print;
+  const bool shouldBeRoot =
+      (!aPO->mParent || !aPO->mParent->PrintingIsEnabled()) &&
+      !GetParentViewForRoot();
+  aPO->mPresContext = shouldBeRoot ? new nsRootPresContext(aPO->mDocument, type)
+                                   : new nsPresContext(aPO->mDocument, type);
+  aPO->mPresContext->SetPrintSettings(mPrintSettings);
+
+  // init it with the DC
+  MOZ_TRY(aPO->mPresContext->Init(printData->mPrintDC));
+
+  aPO->mViewManager = new nsViewManager();
+
+  MOZ_TRY(aPO->mViewManager->Init(printData->mPrintDC));
+
+  bool doReturn = false;
+  bool documentIsTopLevel = false;
+  nsSize adjSize;
+
+  nsresult rv = SetRootView(aPO.get(), doReturn, documentIsTopLevel, adjSize);
+
+  if (NS_FAILED(rv) || doReturn) {
+    return rv;
+  }
+
+  // Here, we inform nsPresContext of the page size. Note that 'adjSize' is
+  // *usually* the page size, but we need to check. Strictly speaking, adjSize
+  // is the *device output size*, which is really the dimensions of a "sheet"
+  // rather than a "page" (an important distinction in an N-pages-per-sheet
+  // scenario). For some pages-per-sheet values, the pages are orthogonal to
+  // the sheet; we adjust for that here by swapping the width with the height.
+  nsSize pageSize = adjSize;
+  if (mPrintSettings->HasOrthogonalSheetsAndPages()) {
+    std::swap(pageSize.width, pageSize.height);
+  }
+  // XXXalaskanemily: Is this actually necessary? We set it again before the
+  // first reflow.
+  aPO->mPresContext->SetPageSize(pageSize);
+
+  int32_t p2a = aPO->mPresContext->DeviceContext()->AppUnitsPerDevPixel();
+  if (documentIsTopLevel && mIsCreatingPrintPreview) {
+    if (nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint)) {
+      // If we're print-previewing and the top level document, use the bounds
+      // from our doc viewer. Page bounds is not what we want.
+      nsIntRect bounds;
+      cv->GetBounds(bounds);
+      adjSize = nsSize(bounds.width * p2a, bounds.height * p2a);
+    }
+  }
+  aPO->mPresContext->SetIsRootPaginatedDocument(documentIsTopLevel);
+  aPO->mPresContext->SetVisibleArea(nsRect(nsPoint(), adjSize));
+  aPO->mPresContext->SetPageScale(aPO->mZoomRatio);
+  // Calculate scale factor from printer to screen
+  float printDPI = float(AppUnitsPerCSSInch()) / float(p2a);
+  aPO->mPresContext->SetPrintPreviewScale(mScreenDPI / printDPI);
+
+  // Do CreatePresShell() after we setup the page size, the visible area, and
+  // the flag |mIsRootPaginatedDocument|, to make sure we can resolve the
+  // correct viewport size for the print preview page when notifying the media
+  // feature values changed. See au_viewport_size_for_viewport_unit_resolution()
+  // in media_queries.rs for more details.
+  RefPtr<Document> doc = aPO->mDocument;
+  RefPtr<nsPresContext> presContext = aPO->mPresContext;
+  RefPtr<nsViewManager> viewManager = aPO->mViewManager;
+
+  aPO->mPresShell = doc->CreatePresShell(presContext, viewManager);
+  if (!aPO->mPresShell) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // If we're printing selection then remove the nonselected nodes from our
+  // cloned document.
+  if (mPrintSettings->GetPrintSelectionOnly()) {
+    // If we fail to remove the nodes then we should fail to print, because if
+    // the user was trying to print a small selection from a large document,
+    // sending the whole document to a real printer would be very frustrating.
+    MOZ_TRY(DeleteNonSelectedNodes(*aPO->mDocument));
+  }
+
+  aPO->mPresShell->BeginObservingDocument();
+
+  PR_PL(
+      ("In DV::ReflowPrintObject PO: %p pS: %p (%9s) Setting page size w,h to "
+       "%d,%d\n",
+       aPO.get(), aPO->mPresShell.get(), LoggableTypeOfPO(aPO.get()),
+       pageSize.width, pageSize.height));
+
+  if (mIsCreatingPrintPreview && documentIsTopLevel) {
+    mDocViewerPrint->SetPrintPreviewPresentation(
+        aPO->mViewManager, aPO->mPresContext, aPO->mPresShell.get());
+  }
+
+  MOZ_TRY(aPO->mPresShell->Initialize());
+  NS_ASSERTION(aPO->mPresShell, "Presshell should still be here");
+
+  RefPtr<PresShell> presShell = aPO->mPresShell;
+  {
+    // Get the initial page name. Even though we haven't done any page-name
+    // fragmentation (that happens during block reflow), this will still be
+    // valid to find the first page's name.
+    const nsAtom* firstPageName = nsGkAtoms::_empty;
+    if (const Element* const rootElement = aPO->mDocument->GetRootElement()) {
+      if (const nsIFrame* const rootFrame = rootElement->GetPrimaryFrame()) {
+        firstPageName = rootFrame->ComputePageValue();
+      }
+    }
+
+    const ServoStyleSet::FirstPageSizeAndOrientation sizeAndOrientation =
+        presShell->StyleSet()->GetFirstPageSizeAndOrientation(firstPageName);
+    if (mPrintSettings->GetUsePageRuleSizeAsPaperSize()) {
+      mMaybeCSSPageSize = sizeAndOrientation.size;
+      if (sizeAndOrientation.size) {
+        pageSize = sizeAndOrientation.size.value();
+        aPO->mPresContext->SetPageSize(pageSize);
+      }
+    }
+
+    // If the document has a specified CSS page-size, we rotate the page to
+    // reflect this. Changing the orientation is reflected by the result of
+    // FinishPrintPreview, so that the frontend can reflect this.
+    // The new document has not yet been reflowed, so we have to query the
+    // original document for any CSS page-size.
+    if (sizeAndOrientation.orientation) {
+      switch (sizeAndOrientation.orientation.value()) {
+        case StylePageSizeOrientation::Landscape:
+          if (pageSize.width < pageSize.height) {
+            // Paper is in portrait, CSS page size is landscape.
+            std::swap(pageSize.width, pageSize.height);
+          }
+          break;
+        case StylePageSizeOrientation::Portrait:
+          if (pageSize.width > pageSize.height) {
+            // Paper is in landscape, CSS page size is portrait.
+            std::swap(pageSize.width, pageSize.height);
+          }
+          break;
+      }
+      mMaybeCSSPageLandscape = Some(sizeAndOrientation.orientation.value() ==
+                                    StylePageSizeOrientation::Landscape);
+      aPO->mPresContext->SetPageSize(pageSize);
+    }
+  }
+  // Process the reflow event Initialize posted
+  presShell->FlushPendingNotifications(FlushType::Layout);
+
+  MOZ_TRY(UpdateSelectionAndShrinkPrintObject(aPO.get(), documentIsTopLevel));
+
+#ifdef EXTENDED_DEBUG_PRINTING
+  if (MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    nsAutoCString docStr;
+    nsAutoCString urlStr;
+    GetDocTitleAndURL(aPO, docStr, urlStr);
+    char filename[256];
+    sprintf(filename, "print_dump_%d.txt", gDumpFileNameCnt++);
+    // Dump all the frames and view to a a file
+    FILE* fd = fopen(filename, "w");
+    if (fd) {
+      nsIFrame* theRootFrame = aPO->mPresShell->GetRootFrame();
+      fprintf(fd, "Title: %s\n", docStr.get());
+      fprintf(fd, "URL:   %s\n", urlStr.get());
+      fprintf(fd, "--------------- Frames ----------------\n");
+      // RefPtr<gfxContext> renderingContext =
+      //  printData->mPrintDocDC->CreateRenderingContext();
+      RootFrameList(aPO->mPresContext, fd, 0);
+      // DumpFrames(fd, aPO->mPresContext, renderingContext, theRootFrame, 0);
+      fprintf(fd, "---------------------------------------\n\n");
+      fprintf(fd, "--------------- Views From Root Frame----------------\n");
+      nsView* v = theRootFrame->GetView();
+      if (v) {
+        v->List(fd);
+      } else {
+        printf("View is null!\n");
+      }
+      if (aPO->mDocShell) {
+        fprintf(fd, "--------------- All Views ----------------\n");
+        DumpViews(aPO->mDocShell, fd);
+        fprintf(fd, "---------------------------------------\n\n");
+      }
+      fclose(fd);
+    }
+  }
+#endif
+
+  return NS_OK;
+}
+
+//-------------------------------------------------------
+// Figure out how many documents and how many total pages we are printing
+void nsPrintJob::CalcNumPrintablePages(int32_t& aNumPages) {
+  aNumPages = 0;
+  // Count the number of printable documents and printable pages
+  for (nsPrintObject* po : mPrintDocList) {
+    // Note: The po->mPresContext null-check below is necessary, because it's
+    // possible po->mPresContext might never have been set.  (e.g., if
+    // PrintingIsEnabled() returns false, ReflowPrintObject bails before setting
+    // mPresContext)
+    if (po->mPresContext && po->mPresContext->IsRootPaginatedDocument()) {
+      nsPageSequenceFrame* seqFrame = po->mPresShell->GetPageSequenceFrame();
+      if (seqFrame) {
+        aNumPages += seqFrame->PrincipalChildList().GetLength();
+      }
+    }
+  }
+}
+
+//-----------------------------------------------------------------
+//-- Done: Reflow Methods
+//-----------------------------------------------------------------
+
+//-----------------------------------------------------------------
+//-- Section: Printing Methods
+//-----------------------------------------------------------------
+
+//-------------------------------------------------------
+// Called for each DocShell that needs to be printed
+bool nsPrintJob::PrintDocContent(const UniquePtr<nsPrintObject>& aPO,
+                                 nsresult& aStatus) {
+  NS_ASSERTION(aPO, "Pointer is null!");
+  aStatus = NS_OK;
+
+  if (!aPO->mHasBeenPrinted && aPO->PrintingIsEnabled()) {
+    aStatus = DoPrint(aPO);
+    return true;
+  }
+
+  // If |aPO->mHasBeenPrinted| is true,
+  // the kids frames are already processed in |PrintPage|.
