1 files changed, 110 insertions, 0 deletions
diff --git a/dom/html/HTMLTemplateElement.cpp b/dom/html/HTMLTemplateElement.cpp
new file mode 100644
index 0000000000..2a608f1c50
--- /dev/null
+++ b/dom/html/HTMLTemplateElement.cpp
@@ -0,0 +1,110 @@
+/* -*- 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 "mozilla/dom/HTMLTemplateElement.h"
+#include "mozilla/dom/HTMLTemplateElementBinding.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/NameSpaceConstants.h"
+#include "mozilla/dom/ShadowRootBinding.h"
+#include "nsGenericHTMLElement.h"
+#include "nsGkAtoms.h"
+#include "nsStyleConsts.h"
+#include "nsAtom.h"
+
+NS_IMPL_NS_NEW_HTML_ELEMENT(Template)
+
+namespace mozilla::dom {
+
+static constexpr nsAttrValue::EnumTable kShadowRootModeTable[] = {
+    {"open", ShadowRootMode::Open},
+    {"closed", ShadowRootMode::Closed},
+    {nullptr, {}}};
+
+const nsAttrValue::EnumTable* kShadowRootModeDefault = &kShadowRootModeTable[2];
+
+HTMLTemplateElement::HTMLTemplateElement(
+    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
+    : nsGenericHTMLElement(std::move(aNodeInfo)) {
+  SetHasWeirdParserInsertionMode();
+
+  Document* contentsOwner = OwnerDoc()->GetTemplateContentsOwner();
+  if (!contentsOwner) {
+    MOZ_CRASH("There should always be a template contents owner.");
+  }
+
+  mContent = contentsOwner->CreateDocumentFragment();
+  mContent->SetHost(this);
+}
+
+HTMLTemplateElement::~HTMLTemplateElement() {
+  if (mContent && mContent->GetHost() == this) {
+    mContent->SetHost(nullptr);
+  }
+}
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(HTMLTemplateElement,
+                                               nsGenericHTMLElement)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLTemplateElement)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLTemplateElement,
+                                                nsGenericHTMLElement)
+  if (tmp->mContent) {
+    if (tmp->mContent->GetHost() == tmp) {
+      tmp->mContent->SetHost(nullptr);
+    }
+    tmp->mContent = nullptr;
+  }
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLTemplateElement,
+                                                  nsGenericHTMLElement)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_ELEMENT_CLONE(HTMLTemplateElement)
+
+JSObject* HTMLTemplateElement::WrapNode(JSContext* aCx,
+                                        JS::Handle<JSObject*> aGivenProto) {
+  return HTMLTemplateElement_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void HTMLTemplateElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
+                                       const nsAttrValue* aValue,
+                                       const nsAttrValue* aOldValue,
+                                       nsIPrincipal* aMaybeScriptedPrincipal,
+                                       bool aNotify) {
+  if (aNamespaceID == kNameSpaceID_None && aName == nsGkAtoms::shadowrootmode &&
+      aValue && aValue->Type() == nsAttrValue::ValueType::eEnum &&
+      !mShadowRootMode.isSome()) {
+    mShadowRootMode.emplace(
+        static_cast<ShadowRootMode>(aValue->GetEnumValue()));
+  }
+
+  nsGenericHTMLElement::AfterSetAttr(aNamespaceID, aName, aValue, aOldValue,
+                                     aMaybeScriptedPrincipal, aNotify);
+}
+
+bool HTMLTemplateElement::ParseAttribute(int32_t aNamespaceID,
+                                         nsAtom* aAttribute,
+                                         const nsAString& aValue,
+                                         nsIPrincipal* aMaybeScriptedPrincipal,
+                                         nsAttrValue& aResult) {
+  if (aNamespaceID == kNameSpaceID_None &&
+      aAttribute == nsGkAtoms::shadowrootmode) {
+    return aResult.ParseEnumValue(aValue, kShadowRootModeTable, false, nullptr);
+  }
+  return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
+                                              aMaybeScriptedPrincipal, aResult);
+}
+
+void HTMLTemplateElement::SetHTMLUnsafe(const nsAString& aHTML) {
+  RefPtr<DocumentFragment> content = mContent;
+  nsContentUtils::SetHTMLUnsafe(content, this, aHTML);
+}
+
+}  // namespace mozilla::dom