Bug 1686603 Part 2 - Add StyleSizeOverrides parameter to ReflowInput's constructor & co. to override data from style system data. r=dholbert

This patch adds the struct as a parameter to various functions. The struct is cached in ReflowInput so that we don't need to pass it down to the internal method where nsIFrame::ComputeSize() is called. In the subsequent patches, we'll use it to revise the implementation of flex container's flex base size resolution, and size overrides. Differential Revision: https://phabricator.services.mozilla.com/D101793
2021-01-26 02:47:40 +00:00 · 2021-01-26 02:47:40 +00:00 · a43cae175a
--- a/layout/forms/nsCheckboxRadioFrame.cpp
+++ b/layout/forms/nsCheckboxRadioFrame.cpp
@ -67,7 +67,8 @@ nscoord nsCheckboxRadioFrame::GetPrefISize(gfxContext* aRenderingContext) {
 LogicalSize nsCheckboxRadioFrame::ComputeAutoSize(
    gfxContext* aRC, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  LogicalSize size(aWM, 0, 0);
  if (!StyleDisplay()->HasAppearance()) {
    return size;
@ -75,7 +76,8 @@ LogicalSize nsCheckboxRadioFrame::ComputeAutoSize(

  // Note: this call always set the BSize to NS_UNCONSTRAINEDSIZE.
  size = nsAtomicContainerFrame::ComputeAutoSize(
-      aRC, aWM, aCBSize, aAvailableISize, aMargin, aBorderPadding, aFlags);
+      aRC, aWM, aCBSize, aAvailableISize, aMargin, aBorderPadding,
+      aSizeOverrides, aFlags);
  size.BSize(aWM) = DefaultSize();
  return size;
 }
--- a/layout/forms/nsCheckboxRadioFrame.h
+++ b/layout/forms/nsCheckboxRadioFrame.h
@ -48,11 +48,12 @@ class nsCheckboxRadioFrame final : public nsAtomicContainerFrame,
  /**
   * Our auto size is just intrinsic width and intrinsic height.
   */
-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  /**
--- a/layout/forms/nsMeterFrame.cpp
+++ b/layout/forms/nsMeterFrame.cpp
@ -187,7 +187,8 @@ nsresult nsMeterFrame::AttributeChanged(int32_t aNameSpaceID,
 LogicalSize nsMeterFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  RefPtr<nsFontMetrics> fontMet =
      nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);

--- a/layout/forms/nsMeterFrame.h
+++ b/layout/forms/nsMeterFrame.h
@ -53,6 +53,7 @@ class nsMeterFrame final : public nsContainerFrame,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
--- a/layout/forms/nsProgressFrame.cpp
+++ b/layout/forms/nsProgressFrame.cpp
@ -204,7 +204,8 @@ nsresult nsProgressFrame::AttributeChanged(int32_t aNameSpaceID,
 LogicalSize nsProgressFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  const WritingMode wm = GetWritingMode();
  LogicalSize autoSize(wm);
  autoSize.BSize(wm) = autoSize.ISize(wm) =
--- a/layout/forms/nsProgressFrame.h
+++ b/layout/forms/nsProgressFrame.h
@ -58,6 +58,7 @@ class nsProgressFrame final : public nsContainerFrame,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
--- a/layout/forms/nsRangeFrame.cpp
+++ b/layout/forms/nsRangeFrame.cpp
@ -610,7 +610,8 @@ static mozilla::Length OneEm(nsRangeFrame* aFrame) {
 LogicalSize nsRangeFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  bool isInlineOriented = IsInlineOriented();
  auto em = OneEm(this);

--- a/layout/forms/nsRangeFrame.h
+++ b/layout/forms/nsRangeFrame.h
@ -71,11 +71,12 @@ class nsRangeFrame final : public nsContainerFrame,
  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
                                    int32_t aModType) override;

-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
--- a/layout/forms/nsTextControlFrame.cpp
+++ b/layout/forms/nsTextControlFrame.cpp
@ -560,7 +560,8 @@ nscoord nsTextControlFrame::GetMinISize(gfxContext* aRenderingContext) {
 LogicalSize nsTextControlFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  float inflation = nsLayoutUtils::FontSizeInflationFor(this);
  LogicalSize autoSize = CalcIntrinsicSize(aRenderingContext, aWM, inflation);