+  // XXX This should be removed. Since bug 1552785 it has no longer been
+  // possible for us to have to print multiple subdocuments consecutively.
+  if (!aPO->mHasBeenPrinted && !aPO->mInvisible) {
+    for (const UniquePtr<nsPrintObject>& po : aPO->mKids) {
+      bool printed = PrintDocContent(po, aStatus);
+      if (printed || NS_FAILED(aStatus)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+// A helper struct to aid with DeleteNonSelectedNodes.
+struct MOZ_STACK_CLASS SelectionRangeState {
+  explicit SelectionRangeState(RefPtr<Selection> aSelection)
+      : mSelection(std::move(aSelection)) {
+    MOZ_ASSERT(mSelection);
+    MOZ_ASSERT(!mSelection->RangeCount());
+  }
+
+  // Selects all the nodes that are _not_ included in a given set of ranges.
+  MOZ_CAN_RUN_SCRIPT void SelectComplementOf(Span<const RefPtr<nsRange>>);
+  // Removes the selected ranges from the document.
+  MOZ_CAN_RUN_SCRIPT void RemoveSelectionFromDocument();
+
+ private:
+  struct Position {
+    nsINode* mNode;
+    uint32_t mOffset;
+  };
+
+  MOZ_CAN_RUN_SCRIPT void SelectRange(nsRange*);
+  MOZ_CAN_RUN_SCRIPT void SelectNodesExcept(const Position& aStart,
+                                            const Position& aEnd);
+  MOZ_CAN_RUN_SCRIPT void SelectNodesExceptInSubtree(const Position& aStart,
+                                                     const Position& aEnd);
+
+  // A map from subtree root (document or shadow root) to the start position of
+  // the non-selected content (so far).
+  nsTHashMap<nsPtrHashKey<nsINode>, Position> mPositions;
+
+  // The selection we're adding the ranges to.
+  const RefPtr<Selection> mSelection;
+};
+
+void SelectionRangeState::SelectComplementOf(
+    Span<const RefPtr<nsRange>> aRanges) {
+  for (const auto& range : aRanges) {
+    auto start = Position{range->GetStartContainer(), range->StartOffset()};
+    auto end = Position{range->GetEndContainer(), range->EndOffset()};
+    SelectNodesExcept(start, end);
+  }
+}
+
+void SelectionRangeState::SelectRange(nsRange* aRange) {
+  if (aRange && !aRange->Collapsed()) {
+    mSelection->AddRangeAndSelectFramesAndNotifyListeners(*aRange,
+                                                          IgnoreErrors());
+  }
+}
+
+void SelectionRangeState::SelectNodesExcept(const Position& aStart,
+                                            const Position& aEnd) {
+  SelectNodesExceptInSubtree(aStart, aEnd);
+  if (auto* shadow = ShadowRoot::FromNode(aStart.mNode->SubtreeRoot())) {
+    auto* host = shadow->Host();
+    SelectNodesExcept(Position{host, 0}, Position{host, host->GetChildCount()});
+  } else {
+    MOZ_ASSERT(aStart.mNode->IsInUncomposedDoc());
+  }
+}
+
+void SelectionRangeState::SelectNodesExceptInSubtree(const Position& aStart,
+                                                     const Position& aEnd) {
+  static constexpr auto kEllipsis = u"\x2026"_ns;
+
+  nsINode* root = aStart.mNode->SubtreeRoot();
+  auto& start =
+      mPositions.WithEntryHandle(root, [&](auto&& entry) -> Position& {
+        return entry.OrInsertWith([&] { return Position{root, 0}; });
+      });
+
+  bool ellipsizedStart = false;
+  if (auto* text = Text::FromNode(aStart.mNode)) {
+    if (start.mNode != text && aStart.mOffset &&
+        aStart.mOffset < text->Length()) {
+      text->InsertData(aStart.mOffset, kEllipsis, IgnoreErrors());
+      ellipsizedStart = true;
+    }
+  }
+
+  RefPtr<nsRange> range = nsRange::Create(
+      start.mNode, start.mOffset, aStart.mNode, aStart.mOffset, IgnoreErrors());
+  SelectRange(range);
+
+  start = aEnd;
+
+  // If we added an ellipsis at the start and the end position was relative to
+  // the same node account for it here.
+  if (ellipsizedStart && aStart.mNode == aEnd.mNode) {
+    start.mOffset += kEllipsis.Length();
+  }
+
+  // If the end is mid text then add an ellipsis.
+  if (auto* text = Text::FromNode(start.mNode)) {
+    if (start.mOffset && start.mOffset < text->Length()) {
+      text->InsertData(start.mOffset, kEllipsis, IgnoreErrors());
+      start.mOffset += kEllipsis.Length();
+    }
+  }
+}
+
+void SelectionRangeState::RemoveSelectionFromDocument() {
+  for (auto& entry : mPositions) {
+    const Position& pos = entry.GetData();
+    nsINode* root = entry.GetKey();
+    RefPtr<nsRange> range = nsRange::Create(
+        pos.mNode, pos.mOffset, root, root->GetChildCount(), IgnoreErrors());
+    SelectRange(range);
+  }
+  mSelection->DeleteFromDocument(IgnoreErrors());
+}
+
+/**
+ * Builds the complement set of ranges and adds those to the selection.
+ * Deletes all of the nodes contained in the complement set of ranges
+ * leaving behind only nodes that were originally selected.
+ * Adds ellipses to a selected node's text if text is truncated by a range.
+ * This is used to implement the "Print Selection Only" user interface option.
+ */
+MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult DeleteNonSelectedNodes(
+    Document& aDoc) {
+  MOZ_ASSERT(aDoc.IsStaticDocument());
+  const auto* printRanges = static_cast<nsTArray<RefPtr<nsRange>>*>(
+      aDoc.GetProperty(nsGkAtoms::printselectionranges));
+  if (!printRanges) {
+    return NS_OK;
+  }
+
+  PresShell* presShell = aDoc.GetPresShell();
+  NS_ENSURE_STATE(presShell);
+  RefPtr<Selection> selection =
+      presShell->GetCurrentSelection(SelectionType::eNormal);
+  NS_ENSURE_STATE(selection);
+
+  SelectionRangeState state(std::move(selection));
+  state.SelectComplementOf(*printRanges);
+  state.RemoveSelectionFromDocument();
+  return NS_OK;
+}
+
+//-------------------------------------------------------
+nsresult nsPrintJob::DoPrint(const UniquePtr<nsPrintObject>& aPO) {
+  PR_PL(("\n"));
+  PR_PL(("**************************** %s ****************************\n",
+         LoggableTypeOfPO(aPO.get())));
+  PR_PL(("****** In DV::DoPrint   PO: %p \n", aPO.get()));
+
+  PresShell* poPresShell = aPO->mPresShell;
+  nsPresContext* poPresContext = aPO->mPresContext;
+
+  NS_ASSERTION(poPresContext, "PrintObject has not been reflowed");
+  NS_ASSERTION(poPresContext->Type() != nsPresContext::eContext_PrintPreview,
+               "How did this context end up here?");
+
+  // Guarantee that mPrt and the objects it owns won't be deleted in this method
+  // because it might be cleared if other modules called from here may fire
+  // events, notifying observers and/or listeners.
