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diff --git a/layout/style/StyleSheetInfo.h b/layout/style/StyleSheetInfo.h
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+/* -*- 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_StyleSheetInfo_h
+#define mozilla_StyleSheetInfo_h
+
+#include "mozilla/css/SheetParsingMode.h"
+#include "mozilla/dom/SRIMetadata.h"
+#include "mozilla/CORSMode.h"
+
+#include "nsIReferrerInfo.h"
+
+class nsIPrincipal;
+class nsIURI;
+
+namespace mozilla {
+class StyleSheet;
+struct StyleUseCounters;
+struct StyleStylesheetContents;
+struct URLExtraData;
+
+/**
+ * Struct for data common to CSSStyleSheetInner and ServoStyleSheet.
+ */
+struct StyleSheetInfo final {
+  using ReferrerPolicy = dom::ReferrerPolicy;
+
+  StyleSheetInfo(CORSMode aCORSMode, const dom::SRIMetadata& aIntegrity,
+                 css::SheetParsingMode aParsingMode);
+
+  // FIXME(emilio): aCopy should be const.
+  StyleSheetInfo(StyleSheetInfo& aCopy, StyleSheet* aPrimarySheet);
+
+  ~StyleSheetInfo();
+
+  StyleSheetInfo* CloneFor(StyleSheet* aPrimarySheet);
+
+  void AddSheet(StyleSheet* aSheet);
+  void RemoveSheet(StyleSheet* aSheet);
+
+  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
+
+  // FIXME(emilio): most of this struct should be const, then we can remove the
+  // duplication with the UrlExtraData member and such.
+  nsCOMPtr<nsIURI> mSheetURI;          // for error reports, etc.
+  nsCOMPtr<nsIURI> mOriginalSheetURI;  // for GetHref.  Can be null.
+  nsCOMPtr<nsIURI> mBaseURI;           // for resolving relative URIs
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  const CORSMode mCORSMode;
+  // The ReferrerInfo of a stylesheet is used for its child sheets and loads
+  // come from this stylesheet, so it is stored here.
+  nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
+  dom::SRIMetadata mIntegrity;
+
+  // Pointer to the list of child sheets. This is all fundamentally broken,
+  // because each of the child sheets has a unique parent... We can only hope
+  // (and currently this is the case) that any time page JS can get its hands on
+  // a child sheet that means we've already ensured unique infos throughout its
+  // parent chain and things are good.
+  nsTArray<RefPtr<StyleSheet>> mChildren;
+
+  AutoTArray<StyleSheet*, 8> mSheets;
+
+  // If a SourceMap or X-SourceMap response header is seen, this is
+  // the value.  If both are seen, SourceMap is preferred.  If neither
+  // is seen, this will be an empty string.
+  nsCString mSourceMapURL;
+
+  RefPtr<const StyleStylesheetContents> mContents;
+
+  UniquePtr<StyleUseCounters> mUseCounters;
+
+  // XXX We already have mSheetURI, mBaseURI, and mPrincipal.
+  //
+  // Can we somehow replace them with URLExtraData directly? The issue
+  // is currently URLExtraData is immutable, but URIs in StyleSheetInfo
+  // seems to be mutable, so we probably cannot set them altogether.
+  // Also, this is mostly a duplicate reference of the same url data
+  // inside RawServoStyleSheet. We may want to just use that instead.
+  RefPtr<URLExtraData> mURLData;
+
+#ifdef DEBUG
+  bool mPrincipalSet = false;
+#endif
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_StyleSheetInfo_h