@ -573,16 +574,16 @@ LogicalSize nsTextControlFrame::ComputeAutoSize(
      // fall back to nsContainerFrame's ComputeAutoSize to handle that.
      // XXX maybe a font-inflation issue here? (per the assertion below).
      autoSize.ISize(aWM) =
-          nsContainerFrame::ComputeAutoSize(aRenderingContext, aWM, aCBSize,
-                                            aAvailableISize, aMargin,
-                                            aBorderPadding, aFlags)
+          nsContainerFrame::ComputeAutoSize(
+              aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
+              aBorderPadding, aSizeOverrides, aFlags)
              .ISize(aWM);
    }
 #ifdef DEBUG
    else {
      LogicalSize ancestorAutoSize = nsContainerFrame::ComputeAutoSize(
          aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
-          aBorderPadding, aFlags);
+          aBorderPadding, aSizeOverrides, aFlags);
      // Disabled when there's inflation; see comment in GetXULPrefSize.
      MOZ_ASSERT(inflation != 1.0f ||
                     ancestorAutoSize.ISize(aWM) == autoSize.ISize(aWM),
--- a/layout/forms/nsTextControlFrame.h
+++ b/layout/forms/nsTextControlFrame.h
@ -70,6 +70,7 @@ class nsTextControlFrame : public nsContainerFrame,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
--- a/layout/generic/BlockReflowInput.cpp
+++ b/layout/generic/BlockReflowInput.cpp
@ -621,7 +621,7 @@ static nscoord FloatMarginISize(const ReflowInput& aCBReflowInput,
      aCBReflowInput.mRenderingContext, wm, aCBReflowInput.ComputedSize(wm),
      aFloatAvailableISize,
      aFloatOffsetState.ComputedLogicalMargin(wm).Size(wm),
-      aFloatOffsetState.ComputedLogicalBorderPadding(wm).Size(wm),
+      aFloatOffsetState.ComputedLogicalBorderPadding(wm).Size(wm), {},
      ComputeSizeFlag::ShrinkWrap);

  WritingMode cbwm = aCBReflowInput.GetWritingMode();
--- a/layout/generic/ReflowInput.cpp
+++ b/layout/generic/ReflowInput.cpp
@ -156,7 +156,9 @@ ReflowInput::ReflowInput(nsPresContext* aPresContext,
                         const ReflowInput& aParentReflowInput,
                         nsIFrame* aFrame, const LogicalSize& aAvailableSpace,
                         const Maybe<LogicalSize>& aContainingBlockSize,
-                         InitFlags aFlags, ComputeSizeFlags aComputeSizeFlags)
+                         InitFlags aFlags,
+                         const StyleSizeOverrides& aSizeOverrides,
+                         ComputeSizeFlags aComputeSizeFlags)
    : SizeComputationInput(aFrame, aParentReflowInput.mRenderingContext),
      mParentReflowInput(&aParentReflowInput),
      mFloatManager(aParentReflowInput.mFloatManager),
@ -169,6 +171,7 @@ ReflowInput::ReflowInput(nsPresContext* aPresContext,
              ? aParentReflowInput.mPercentBSizeObserver
              : nullptr),
      mFlags(aParentReflowInput.mFlags),
+      mStyleSizeOverrides(aSizeOverrides),
      mComputeSizeFlags(aComputeSizeFlags),
      mReflowDepth(aParentReflowInput.mReflowDepth + 1),
      mAvailableSize(aAvailableSpace) {
@ -1620,7 +1623,7 @@ void ReflowInput::InitAbsoluteConstraints(nsPresContext* aPresContext,
        cbSize.ConvertTo(wm, cbwm).ISize(wm),  // XXX or AvailableISize()?
        ComputedLogicalMargin(wm).Size(wm) +
            ComputedLogicalOffsets(wm).Size(wm),
-        ComputedLogicalBorderPadding(wm).Size(wm), mComputeSizeFlags);
+        ComputedLogicalBorderPadding(wm).Size(wm), {}, mComputeSizeFlags);
    ComputedISize() = sizeResult.mLogicalSize.ISize(wm);
    ComputedBSize() = sizeResult.mLogicalSize.BSize(wm);
    NS_ASSERTION(ComputedISize() >= 0, "Bogus inline-size");
@ -2346,10 +2349,11 @@ void ReflowInput::InitConstraints(
        cbSize.ISize(wm) = AvailableISize();
      }