+  RefPtr<nsPrintData> printData = mPrt;
+  if (NS_WARN_IF(!printData)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  {
+    // Ask the page sequence frame to print all the pages
+    nsPageSequenceFrame* seqFrame = poPresShell->GetPageSequenceFrame();
+    MOZ_ASSERT(seqFrame, "no page sequence frame");
+
+    // We are done preparing for printing, so we can turn this off
+    mPreparingForPrint = false;
+
+#ifdef EXTENDED_DEBUG_PRINTING
+    nsIFrame* rootFrame = poPresShell->GetRootFrame();
+    if (aPO->PrintingIsEnabled()) {
+      nsAutoCString docStr;
+      nsAutoCString urlStr;
+      GetDocTitleAndURL(aPO, docStr, urlStr);
+      DumpLayoutData(docStr.get(), urlStr.get(), poPresContext,
+                     printData->mPrintDC, rootFrame, aPO->mDocShell, nullptr);
+    }
+#endif
+
+    if (!mPrintSettings) {
+      // not sure what to do here!
+      SetIsPrinting(false);
+      return NS_ERROR_FAILURE;
+    }
+
+    nsAutoString docTitleStr;
+    nsAutoString docURLStr;
+    GetDisplayTitleAndURL(*aPO->mDocument, mPrintSettings,
+                          DocTitleDefault::eFallback, docTitleStr, docURLStr);
+
+    if (!seqFrame) {
+      SetIsPrinting(false);
+      return NS_ERROR_FAILURE;
+    }
+
+    // For telemetry, get paper size being used; convert the dimensions to
+    // points and ensure they reflect portrait orientation.
+    nsIPrintSettings* settings = mPrintSettings;
+    double paperWidth, paperHeight;
+    settings->GetPaperWidth(&paperWidth);
+    settings->GetPaperHeight(&paperHeight);
+    int16_t sizeUnit;
+    settings->GetPaperSizeUnit(&sizeUnit);
+    switch (sizeUnit) {
+      case nsIPrintSettings::kPaperSizeInches:
+        paperWidth *= 72.0;
+        paperHeight *= 72.0;
+        break;
+      case nsIPrintSettings::kPaperSizeMillimeters:
+        paperWidth *= 72.0 / 25.4;
+        paperHeight *= 72.0 / 25.4;
+        break;
+      default:
+        MOZ_ASSERT_UNREACHABLE("unknown paper size unit");
+        break;
+    }
+    if (paperWidth > paperHeight) {
+      std::swap(paperWidth, paperHeight);
+    }
+    // Use the paper size to build a Telemetry Scalar key.
+    nsString key;
+    key.AppendInt(int32_t(NS_round(paperWidth)));
+    key.Append(u"x");
+    key.AppendInt(int32_t(NS_round(paperHeight)));
+    Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_PAPER_SIZE, key, 1);
+
+    mPageSeqFrame = seqFrame;
+    seqFrame->StartPrint(poPresContext, settings, docTitleStr, docURLStr);
+
+    // Schedule Page to Print
+    PR_PL(("Scheduling Print of PO: %p (%s) \n", aPO.get(),
+           LoggableTypeOfPO(aPO.get())));
+    StartPagePrintTimer(aPO);
+  }
+
+  return NS_OK;
+}
+
+//-------------------------------------------------------
+bool nsPrintJob::PrePrintSheet() {
+  NS_ASSERTION(mPageSeqFrame.IsAlive(), "mPageSeqFrame is not alive!");
+  NS_ASSERTION(mPrt, "mPrt is null!");
+
+  // Although these should NEVER be nullptr
+  // This is added insurance, to make sure we don't crash in optimized builds
+  if (!mPrt || !mPageSeqFrame.IsAlive()) {
+    return true;  // means we are done preparing the sheet.
+  }
+
+  // Guarantee that mPrt won't be deleted during a call of
+  // FirePrintingErrorEvent().
+  RefPtr<nsPrintData> printData = mPrt;
+
+  // Ask mPageSeqFrame if the sheet is ready to be printed.
+  // If the sheet doesn't get printed at all, the |done| will be |true|.
+  bool done = false;
+  nsPageSequenceFrame* pageSeqFrame = do_QueryFrame(mPageSeqFrame.GetFrame());
+  nsresult rv = pageSeqFrame->PrePrintNextSheet(mPagePrintTimer, &done);
+  if (NS_FAILED(rv)) {
+    // ??? ::PrintSheet doesn't set |printData->mIsAborted = true| if
+    // rv != NS_ERROR_ABORT, but I don't really understand why this should be
+    // the right thing to do?  Shouldn't |printData->mIsAborted| set to true
+    // all the time if something went wrong?
+    if (rv != NS_ERROR_ABORT) {
+      FirePrintingErrorEvent(rv);
+      printData->mIsAborted = true;
+    }
+    done = true;
+  }
+  return done;
+}
+
+bool nsPrintJob::PrintSheet(nsPrintObject* aPO, bool& aInRange) {
+  NS_ASSERTION(aPO, "aPO is null!");
+  NS_ASSERTION(mPageSeqFrame.IsAlive(), "mPageSeqFrame is not alive!");
+  NS_ASSERTION(mPrt, "mPrt is null!");
+
+  // XXXdholbert Nowadays, this function doesn't need to concern itself with
+  // page ranges -- page-range handling is now handled when we reflow our
+  // PrintedSheetFrames, and all PrintedSheetFrames are "in-range" and should
+  // be printed. So this outparam is unconditionally true. Bug 1669815 is filed
+  // on removing it entirely.
+  aInRange = true;
+
+  // Although these should NEVER be nullptr
+  // This is added insurance, to make sure we don't crash in optimized builds
+  if (!mPrt || !aPO || !mPageSeqFrame.IsAlive()) {
+    FirePrintingErrorEvent(NS_ERROR_FAILURE);
+    return true;  // means we are done printing
+  }
+
+  // Guarantee that mPrt won't be deleted during a call of
+  // nsPrintData::DoOnProgressChange() which runs some listeners,
+  // which may clear (& might otherwise destroy).
+  RefPtr<nsPrintData> printData = mPrt;
+
+  PR_PL(("-----------------------------------\n"));
+  PR_PL(("------ In DV::PrintSheet PO: %p (%s)\n", aPO, LoggableTypeOfPO(aPO)));
+
+  if (printData->mIsAborted) {
+    return true;
+  }
+
+  nsPageSequenceFrame* pageSeqFrame = do_QueryFrame(mPageSeqFrame.GetFrame());
+  const uint32_t sheetIdx = pageSeqFrame->GetCurrentSheetIdx();
+  const uint32_t numSheets = pageSeqFrame->PrincipalChildList().GetLength();
+
+  PR_PL(("****** Printing sheet index %d of %d sheets(s)\n", sheetIdx,
+         numSheets));
+
+  MOZ_ASSERT(numSheets > 0, "print operations must have at least 1 sheet");
+  MOZ_ASSERT(sheetIdx < numSheets,
+             "sheetIdx shouldn't be allowed to go out of bounds");
+  printData->DoOnProgressChange(sheetIdx, numSheets, false, 0);
+  if (NS_WARN_IF(mPrt != printData)) {
+    // If current printing is canceled or new print is started, let's return
+    // true to notify the caller of current printing is done.
+    return true;
+  }
+
+  // Print the sheet
+  // if a print job was cancelled externally, an EndPage or BeginPage may
+  // fail and the failure is passed back here.
+  // Returning true means we are done printing.
+  //
+  // When rv == NS_ERROR_ABORT, it means we want out of the
+  // print job without displaying any error messages
+  nsresult rv = pageSeqFrame->PrintNextSheet();
+  if (NS_FAILED(rv)) {
+    if (rv != NS_ERROR_ABORT) {
+      FirePrintingErrorEvent(rv);
+      printData->mIsAborted = true;
+    }
+    return true;
+  }
+
+  pageSeqFrame->DoPageEnd();
+
+  // If we just printed the final sheet (the one with index "numSheets-1"),
+  // then we're done!
+  return (sheetIdx == numSheets - 1);
+}
+
+void nsPrintJob::PageDone(nsresult aResult) {
+  MOZ_ASSERT(mIsDoingPrinting);
+
+  // mPagePrintTimer might be released during RemotePrintFinished, keep a
+  // reference here to make sure it lives long enough.
+  RefPtr<nsPagePrintTimer> timer = mPagePrintTimer;
+  timer->RemotePrintFinished();
+}
+
+//-----------------------------------------------------------------
+//-- Done: Printing Methods
+//-----------------------------------------------------------------
+
+//-----------------------------------------------------------------
+//-- Section: Misc Support Methods
+//-----------------------------------------------------------------
+
+//---------------------------------------------------------------------
+void nsPrintJob::SetIsPrinting(bool aIsPrinting) {
+  mIsDoingPrinting = aIsPrinting;
+  if (aIsPrinting) {
+    mPreparingForPrint = true;
+  }
+}
+
+//---------------------------------------------------------------------
+void nsPrintJob::SetIsPrintPreview(bool aIsPrintPreview) {
+  mCreatedForPrintPreview = aIsPrintPreview;
+
+  if (mDocViewerPrint) {
+    mDocViewerPrint->SetIsPrintPreview(aIsPrintPreview);
+  }
+}
+
+//-------------------------------------------------------
+bool nsPrintJob::DonePrintingSheets(nsPrintObject* aPO, nsresult aResult) {
+  // NS_ASSERTION(aPO, "Pointer is null!");
+  PR_PL(("****** In DV::DonePrintingSheets PO: %p (%s)\n", aPO,
+         aPO ? LoggableTypeOfPO(aPO) : ""));
+
+  // If there is a pageSeqFrame, make sure there are no more printCanvas active
+  // that might call |Notify| on the pagePrintTimer after things are cleaned up
+  // and printing was marked as being done.
+  if (mPageSeqFrame.IsAlive()) {
+    nsPageSequenceFrame* pageSeqFrame = do_QueryFrame(mPageSeqFrame.GetFrame());
+    pageSeqFrame->ResetPrintCanvasList();
+  }
+
+  // Guarantee that mPrt and mPrintObject won't be deleted during a
+  // call of PrintDocContent() and FirePrintCompletionEvent().
+  RefPtr<nsPrintData> printData = mPrt;
+
+  if (aPO && !printData->mIsAborted) {
+    aPO->mHasBeenPrinted = true;
+    nsresult rv;
+    bool didPrint = PrintDocContent(mPrintObject, rv);
+    if (NS_SUCCEEDED(rv) && didPrint) {
+      PR_PL(
+          ("****** In DV::DonePrintingSheets PO: %p (%s) didPrint:%s (Not Done "
+           "Printing)\n",
+           aPO, LoggableTypeOfPO(aPO), PRT_YESNO(didPrint)));
+      return false;
+    }
+  }
+
+  if (NS_SUCCEEDED(aResult)) {
+    FirePrintCompletionEvent();
+    // XXX mPrt may be cleared or replaced with new instance here.
+    //     However, the following methods will clean up with new mPrt or will
+    //     do nothing due to no proper nsPrintData instance.
+  }
+
+  SetIsPrinting(false);
+
+  // Release reference to mPagePrintTimer; the timer object destroys itself
+  // after this returns true
+  DisconnectPagePrintTimer();
+
+  return true;
+}
+
+//-------------------------------------------------------
+nsresult nsPrintJob::EnablePOsForPrinting() {
+  // Guarantee that mPrt and the objects it owns won't be deleted.
+  RefPtr<nsPrintData> printData = mPrt;
+
+  // NOTE: All POs have been "turned off" for printing
+  // this is where we decided which POs get printed.
+
+  if (!printData || !mPrintSettings) {
+    return NS_ERROR_FAILURE;
+  }
+
+  PR_PL(("\n"));
+  PR_PL(("********* nsPrintJob::EnablePOsForPrinting *********\n"));
+
+  if (!mPrintSettings->GetPrintSelectionOnly()) {
+    mPrintObject->EnablePrinting(true);
+    return NS_OK;
+  }
+
+  // This means we are either printing a selected iframe or
+  // we are printing the current selection.
+  NS_ENSURE_STATE(!mDisallowSelectionPrint && mSelectionRoot);
+
+  // If mSelectionRoot is a selected iframe without a selection, then just
+  // enable normally from that point.
+  if (mSelectionRoot->mParent && !mSelectionRoot->HasSelection()) {
+    mSelectionRoot->EnablePrinting(true);
+  } else {
+    // Otherwise, only enable nsPrintObjects that have a selection.
+    mSelectionRoot->EnablePrintingSelectionOnly();
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------
+//-- Done: Misc Support Methods
+//-----------------------------------------------------------------
+
+//-----------------------------------------------------------------
+//-- Section: Finishing up or Cleaning up
+//-----------------------------------------------------------------
+
+//-----------------------------------------------------------------
+nsresult nsPrintJob::FinishPrintPreview() {
+  nsresult rv = NS_OK;
+
+#ifdef NS_PRINT_PREVIEW
+
+  // If mPrt is null we've already finished with print preview. If mPrt is not
+  // null but mIsCreatingPrintPreview is false FinishPrintPreview must have
+  // already failed due to DocumentReadyForPrinting failing.
+  if (!mPrt || !mIsCreatingPrintPreview) {
+    return rv;
+  }
+
+  rv = DocumentReadyForPrinting();
+
+  // Note that this method may be called while the instance is being
+  // initialized.  Some methods which initialize the instance (e.g.,
+  // DoCommonPrint) may need to stop initializing and return error if
+  // this is called.  Therefore it's important to set mIsCreatingPrintPreview
+  // state to false here.  If you need to stop setting that here, you need to
+  // keep them being able to check whether the owner stopped using this
+  // instance.
+  mIsCreatingPrintPreview = false;
+
+  // mPrt may be cleared during a call of nsPrintData::OnEndPrinting()
+  // because that method invokes some arbitrary listeners.
+  // TODO(dshin): Does any listener attach to print preview? Doesn't seem like
+  // we call matching `OnStartPrinting()` for previews.