-      auto size = mFrame->ComputeSize(
-          mRenderingContext, wm, cbSize, AvailableISize(),
-          ComputedLogicalMargin(wm).Size(wm),
-          ComputedLogicalBorderPadding(wm).Size(wm), mComputeSizeFlags);
+      auto size =
+          mFrame->ComputeSize(mRenderingContext, wm, cbSize, AvailableISize(),
+                              ComputedLogicalMargin(wm).Size(wm),
+                              ComputedLogicalBorderPadding(wm).Size(wm),
+                              mStyleSizeOverrides, mComputeSizeFlags);

      ComputedISize() = size.mLogicalSize.ISize(wm);
      ComputedBSize() = size.mLogicalSize.BSize(wm);
--- a/layout/generic/ReflowInput.h
+++ b/layout/generic/ReflowInput.h
@ -30,7 +30,20 @@ class nsReflowStatus;

 namespace mozilla {
 enum class LayoutFrameType : uint8_t;
-}
+
+/**
+ * A set of StyleSizes used as an input parameter to various functions that
+ * compute sizes like nsIFrame::ComputeSize(). If any of the member fields has a
+ * value, the function may use the value instead of retrieving it from the
+ * frame's style.
+ *
+ * The logical sizes are assumed to be in the associated frame's writing-mode.
+ */
+struct StyleSizeOverrides {
+  Maybe<StyleSize> mStyleISize;
+  Maybe<StyleSize> mStyleBSize;
+};
+}  // namespace mozilla

 /**
 * @return aValue clamped to [aMinValue, aMaxValue].
@ -512,6 +525,9 @@ struct ReflowInput : public SizeComputationInput {
    bool mIsBSizeSetByAspectRatio : 1;
  };
  Flags mFlags;
+
+  mozilla::StyleSizeOverrides mStyleSizeOverrides;
+
  mozilla::ComputeSizeFlags mComputeSizeFlags;

  // This value keeps track of how deeply nested a given reflow input
@ -612,6 +628,8 @@ struct ReflowInput : public SizeComputationInput {
   *        Init() instead.
   * @param aFlags A set of flags used for additional boolean parameters (see
   *        InitFlags above).
+   * @param aStyleSizeOverrides The style data used to override mFrame's when we
+   *        call nsIFrame::ComputeSize() internally.
   * @param aComputeSizeFlags A set of flags used when we call
   *        nsIFrame::ComputeSize() internally.
   */
@ -621,6 +639,7 @@ struct ReflowInput : public SizeComputationInput {
              const mozilla::Maybe<mozilla::LogicalSize>& aContainingBlockSize =
                  mozilla::Nothing(),
              InitFlags aFlags = {},
+              const mozilla::StyleSizeOverrides& aSizeOverrides = {},
              mozilla::ComputeSizeFlags aComputeSizeFlags = {});

  /**
--- a/layout/generic/nsBackdropFrame.cpp
+++ b/layout/generic/nsBackdropFrame.cpp
@ -49,7 +49,8 @@ void nsBackdropFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
 LogicalSize nsBackdropFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Note that this frame is a child of the viewport frame.
  LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
  if (aFlags.contains(ComputeSizeFlag::ShrinkWrap)) {
--- a/layout/generic/nsBackdropFrame.h
+++ b/layout/generic/nsBackdropFrame.h
@ -25,11 +25,12 @@ class nsBackdropFrame final : public nsIFrame {
      nsIFrame** aProviderFrame) const override;
  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                const nsDisplayListSet& aLists) override;
-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;
  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@ -7411,7 +7411,7 @@ void nsBlockFrame::ReflowOutsideMarker(nsIFrame* aMarkerFrame,
  availSize.BSize(markerWM) = NS_UNCONSTRAINEDSIZE;