+  RefPtr<nsPrintData> printData = mPrt;
+  if (NS_FAILED(rv)) {
+    printData->OnEndPrinting();
+
+    return rv;
+  }
+
+  if (mPrintPreviewCallback) {
+    const bool hasSelection = !mDisallowSelectionPrint && mSelectionRoot;
+
+    Maybe<float> pageWidth;
+    Maybe<float> pageHeight;
+    if (mMaybeCSSPageSize) {
+      nsSize cssPageSize = *mMaybeCSSPageSize;
+      pageWidth = Some(float(cssPageSize.width) / float(AppUnitsPerCSSInch()));
+      pageHeight =
+          Some(float(cssPageSize.height) / float(AppUnitsPerCSSInch()));
+    }
+
+    mPrintPreviewCallback(PrintPreviewResultInfo(
+        GetPrintPreviewNumSheets(), GetRawNumPages(), GetIsEmpty(),
+        hasSelection, hasSelection && mPrintObject->HasSelection(),
+        mMaybeCSSPageLandscape, pageWidth, pageHeight));
+    mPrintPreviewCallback = nullptr;
+  }
+
+  // At this point we are done preparing everything
+  // before it is to be created
+
+  printData->OnEndPrinting();
+
+#endif  // NS_PRINT_PREVIEW
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------
+//-- Done: Finishing up or Cleaning up
+//-----------------------------------------------------------------
+
+/*=============== Timer Related Code ======================*/
+nsresult nsPrintJob::StartPagePrintTimer(const UniquePtr<nsPrintObject>& aPO) {
+  if (!mPagePrintTimer) {
+    // Get the delay time in between the printing of each page
+    // this gives the user more time to press cancel
+    int32_t printPageDelay = mPrintSettings->GetPrintPageDelay();
+
+    nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint);
+    NS_ENSURE_TRUE(cv, NS_ERROR_FAILURE);
+    nsCOMPtr<Document> doc = cv->GetDocument();
+    NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
+
+    mPagePrintTimer =
+        new nsPagePrintTimer(this, mDocViewerPrint, doc, printPageDelay);
+
+    if (mRemotePrintJob) {
+      mRemotePrintJob->SetPagePrintTimer(mPagePrintTimer);
+      mRemotePrintJob->SetPrintJob(this);
+    }
+  }
+
+  return mPagePrintTimer->Start(aPO.get());
+}
+
+//---------------------------------------------------------------
+//-- PLEvent Notification
+//---------------------------------------------------------------
+class nsPrintCompletionEvent : public Runnable {
+ public:
+  explicit nsPrintCompletionEvent(nsIDocumentViewerPrint* docViewerPrint)
+      : mozilla::Runnable("nsPrintCompletionEvent"),
+        mDocViewerPrint(docViewerPrint) {
+    NS_ASSERTION(mDocViewerPrint, "mDocViewerPrint is null.");
+  }
+
+  NS_IMETHOD Run() override {
+    if (mDocViewerPrint) mDocViewerPrint->OnDonePrinting();
+    return NS_OK;
+  }
+
+ private:
+  nsCOMPtr<nsIDocumentViewerPrint> mDocViewerPrint;
+};
+
+//-----------------------------------------------------------
+void nsPrintJob::FirePrintCompletionEvent() {
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIRunnable> event = new nsPrintCompletionEvent(mDocViewerPrint);
+  nsCOMPtr<nsIContentViewer> cv = do_QueryInterface(mDocViewerPrint);
+  NS_ENSURE_TRUE_VOID(cv);
+  nsCOMPtr<Document> doc = cv->GetDocument();
+  NS_ENSURE_TRUE_VOID(doc);
+
+  NS_ENSURE_SUCCESS_VOID(doc->Dispatch(TaskCategory::Other, event.forget()));
+}
+
+void nsPrintJob::DisconnectPagePrintTimer() {
+  if (mPagePrintTimer) {
+    mPagePrintTimer->Disconnect();
+    mPagePrintTimer = nullptr;
+  }
+}
+
+//---------------------------------------------------------------
+//---------------------------------------------------------------
+//-- Debug helper routines
+//---------------------------------------------------------------
+//---------------------------------------------------------------
+#if defined(XP_WIN) && defined(EXTENDED_DEBUG_PRINTING)
+#  include <windows.h>
+#  include <process.h>
+#  include <direct.h>
+
+#  define MY_FINDFIRST(a, b) FindFirstFile(a, b)
+#  define MY_FINDNEXT(a, b) FindNextFile(a, b)
+#  define ISDIR(a) (a.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+#  define MY_FINDCLOSE(a) FindClose(a)
+#  define MY_FILENAME(a) a.cFileName
+#  define MY_FILESIZE(a) (a.nFileSizeHigh * MAXDWORD) + a.nFileSizeLow
+
+int RemoveFilesInDir(const char* aDir) {
+  WIN32_FIND_DATA data_ptr;
+  HANDLE find_handle;
+
+  char path[MAX_PATH];
+
+  strcpy(path, aDir);
+
+  // Append slash to the end of the directory names if not there
+  if (path[strlen(path) - 1] != '\\') strcat(path, "\\");
+
+  char findPath[MAX_PATH];
+  strcpy(findPath, path);
+  strcat(findPath, "*.*");
+
+  find_handle = MY_FINDFIRST(findPath, &data_ptr);
+
+  if (find_handle != INVALID_HANDLE_VALUE) {
+    do {
+      if (ISDIR(data_ptr) && (stricmp(MY_FILENAME(data_ptr), ".")) &&
+          (stricmp(MY_FILENAME(data_ptr), ".."))) {
+        // skip
+      } else if (!ISDIR(data_ptr)) {
+        if (!strncmp(MY_FILENAME(data_ptr), "print_dump", 10)) {
+          char fileName[MAX_PATH];
+          strcpy(fileName, aDir);
+          strcat(fileName, "\\");
+          strcat(fileName, MY_FILENAME(data_ptr));
+          printf("Removing %s\n", fileName);
+          remove(fileName);
+        }
+      }
+    } while (MY_FINDNEXT(find_handle, &data_ptr));
+    MY_FINDCLOSE(find_handle);
+  }
+  return TRUE;
+}
+#endif
+
+#ifdef EXTENDED_DEBUG_PRINTING
+
+/** ---------------------------------------------------
+ *  Dumps Frames for Printing
+ */
+static void RootFrameList(nsPresContext* aPresContext, FILE* out,
+                          const char* aPrefix) {
+  if (!aPresContext || !out) return;
+
+  if (PresShell* presShell = aPresContext->GetPresShell()) {
+    nsIFrame* frame = presShell->GetRootFrame();
+    if (frame) {
+      frame->List(out, aPrefix);
+    }
+  }
+}
+
+/** ---------------------------------------------------
+ *  Dumps Frames for Printing
+ */
+static void DumpFrames(FILE* out, nsPresContext* aPresContext,
+                       gfxContext* aRendContext, nsIFrame* aFrame,
+                       int32_t aLevel) {
+  NS_ASSERTION(out, "Pointer is null!");
+  NS_ASSERTION(aPresContext, "Pointer is null!");
+  NS_ASSERTION(aRendContext, "Pointer is null!");
+  NS_ASSERTION(aFrame, "Pointer is null!");
+
+  nsIFrame* child = aFrame->PrincipalChildList().FirstChild();
+  while (child != nullptr) {
+    for (int32_t i = 0; i < aLevel; i++) {
+      fprintf(out, "  ");
+    }
+    nsAutoString tmp;
+    child->GetFrameName(tmp);
+    fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
+    bool isSelected;
+    if (child->IsVisibleForPainting()) {
+      fprintf(out, " %p %s", child, isSelected ? "VIS" : "UVS");
+      nsRect rect = child->GetRect();
+      fprintf(out, "[%d,%d,%d,%d] ", rect.x, rect.y, rect.width, rect.height);
+      fprintf(out, "v: %p ", (void*)child->GetView());
+      fprintf(out, "\n");
+      DumpFrames(out, aPresContext, aRendContext, child, aLevel + 1);
+      child = child->GetNextSibling();
+    }
+  }
+}
+
+/** ---------------------------------------------------
+ *  Dumps the Views from the DocShell
+ */
+static void DumpViews(nsIDocShell* aDocShell, FILE* out) {
+  NS_ASSERTION(aDocShell, "Pointer is null!");
+  NS_ASSERTION(out, "Pointer is null!");
+
+  if (nullptr != aDocShell) {
+    fprintf(out, "docshell=%p \n", aDocShell);
+    if (PresShell* presShell = aDocShell->GetPresShell()) {
+      nsViewManager* vm = presShell->GetViewManager();
+      if (vm) {
+        nsView* root = vm->GetRootView();
+        if (root) {
+          root->List(out);
+        }
+      }
+    } else {
+      fputs("null pres shell\n", out);
+    }
+
+    // dump the views of the sub documents
+    int32_t i, n;
+    BrowsingContext* bc = nsDocShell::Cast(aDocShell)->GetBrowsingContext();
+    for (auto& child : bc->Children()) {
+      if (auto childDS = child->GetDocShell()) {
+        DumpViews(childAsShell, out);
+      }
+    }
+  }
+}
+
+/** ---------------------------------------------------
+ *  Dumps the Views and Frames
+ */
+void DumpLayoutData(const char* aTitleStr, const char* aURLStr,
+                    nsPresContext* aPresContext, nsDeviceContext* aDC,
+                    nsIFrame* aRootFrame, nsIDocShell* aDocShell,
+                    FILE* aFD = nullptr) {
+  if (!MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    return;
+  }
+
+  if (aPresContext == nullptr || aDC == nullptr) {
+    return;
+  }
+
+#  ifdef NS_PRINT_PREVIEW
+  if (aPresContext->Type() == nsPresContext::eContext_PrintPreview) {
+    return;
+  }
+#  endif
+
+  NS_ASSERTION(aRootFrame, "Pointer is null!");
+  NS_ASSERTION(aDocShell, "Pointer is null!");
+
+  // Dump all the frames and view to a a file
+  char filename[256];
+  sprintf(filename, "print_dump_layout_%d.txt", gDumpLOFileNameCnt++);
+  FILE* fd = aFD ? aFD : fopen(filename, "w");
+  if (fd) {
+    fprintf(fd, "Title: %s\n", aTitleStr ? aTitleStr : "");
+    fprintf(fd, "URL:   %s\n", aURLStr ? aURLStr : "");
+    fprintf(fd, "--------------- Frames ----------------\n");
+    fprintf(fd, "--------------- Frames ----------------\n");
+    // RefPtr<gfxContext> renderingContext =
+    //  aDC->CreateRenderingContext();
+    RootFrameList(aPresContext, fd, "");
+    // DumpFrames(fd, aPresContext, renderingContext, aRootFrame, 0);
+    fprintf(fd, "---------------------------------------\n\n");
+    fprintf(fd, "--------------- Views From Root Frame----------------\n");
+    nsView* v = aRootFrame->GetView();
+    if (v) {
+      v->List(fd);
+    } else {
+      printf("View is null!\n");
+    }
+    if (aDocShell) {
+      fprintf(fd, "--------------- All Views ----------------\n");
+      DumpViews(aDocShell, fd);
+      fprintf(fd, "---------------------------------------\n\n");
+    }
+    if (aFD == nullptr) {
+      fclose(fd);
+    }
+  }
+}
+
+//-------------------------------------------------------------
+static void DumpPrintObjectsList(const nsTArray<nsPrintObject*>& aDocList) {
+  if (!MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    return;
+  }
+
+  PR_PL(("Doc List\n***************************************************\n"));
+  PR_PL(
+      ("T  P A H    PO    DocShell   Seq     Page      Root     Page#    "
+       "Rect\n"));
+  for (nsPrintObject* po : aDocList) {
+    NS_ASSERTION(po, "nsPrintObject can't be null!");
+    nsIFrame* rootFrame = nullptr;
+    if (po->mPresShell) {
+      rootFrame = po->mPresShell->GetRootFrame();
+      while (rootFrame != nullptr) {
+        nsPageSequenceFrame* sqf = do_QueryFrame(rootFrame);
+        if (sqf) {
+          break;
+        }
+        rootFrame = rootFrame->PrincipalChildList().FirstChild();
+      }
+    }
+
+    PR_PL(("%s %d %d %p %p %p\n", ShortLoggableTypeOfPO(po),
+           po->PrintingIsEnabled(), po->mHasBeenPrinted, po,
+           po->mDocShell.get(), rootFrame));
+  }
+}
+
+//-------------------------------------------------------------
+static void DumpPrintObjectsTree(nsPrintObject* aPO, int aLevel, FILE* aFD) {
+  if (!MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    return;
+  }
+
+  NS_ASSERTION(aPO, "Pointer is null!");
+
+  FILE* fd = aFD ? aFD : stdout;
+  if (aLevel == 0) {
+    fprintf(fd,
+            "DocTree\n***************************************************\n");
+    fprintf(fd, "T     PO    DocShell   Seq      Page     Page#    Rect\n");
+  }
+  for (const auto& po : aPO->mKids) {
+    NS_ASSERTION(po, "nsPrintObject can't be null!");
+    for (int32_t k = 0; k < aLevel; k++) fprintf(fd, "  ");
+    fprintf(fd, "%s %p %p\n", ShortLoggableTypeOfPO(po.get()), po.get(),
+            po->mDocShell.get());
+  }
+}
+
+//-------------------------------------------------------------
+static void GetDocTitleAndURL(const UniquePtr<nsPrintObject>& aPO,
+                              nsACString& aDocStr, nsACString& aURLStr) {
+  nsAutoString docTitleStr;
+  nsAutoString docURLStr;
+  GetDocumentTitleAndURL(aPO->mDocument, docTitleStr, docURLStr);
+  CopyUTF16toUTF8(docTitleStr, aDocStr);
+  CopyUTF16toUTF8(docURLStr, aURLStr);
+}
+
+//-------------------------------------------------------------
+static void DumpPrintObjectsTreeLayout(const UniquePtr<nsPrintObject>& aPO,
+                                       nsDeviceContext* aDC, int aLevel,
+                                       FILE* aFD) {
+  if (!MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    return;
+  }
+
+  NS_ASSERTION(aPO, "Pointer is null!");
+  NS_ASSERTION(aDC, "Pointer is null!");
+
+  FILE* fd = nullptr;
+  if (aLevel == 0) {
+    fd = fopen("tree_layout.txt", "w");
+    fprintf(fd,
+            "DocTree\n***************************************************\n");
+    fprintf(fd, "***************************************************\n");
+    fprintf(fd, "T     PO    DocShell   Seq      Page     Page#    Rect\n");
+  } else {
+    fd = aFD;
+  }
+  if (fd) {
+    nsIFrame* rootFrame = nullptr;
+    if (aPO->mPresShell) {
+      rootFrame = aPO->mPresShell->GetRootFrame();
+    }
+    for (int32_t k = 0; k < aLevel; k++) fprintf(fd, "  ");
+    fprintf(fd, "%s %p %p\n", ShortLoggableTypeOfPO(aPO.get()), aPO.get(),
+            aPO->mDocShell.get());
+    if (aPO->PrintingIsEnabled()) {
+      nsAutoCString docStr;
+      nsAutoCString urlStr;
+      GetDocTitleAndURL(aPO, docStr, urlStr);
+      DumpLayoutData(docStr.get(), urlStr.get(), aPO->mPresContext, aDC,
+                     rootFrame, aPO->mDocShell, fd);
+    }
+    fprintf(fd, "<***************************************************>\n");
+
+    for (const auto& po : aPO->mKids) {
+      NS_ASSERTION(po, "nsPrintObject can't be null!");
+      DumpPrintObjectsTreeLayout(po, aDC, aLevel + 1, fd);
+    }
+  }
+  if (aLevel == 0 && fd) {
+    fclose(fd);
+  }
+}
+
+//-------------------------------------------------------------
+static void DumpPrintObjectsListStart(
+    const char* aStr, const nsTArray<nsPrintObject*>& aDocList) {
+  if (!MOZ_LOG_TEST(gPrintingLog, DUMP_LAYOUT_LEVEL)) {
+    return;
+  }
+
+  NS_ASSERTION(aStr, "Pointer is null!");
+
+  PR_PL(("%s\n", aStr));
+  DumpPrintObjectsList(aDocList);
+}
+
+#endif
+
+//---------------------------------------------------------------
+//---------------------------------------------------------------
+//-- End of debug helper routines
+//---------------------------------------------------------------
diff --git a/layout/printing/nsPrintJob.h b/layout/printing/nsPrintJob.h
new file mode 100644
index 0000000000..d2ab0854ba
--- /dev/null
+++ b/layout/printing/nsPrintJob.h
@@ -0,0 +1,311 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsPrintJob_h
+#define nsPrintJob_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/layout/RemotePrintJobChild.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/UniquePtr.h"
+
+#include "nsCOMPtr.h"
+
+#include "nsHashKeys.h"
+#include "nsIFrame.h"  // For WeakFrame
+#include "nsSize.h"
+#include "nsTArray.h"
+#include "nsTHashtable.h"
+#include "nsWeakReference.h"
+
+// Interfaces
+#include "nsIWebProgress.h"
+#include "nsIWebProgressListener.h"
+
+// Classes
+class nsIFrame;
+class nsIPrintSettings;
+class nsPrintData;
+class nsPagePrintTimer;
+class nsIDocShell;
+class nsIDocumentViewerPrint;
+class nsIFrame;
+class nsPrintObject;
+class nsIDocShell;
+class nsPageSequenceFrame;
+class nsPIDOMWindowOuter;
+class nsView;
+
+namespace mozilla {
+class PresShell;
+namespace dom {
+class Document;
+class PrintPreviewResultInfo;
+}  // namespace dom
+}  // namespace mozilla
+
+/**
+ * A print job may be instantiated either for printing to an actual physical
+ * printer, or for creating a print preview.
+ */
+class nsPrintJob final : public nsIWebProgressListener,
+                         public nsSupportsWeakReference {
+  using Document = mozilla::dom::Document;
+  using PrintPreviewResolver =
+      std::function<void(const mozilla::dom::PrintPreviewResultInfo&)>;
+  using RemotePrintJobChild = mozilla::layout::RemotePrintJobChild;
+
+ public:
+  // nsISupports interface...
+  NS_DECL_ISUPPORTS
+
+  NS_DECL_NSIWEBPROGRESSLISTENER
+
+  /**
+   * Construct & initialize for printing, or for creating a print preview
+   * document.
+   *
+   * aDocViewerPrint owns us.
+   *
+   * When called in preparation for printing, aOriginalDoc is aDocViewerPrint's
+   * document.  The document/viewer may be for a sub-document (an iframe).
+   *
+   * When called in preparation for print preview, aOriginalDoc belongs to a
+   * different docViewer, in a different docShell, in a different TabGroup.
+   * In this case our aDocViewerPrint is the docViewer for the about:blank
+   * document in a new tab that the Firefox frontend code has created in
+   * preparation for PrintPreview to generate a print preview document in it.