  ReflowInput reflowInput(aState.mPresContext, ri, aMarkerFrame, availSize,
-                          Nothing(), {}, {ComputeSizeFlag::ShrinkWrap});
+                          Nothing(), {}, {}, {ComputeSizeFlag::ShrinkWrap});
  nsReflowStatus status;
  aMarkerFrame->Reflow(aState.mPresContext, aMetrics, reflowInput, status);

--- a/layout/generic/nsContainerFrame.cpp
+++ b/layout/generic/nsContainerFrame.cpp
@ -977,7 +977,8 @@ void nsContainerFrame::DoInlineIntrinsicISize(gfxContext* aRenderingContext,
 LogicalSize nsContainerFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const mozilla::LogicalSize& aBorderPadding,
+    const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) {
  LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
  nscoord availBased =
      aAvailableISize - aMargin.ISize(aWM) - aBorderPadding.ISize(aWM);
@ -2390,7 +2391,8 @@ LogicalSize nsContainerFrame::ComputeSizeWithIntrinsicDimensions(
    gfxContext* aRenderingContext, WritingMode aWM,
    const IntrinsicSize& aIntrinsicSize, const AspectRatio& aAspectRatio,
    const LogicalSize& aCBSize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  const nsStylePosition* stylePos = StylePosition();
  const auto* inlineStyleCoord = &stylePos->ISize(aWM);
  const auto* blockStyleCoord = &stylePos->BSize(aWM);
--- a/layout/generic/nsContainerFrame.h
+++ b/layout/generic/nsContainerFrame.h
@ -225,6 +225,7 @@ class nsContainerFrame : public nsSplittableFrame {
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  /**
@ -872,6 +873,7 @@ class nsContainerFrame : public nsSplittableFrame {
      const mozilla::AspectRatio& aAspectRatio,
      const mozilla::LogicalSize& aCBSize, const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags);

  // Compute tight bounds assuming this frame honours its border, background
--- a/layout/generic/nsFirstLetterFrame.cpp
+++ b/layout/generic/nsFirstLetterFrame.cpp
@ -129,7 +129,8 @@ nscoord nsFirstLetterFrame::GetPrefISize(gfxContext* aRenderingContext) {
 nsIFrame::SizeComputationResult nsFirstLetterFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  if (GetPrevInFlow()) {
    // We're wrapping the text *after* the first letter, so behave like an
    // inline frame.
@ -138,7 +139,7 @@ nsIFrame::SizeComputationResult nsFirstLetterFrame::ComputeSize(
  }
  return nsContainerFrame::ComputeSize(aRenderingContext, aWM, aCBSize,
                                       aAvailableISize, aMargin, aBorderPadding,
-                                       aFlags);
+                                       aSizeOverrides, aFlags);
 }

 void nsFirstLetterFrame::Reflow(nsPresContext* aPresContext,
--- a/layout/generic/nsFirstLetterFrame.h
+++ b/layout/generic/nsFirstLetterFrame.h
@ -47,13 +47,13 @@ class nsFirstLetterFrame final : public nsContainerFrame {
  virtual void AddInlinePrefISize(gfxContext* aRenderingContext,
                                  InlinePrefISizeData* aData) override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/generic/nsFlexContainerFrame.cpp
+++ b/layout/generic/nsFlexContainerFrame.cpp
@ -1597,7 +1597,7 @@ void nsFlexContainerFrame::ResolveAutoFlexBasisAndMinSize(
            aItemReflowInput.mContainingBlockSize, availISize,
            aItemReflowInput.ComputedLogicalMargin(itemWM).Size(itemWM),
            aItemReflowInput.ComputedLogicalBorderPadding(itemWM).Size(itemWM),
-            {ComputeSizeFlag::UseAutoISize, ComputeSizeFlag::ShrinkWrap});
+            {}, {ComputeSizeFlag::UseAutoISize, ComputeSizeFlag::ShrinkWrap});