+   *
+   * NOTE: In the case we're called for print preview, aOriginalDoc actually
+   * may not be the original document that the user selected to print.  It
+   * is not the actual original document in the case when the user chooses to
+   * display a simplified version of a print preview document.  In that
+   * instance the Firefox frontend code creates a second print preview tab,
+   * with a new docViewer and nsPrintJob, and passes the previous print preview
+   * document as aOriginalDoc (it doesn't want to pass the actual original
+   * document since it may have mutated)!
+   * TODO(dholbert): This^ note is probably somewhat out of date, in part
+   * because frontend code doesn't create "print preview tabs" anymore,
+   * now that we have a tab-modal print/print-preview dialog...
+   */
+  nsPrintJob(nsIDocumentViewerPrint& aDocViewerPrint, nsIDocShell& aDocShell,
+             Document& aOriginalDoc, float aScreenDPI);
+
+  // Our nsIWebBrowserPrint implementation (nsDocumentViewer) defers to the
+  // following methods.
+
+  /**
+   * May be called immediately after initialization, or after one or more
+   * PrintPreview calls.
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult
+  Print(Document& aSourceDoc, nsIPrintSettings* aPrintSettings,
+        RemotePrintJobChild* aRemotePrintJob,
+        nsIWebProgressListener* aWebProgressListener);
+
+  /**
+   * Generates a new print preview document and replaces our docViewer's
+   * document with it.  (Note that this breaks the normal invariant that a
+   * Document and its nsDocumentViewer have an unchanging 1:1 relationship.)
+   *
+   * This may be called multiple times on the same instance in order to
+   * recreate the print preview document to take account of settings that the
+   * user has changed in the print preview interface.  In this case aSourceDoc
+   * is actually our docViewer's current document!
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult
+  PrintPreview(Document& aSourceDoc, nsIPrintSettings* aPrintSettings,
+               nsIWebProgressListener* aWebProgressListener,
+               PrintPreviewResolver&& aCallback);
+
+  bool IsDoingPrint() const { return mIsDoingPrinting; }
+  bool CreatedForPrintPreview() const { return mCreatedForPrintPreview; }
+  /// If the returned value is not greater than zero, an error occurred.
+  int32_t GetRawNumPages() const;
+  // Returns whether the preview is empty due to page range exclusion.
+  bool GetIsEmpty() const;
+
+  // Returns the total number of PrintedSheetFrames (i.e. faces of a sheet of
+  // paper) for this print job. (This may be less than the raw number of pages,
+  // due to pages having been skipped in a page range or combined into a single
+  // sheet via pages-per-sheet.)
+  int32_t GetPrintPreviewNumSheets() const;
+
+  // The setters here also update the DocViewer
+  void SetIsPrinting(bool aIsPrinting);
+  bool GetIsPrinting() const { return mIsDoingPrinting; }
+  void SetIsPrintPreview(bool aIsPrintPreview);
+  bool GetIsCreatingPrintPreview() const { return mIsCreatingPrintPreview; }
+
+  std::tuple<nsPageSequenceFrame*, int32_t> GetSeqFrameAndCountSheets() const;
+
+  bool PrePrintSheet();
+  bool PrintSheet(nsPrintObject* aPOect, bool& aInRange);
+  bool DonePrintingSheets(nsPrintObject* aPO, nsresult aResult);
+
+  nsresult CleanupOnFailure(nsresult aResult, bool aIsPrinting);
+  // If FinishPrintPreview() fails, caller may need to reset the state of the
+  // object, for example by calling CleanupOnFailure().
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult FinishPrintPreview();
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void FirePrintingErrorEvent(nsresult aPrintError);
+
+  bool CheckBeforeDestroy() const;
+  nsresult Cancel();
+  void Destroy();
+  void DestroyPrintingData();
+
+ private:
+  nsPrintJob& operator=(const nsPrintJob& aOther) = delete;
+
+  ~nsPrintJob();
+
+  MOZ_CAN_RUN_SCRIPT nsresult DocumentReadyForPrinting();
+  MOZ_CAN_RUN_SCRIPT nsresult SetupToPrintContent();
+  nsresult EnablePOsForPrinting();
+
+  void BuildNestedPrintObjects(
+      const mozilla::UniquePtr<nsPrintObject>& aParentPO);
+
+  bool PrintDocContent(const mozilla::UniquePtr<nsPrintObject>& aPO,
+                       nsresult& aStatus);
+  nsresult DoPrint(const mozilla::UniquePtr<nsPrintObject>& aPO);
+
+  nsresult ReflowDocList(const mozilla::UniquePtr<nsPrintObject>& aPO);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  nsresult ReflowPrintObject(const mozilla::UniquePtr<nsPrintObject>& aPO);
+
+  void CalcNumPrintablePages(int32_t& aNumPages);
+
+  nsresult StartPagePrintTimer(const mozilla::UniquePtr<nsPrintObject>& aPO);
+
+  /// Customizes the behaviour of GetDisplayTitleAndURL.
+  enum class DocTitleDefault : uint32_t { eDocURLElseFallback, eFallback };
+
+  /**
+   * Gets the title and URL of the document for display in save-to-PDF dialogs,
+   * print spooler lists and page headers/footers.  This will get the title/URL
+   * from the PrintSettings, if set, otherwise it will get them from the
+   * document.
+   *
+   * For the title specifically, if a value is not provided by the settings
+   * object or the document then, if eDocURLElseFallback is passed, the document
+   * URL will be returned as the title if it's non-empty (which should always be
+   * the case).  Otherwise a non-empty fallback title will be returned.
+   */
+  static void GetDisplayTitleAndURL(Document& aDoc, nsIPrintSettings* aSettings,
+                                    DocTitleDefault aTitleDefault,
+                                    nsAString& aTitle, nsAString& aURLStr);
+
+  MOZ_CAN_RUN_SCRIPT nsresult CommonPrint(
+      bool aIsPrintPreview, nsIPrintSettings* aPrintSettings,
+      nsIWebProgressListener* aWebProgressListener, Document& aSourceDoc);
+
+  MOZ_CAN_RUN_SCRIPT nsresult DoCommonPrint(
+      bool aIsPrintPreview, nsIPrintSettings* aPrintSettings,
+      nsIWebProgressListener* aWebProgressListener, Document& aSourceDoc);
+
+  void FirePrintCompletionEvent();
+
+  void DisconnectPagePrintTimer();
+
+  /**
+   * This method is called to resume printing after all outstanding resources
+   * referenced by the static clone have finished loading.  (It is possibly
+   * called synchronously if there are no resources to load.)  While a static
+   * clone will generally just be able to reference the (already loaded)
+   * resources that the original document references, the static clone may
+   * reference additional resources that have not previously been loaded
+   * (if it has a 'print' style sheet, for example).
+   */
+  MOZ_CAN_RUN_SCRIPT nsresult
+  MaybeResumePrintAfterResourcesLoaded(bool aCleanupOnError);
+
+  bool ShouldResumePrint() const;
+
+  nsresult SetRootView(nsPrintObject* aPO, bool& aDoReturn,
+                       bool& aDocumentIsTopLevel, nsSize& aAdjSize);
+  nsView* GetParentViewForRoot();
+  void UpdateZoomRatio(nsPrintObject* aPO);
+  MOZ_CAN_RUN_SCRIPT nsresult ReconstructAndReflow();
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY nsresult UpdateSelectionAndShrinkPrintObject(
+      nsPrintObject* aPO, bool aDocumentIsTopLevel);
+  MOZ_CAN_RUN_SCRIPT nsresult InitPrintDocConstruction(bool aHandleError);
+  void FirePrintPreviewUpdateEvent();
+
+  void PageDone(nsresult aResult);
+
+  nsCOMPtr<nsIPrintSettings> mPrintSettings;
+
+  // The docViewer that owns us, and its docShell.
+  nsCOMPtr<nsIDocumentViewerPrint> mDocViewerPrint;
+  nsWeakPtr mDocShell;
+
+  WeakFrame mPageSeqFrame;
+
+  // We are the primary owner of our nsPrintData member vars.  These vars
+  // are refcounted so that functions (e.g. nsPrintData methods) can create
+  // temporary owning references when they need to fire a callback that
+  // could conceivably destroy this nsPrintJob owner object and all its
+  // member-data.
+  RefPtr<nsPrintData> mPrt;
+
+  RefPtr<nsPagePrintTimer> mPagePrintTimer;
+
+  // Only set if this nsPrintJob was created for a real print.