        contentSizeSuggestion = aAxisTracker.MainComponent(
            sizeInItemWM.mLogicalSize.ConvertTo(cbWM, itemWM));
--- a/layout/generic/nsGridContainerFrame.cpp
+++ b/layout/generic/nsGridContainerFrame.cpp
@ -4984,7 +4984,7 @@ static nscoord MeasuringReflow(nsIFrame* aChild,
  } else {
    aChild->RemoveProperty(nsIFrame::BClampMarginBoxMinSizeProperty());
  }
-  ReflowInput childRI(pc, *rs, aChild, aAvailableSize, Some(aCBSize), {},
+  ReflowInput childRI(pc, *rs, aChild, aAvailableSize, Some(aCBSize), {}, {},
                      csFlags);

  // Because we pass ComputeSizeFlag::UseAutoBSize, and the
@ -5036,7 +5036,7 @@ static void PostReflowStretchChild(
    aChild->RemoveProperty(nsIFrame::BClampMarginBoxMinSizeProperty());
  }
  ReflowInput ri(pc, aReflowInput, aChild, aAvailableSize, Some(aCBSize), {},
-                 csFlags);
+                 {}, csFlags);
  if (aChildAxis == eLogicalAxisBlock) {
    ri.SetComputedBSize(ri.ApplyMinMaxBSize(aNewContentBoxSize));
  } else {
@ -7245,7 +7245,7 @@ void nsGridContainerFrame::ReflowInFlowChild(
  }
  LogicalSize percentBasis(cb.Size(wm).ConvertTo(childWM, wm));
  ReflowInput childRI(pc, *aState.mReflowInput, aChild, childCBSize,
-                      Some(percentBasis), {}, csFlags);
+                      Some(percentBasis), {}, {}, csFlags);
  childRI.mFlags.mIsTopOfPage =
      aFragmentainer ? aFragmentainer->mIsTopOfPage : false;

--- a/layout/generic/nsHTMLCanvasFrame.cpp
+++ b/layout/generic/nsHTMLCanvasFrame.cpp
@ -404,10 +404,11 @@ AspectRatio nsHTMLCanvasFrame::GetIntrinsicRatio() const {
 nsIFrame::SizeComputationResult nsHTMLCanvasFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  return {ComputeSizeWithIntrinsicDimensions(
              aRenderingContext, aWM, GetIntrinsicSize(), GetAspectRatio(),
-              aCBSize, aMargin, aBorderPadding, aFlags),
+              aCBSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
          AspectRatioUsage::None};
 }

--- a/layout/generic/nsHTMLCanvasFrame.h
+++ b/layout/generic/nsHTMLCanvasFrame.h
@ -69,13 +69,13 @@ class nsHTMLCanvasFrame final : public nsContainerFrame {
  virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
  mozilla::AspectRatio GetIntrinsicRatio() const override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/generic/nsIFrame.cpp
+++ b/layout/generic/nsIFrame.cpp
@ -6076,13 +6076,14 @@ static MinMaxSize ComputeTransferredMinMaxInlineSize(
 nsIFrame::SizeComputationResult nsIFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  MOZ_ASSERT(!GetIntrinsicRatio(),
             "Please override this method and call "
             "nsContainerFrame::ComputeSizeWithIntrinsicDimensions instead.");
  LogicalSize result =
      ComputeAutoSize(aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
-                      aBorderPadding, aFlags);
+                      aBorderPadding, aSizeOverrides, aFlags);
  const nsStylePosition* stylePos = StylePosition();
  const nsStyleDisplay* disp = StyleDisplay();
  auto aspectRatioUsage = AspectRatioUsage::None;
@ -6431,7 +6432,8 @@ LogicalSize nsIFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM,
    const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
    const mozilla::LogicalSize& aMargin,
-    const mozilla::LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const mozilla::LogicalSize& aBorderPadding,
+    const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) {
  // Use basic shrink-wrapping as a default implementation.
  LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);

@ -10682,7 +10684,7 @@ void nsIFrame::BoxReflow(nsBoxLayoutState& aState, nsPresContext* aPresContext,
            ComputeSize(
                aRenderingContext, wm, logicalSize, logicalSize.ISize(wm),
                reflowInput.ComputedLogicalMargin(wm).Size(wm),
-                reflowInput.ComputedLogicalBorderPadding(wm).Size(wm), {})
+                reflowInput.ComputedLogicalBorderPadding(wm).Size(wm), {}, {})
                .mLogicalSize.Height(wm));
      }
    }
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@ -2741,6 +2741,9 @@ class nsIFrame : public nsQueryFrame {
   * @param aBorderPadding  The sum of the frame's inline / block border-widths
   *                        and padding (including actual values resulting from
   *                        percentage padding values).
+   * @param aSizeOverride Optional override values for size properties, which
+   *                      this function will use internally instead of the
+   *                      actual property values.
   * @param aFlags   Flags to further customize behavior (definitions in
   *                 LayoutConstants.h).
   *
@ -2767,6 +2770,7 @@ class nsIFrame : public nsQueryFrame {
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags);

 protected:
@ -2780,15 +2784,21 @@ class nsIFrame : public nsQueryFrame {
   * should override only ComputeAutoSize, and frames that cannot do so need to
   * override ComputeSize to enforce their inline-size/block-size invariants.
   *
-   * Implementations may optimize by returning a garbage width if
-   * StylePosition()->ISize() is not 'auto', and likewise for BSize(), since in
-   * such cases the result is guaranteed to be unused.
+   * Implementations may optimize by returning a garbage inline-size if
+   * StylePosition()->ISize() is not 'auto' (or inline-size override in
+   * aSizeOverrides is not 'auto' if provided), and likewise for BSize(), since
+   * in such cases the result is guaranteed to be unused.
+   *
+   * Most of the frame are not expected to check the aSizeOverrides parameter
+   * apart from checking the inline size override for 'auto' if they want to
+   * optimize and return garbage inline-size.
   */
  virtual mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags);

  /**
--- a/layout/generic/nsImageFrame.cpp
+++ b/layout/generic/nsImageFrame.cpp
@ -962,11 +962,12 @@ void nsImageFrame::EnsureIntrinsicSizeAndRatio() {
 nsIFrame::SizeComputationResult nsImageFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  EnsureIntrinsicSizeAndRatio();
  return {ComputeSizeWithIntrinsicDimensions(
              aRenderingContext, aWM, mIntrinsicSize, GetAspectRatio(), aCBSize,
-              aMargin, aBorderPadding, aFlags),
+              aMargin, aBorderPadding, aSizeOverrides, aFlags),
          AspectRatioUsage::None};
 }

--- a/layout/generic/nsImageFrame.h
+++ b/layout/generic/nsImageFrame.h
@ -215,13 +215,13 @@ class nsImageFrame : public nsAtomicContainerFrame, public nsIReflowCallback {
    return !HasAnyStateBits(NS_FRAME_FIRST_REFLOW);
  }

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) final;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) final;

  bool IsServerImageMap();