+  RefPtr<RemotePrintJobChild> mRemotePrintJob;
+
+  // The root print object.
+  mozilla::UniquePtr<nsPrintObject> mPrintObject;
+
+  // If there is a focused iframe, mSelectionRoot is set to its nsPrintObject.
+  // Otherwise, if there is a selection, it is set to the root nsPrintObject.
+  // Otherwise, it is unset.
+  nsPrintObject* mSelectionRoot = nullptr;
+
+  // Array of non-owning pointers to all the nsPrintObjects owned by this
+  // nsPrintJob. This includes mPrintObject, as well as all of its mKids (and
+  // their mKids, etc.)
+  nsTArray<nsPrintObject*> mPrintDocList;
+
+  // If the code that initiates a print preview passes a PrintPreviewResolver
+  // (a std::function) to be notified of the final sheet/page counts (once
+  // we've sufficiently laid out the document to know what those are), that
+  // callback is stored here.
+  PrintPreviewResolver mPrintPreviewCallback;
+
+  // The scale factor that would need to be applied to all pages to make the
+  // widest page fit without overflowing/clipping.
+  float mShrinkToFitFactor = 1.0f;
+
+  float mScreenDPI = 115.0f;
+
+  int32_t mNumPrintablePages = 0;
+
+  // Indicates if the page has a specific orientation from @page { size }.
+  // Stores true if this is landscape, false if this is portrait, or nothing
+  // if there is no page-size-orientation.
+  mozilla::Maybe<bool> mMaybeCSSPageLandscape;
+
+  // Indicates if the page has a specific size from @page { size }.
+  // Stores the page size if one was found.
+  mozilla::Maybe<nsSize> mMaybeCSSPageSize;
+
+  // If true, indicates that we have started Printing but have not gone to the
+  // timer to start printing the pages. It gets turned off right before we go
+  // to the timer.
+  bool mPreparingForPrint = false;
+
+  bool mCreatedForPrintPreview = false;
+  bool mIsCreatingPrintPreview = false;
+  bool mIsDoingPrinting = false;
+  bool mDidLoadDataForPrinting = false;
+  bool mShrinkToFit = false;
+  bool mDoingInitialReflow = false;
+  bool mIsDestroying = false;
+  bool mDisallowSelectionPrint = false;
+};
+
+#endif  // nsPrintJob_h
diff --git a/layout/printing/nsPrintObject.cpp b/layout/printing/nsPrintObject.cpp
new file mode 100644
index 0000000000..6bd49ca50d
--- /dev/null
+++ b/layout/printing/nsPrintObject.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsPrintObject.h"
+
+#include "nsIContentViewer.h"
+#include "nsContentUtils.h"  // for nsAutoScriptBlocker
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsPIDOMWindow.h"
+#include "nsPresContext.h"
+#include "nsGkAtoms.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIBaseWindow.h"
+#include "nsDocShell.h"
+
+#include "mozilla/PresShell.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+
+using namespace mozilla;
+using mozilla::dom::BrowsingContext;
+using mozilla::dom::Document;
+using mozilla::dom::Element;
+using mozilla::dom::Selection;
+
+//---------------------------------------------------
+//-- nsPrintObject Class Impl
+//---------------------------------------------------
+nsPrintObject::nsPrintObject(nsIDocShell& aDocShell, Document& aDoc,
+                             nsPrintObject* aParent)
+    : mDocShell(&aDocShell), mDocument(&aDoc), mParent(aParent) {
+  MOZ_COUNT_CTOR(nsPrintObject);
+  MOZ_ASSERT(aDoc.IsStaticDocument());
+
+  if (!aParent) {
+    // We are a root nsPrintObject.
+    // Ensure the document has no presentation.
+    DestroyPresentation();
+  } else {
+    // We are a nested nsPrintObject.
+    nsCOMPtr<nsPIDOMWindowOuter> window = aDoc.GetWindow();
+    mContent = window->GetFrameElementInternal();
+  }
+}
+
+nsPrintObject::~nsPrintObject() {
+  MOZ_COUNT_DTOR(nsPrintObject);
+
+  DestroyPresentation();
+  mDocShell = nullptr;
+  mTreeOwner = nullptr;  // mTreeOwner must be released after mDocShell;
+}
+
+//------------------------------------------------------------------
+// Resets PO by destroying the presentation
+void nsPrintObject::DestroyPresentation() {
+  if (mDocument) {
+    if (RefPtr<PresShell> ps = mDocument->GetPresShell()) {
+      MOZ_DIAGNOSTIC_ASSERT(!mPresShell || ps == mPresShell);
+      mPresShell = nullptr;
+      nsAutoScriptBlocker scriptBlocker;
+      ps->EndObservingDocument();
+      ps->Destroy();
+    }
+  }
+  mPresShell = nullptr;
+  mPresContext = nullptr;
+  mViewManager = nullptr;
+}
+
+void nsPrintObject::EnablePrinting(bool aEnable) {
+  mPrintingIsEnabled = aEnable;
+
+  for (const UniquePtr<nsPrintObject>& kid : mKids) {
+    kid->EnablePrinting(aEnable);
+  }
+}
+
+bool nsPrintObject::HasSelection() const {
+  return mDocument && mDocument->GetProperty(nsGkAtoms::printselectionranges);
+}
+
+void nsPrintObject::EnablePrintingSelectionOnly() {
+  mPrintingIsEnabled = HasSelection();
+
+  for (const UniquePtr<nsPrintObject>& kid : mKids) {
+    kid->EnablePrintingSelectionOnly();
+  }
+}
diff --git a/layout/printing/nsPrintObject.h b/layout/printing/nsPrintObject.h
new file mode 100644
index 0000000000..4c79bbbf0e
--- /dev/null
+++ b/layout/printing/nsPrintObject.h
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsPrintObject_h___
+#define nsPrintObject_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+
+// Interfaces
+#include "nsCOMPtr.h"
+#include "nsViewManager.h"
+#include "nsIDocShell.h"
+#include "nsIDocShellTreeOwner.h"
+
+class nsIContent;
+class nsPresContext;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+//---------------------------------------------------
+//-- nsPrintObject Class
+//---------------------------------------------------
+class nsPrintObject final {
+ public:
+  /**
+   * If aParent is nullptr (default), then this instance will be initialized as
+   * a "root" nsPrintObject.  Otherwise, this will be a "nested" nsPrintObject.
+   */
+  nsPrintObject(nsIDocShell& aDocShell, mozilla::dom::Document& aDoc,
+                nsPrintObject* aParent = nullptr);
+  ~nsPrintObject();
+
+  void DestroyPresentation();
+
+  /**
+   * Recursively sets all the PO items to be printed
+   * from the given item down into the tree
+   */
+  void EnablePrinting(bool aEnable);
+
+  /**
+   * Recursively sets all the PO items to be printed if they have a selection.
+   */
+  void EnablePrintingSelectionOnly();
+
+  bool PrintingIsEnabled() const { return mPrintingIsEnabled; }
+
+  bool HasSelection() const;
+
+  // Data Members
+  nsCOMPtr<nsIDocShell> mDocShell;
+  nsCOMPtr<nsIDocShellTreeOwner> mTreeOwner;
+  RefPtr<mozilla::dom::Document> mDocument;
+
+  RefPtr<nsPresContext> mPresContext;
+  RefPtr<mozilla::PresShell> mPresShell;
+  RefPtr<nsViewManager> mViewManager;
+
+  nsCOMPtr<nsIContent> mContent;
+
+  nsTArray<mozilla::UniquePtr<nsPrintObject>> mKids;
+  const nsPrintObject* mParent;  // This is a non-owning pointer.
+  bool mHasBeenPrinted = false;
+  bool mInvisible = false;  // Indicates PO is set to not visible by CSS
+
+  // The scale factor that sheets should be scaled by. This is either the
+  // explicit scale chosen by the user or else the shrink-to-fit scale factor
+  // if the user selects shrink-to-fit. Only set on the top-level nsPrintObject
+  // since this is only used by nsPageFrame (via nsPresContext::GetPageScale()).
+  float mZoomRatio = 1.0;
+
+  // If the user selects the shrink-to-fit option, the shrink-to-fit scale
+  // factor is calculated and stored here. Only set on the top-level
+  // nsPrintObject.
+  float mShrinkRatio = 1.0;
+
+ private:
+  nsPrintObject& operator=(const nsPrintObject& aOther) = delete;
+
+  bool mPrintingIsEnabled = false;
+};
+
+#endif /* nsPrintObject_h___ */