--- a/layout/generic/nsInlineFrame.cpp
+++ b/layout/generic/nsInlineFrame.cpp
@ -243,7 +243,8 @@ void nsInlineFrame::AddInlinePrefISize(gfxContext* aRenderingContext,
 nsIFrame::SizeComputationResult nsInlineFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Inlines and text don't compute size before reflow.
  return {LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
          AspectRatioUsage::None};
--- a/layout/generic/nsInlineFrame.h
+++ b/layout/generic/nsInlineFrame.h
@ -76,13 +76,13 @@ class nsInlineFrame : public nsContainerFrame {
                                 InlineMinISizeData* aData) override;
  virtual void AddInlinePrefISize(gfxContext* aRenderingContext,
                                  InlinePrefISizeData* aData) override;
-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
  virtual nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const override;
  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/generic/nsLeafFrame.cpp
+++ b/layout/generic/nsLeafFrame.cpp
@ -42,7 +42,8 @@ nscoord nsLeafFrame::GetPrefISize(gfxContext* aRenderingContext) {
 LogicalSize nsLeafFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  const WritingMode wm = GetWritingMode();
  LogicalSize result(wm, GetIntrinsicISize(), GetIntrinsicBSize());
  return result.ConvertTo(aWM, wm);
--- a/layout/generic/nsLeafFrame.h
+++ b/layout/generic/nsLeafFrame.h
@ -37,11 +37,12 @@ class nsLeafFrame : public nsIFrame {
  /**
   * Our auto size is just intrinsic width and intrinsic height.
   */
-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  /**
--- a/layout/generic/nsRubyBaseContainerFrame.cpp
+++ b/layout/generic/nsRubyBaseContainerFrame.cpp
@ -251,7 +251,8 @@ bool nsRubyBaseContainerFrame::CanContinueTextRun() const { return true; }
 nsIFrame::SizeComputationResult nsRubyBaseContainerFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Ruby base container frame is inline,
  // hence don't compute size before reflow.
  return {LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
--- a/layout/generic/nsRubyBaseContainerFrame.h
+++ b/layout/generic/nsRubyBaseContainerFrame.h
@ -35,13 +35,13 @@ class nsRubyBaseContainerFrame final : public nsContainerFrame {
                                 InlineMinISizeData* aData) override;
  virtual void AddInlinePrefISize(gfxContext* aRenderingContext,
                                  InlinePrefISizeData* aData) override;
-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus& aStatus) override;
--- a/layout/generic/nsSubDocumentFrame.cpp
+++ b/layout/generic/nsSubDocumentFrame.cpp
@ -671,11 +671,12 @@ AspectRatio nsSubDocumentFrame::GetIntrinsicRatio() const {
 LogicalSize nsSubDocumentFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  if (!IsInline()) {
    return nsIFrame::ComputeAutoSize(aRenderingContext, aWM, aCBSize,
                                     aAvailableISize, aMargin, aBorderPadding,
-                                     aFlags);
+                                     aSizeOverrides, aFlags);
  }

  const WritingMode wm = GetWritingMode();
@ -687,10 +688,11 @@ LogicalSize nsSubDocumentFrame::ComputeAutoSize(
 nsIFrame::SizeComputationResult nsSubDocumentFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  return {ComputeSizeWithIntrinsicDimensions(
              aRenderingContext, aWM, GetIntrinsicSize(), GetAspectRatio(),
-              aCBSize, aMargin, aBorderPadding, aFlags),
+              aCBSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
          AspectRatioUsage::None};
 }

--- a/layout/generic/nsSubDocumentFrame.h
+++ b/layout/generic/nsSubDocumentFrame.h
@ -69,15 +69,16 @@ class nsSubDocumentFrame final : public nsAtomicContainerFrame,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;

  void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
              const ReflowInput& aReflowInput,
--- a/layout/generic/nsTextFrame.cpp
+++ b/layout/generic/nsTextFrame.cpp
@ -8676,7 +8676,8 @@ void nsTextFrame::AddInlinePrefISize(gfxContext* aRenderingContext,
 nsIFrame::SizeComputationResult nsTextFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Inlines and text don't compute size before reflow.
  return {LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
          AspectRatioUsage::None};
--- a/layout/generic/nsTextFrame.h
+++ b/layout/generic/nsTextFrame.h
@ -398,13 +398,13 @@ class nsTextFrame : public nsIFrame {
                         InlineMinISizeData* aData) override;
  void AddInlinePrefISize(gfxContext* aRenderingContext,
                          InlinePrefISizeData* aData) override;
-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) final;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) final;
  nsRect ComputeTightBounds(DrawTarget* aDrawTarget) const final;
  nsresult GetPrefWidthTightBounds(gfxContext* aContext, nscoord* aX,
                                   nscoord* aXMost) final;
--- a/layout/generic/nsVideoFrame.cpp
+++ b/layout/generic/nsVideoFrame.cpp
@ -556,16 +556,17 @@ nsresult nsVideoFrame::GetFrameName(nsAString& aResult) const {
 nsIFrame::SizeComputationResult nsVideoFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  if (!HasVideoElement()) {
-    return nsContainerFrame::ComputeSize(aRenderingContext, aWM, aCBSize,
-                                         aAvailableISize, aMargin,
-                                         aBorderPadding, aFlags);
+    return nsContainerFrame::ComputeSize(
+        aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
+        aBorderPadding, aSizeOverrides, aFlags);
  }

  return {ComputeSizeWithIntrinsicDimensions(
              aRenderingContext, aWM, GetIntrinsicSize(), GetAspectRatio(),
-              aCBSize, aMargin, aBorderPadding, aFlags),
+              aCBSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
          AspectRatioUsage::None};
 }

--- a/layout/generic/nsVideoFrame.h
+++ b/layout/generic/nsVideoFrame.h
@ -57,13 +57,13 @@ class nsVideoFrame final : public nsContainerFrame,
  nsSize GetVideoIntrinsicSize() const;
  mozilla::IntrinsicSize GetIntrinsicSize() override;
  mozilla::AspectRatio GetIntrinsicRatio() const override;
-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
  nscoord GetMinISize(gfxContext* aRenderingContext) override;
  nscoord GetPrefISize(gfxContext* aRenderingContext) override;
  void DestroyFrom(nsIFrame* aDestructRoot,
--- a/layout/mathml/nsMathMLSelectedFrame.cpp
+++ b/layout/mathml/nsMathMLSelectedFrame.cpp
@ -80,7 +80,8 @@ void nsMathMLSelectedFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
 nsIFrame::SizeComputationResult nsMathMLSelectedFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    // Delegate size computation to the child frame.
@ -94,7 +95,8 @@ nsIFrame::SizeComputationResult nsMathMLSelectedFrame::ComputeSize(
    const auto bpSize = offsetState.ComputedLogicalBorderPadding(aWM).Size(aWM);
    auto size = childFrame->ComputeSize(
        aRenderingContext, aWM, cbSize, availableISize,
-        offsetState.ComputedLogicalMargin(aWM).Size(aWM), bpSize, aFlags);
+        offsetState.ComputedLogicalMargin(aWM).Size(aWM), bpSize,
+        aSizeOverrides, aFlags);
    return {size.mLogicalSize + bpSize, size.mAspectRatioUsage};
  }
  return {LogicalSize(aWM), AspectRatioUsage::None};
--- a/layout/mathml/nsMathMLSelectedFrame.h
+++ b/layout/mathml/nsMathMLSelectedFrame.h
@ -27,13 +27,13 @@ class nsMathMLSelectedFrame : public nsMathMLContainerFrame {
  virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
                         ReflowOutput& aDesiredSize) override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/svg/SVGOuterSVGFrame.cpp
+++ b/layout/svg/SVGOuterSVGFrame.cpp
@ -291,7 +291,7 @@ nsIFrame::SizeComputationResult SVGOuterSVGFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWritingMode,
    const LogicalSize& aCBSize, nscoord aAvailableISize,
    const LogicalSize& aMargin, const LogicalSize& aBorderPadding,
-    ComputeSizeFlags aFlags) {
+    const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) {
  if (IsRootOfImage() || mIsInObjectOrEmbed) {
    // The embedding element has sized itself using the CSS replaced element
    // sizing rules, using our intrinsic dimensions as necessary. The SVG spec
@ -353,7 +353,7 @@ nsIFrame::SizeComputationResult SVGOuterSVGFrame::ComputeSize(

  return {ComputeSizeWithIntrinsicDimensions(
              aRenderingContext, aWritingMode, intrinsicSize, GetAspectRatio(),
-              cbSize, aMargin, aBorderPadding, aFlags),
+              cbSize, aMargin, aBorderPadding, aSizeOverrides, aFlags),
          AspectRatioUsage::None};
 }

--- a/layout/svg/SVGOuterSVGFrame.h
+++ b/layout/svg/SVGOuterSVGFrame.h
@ -62,13 +62,12 @@ class SVGOuterSVGFrame final : public SVGDisplayContainerFrame,
  virtual IntrinsicSize GetIntrinsicSize() override;
  AspectRatio GetIntrinsicRatio() const override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    WritingMode aWritingMode,
-                                    const LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const LogicalSize& aMargin,
-                                    const LogicalSize& aBorderPadding,
-                                    ComputeSizeFlags aFlags) override;
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, WritingMode aWritingMode,
+      const LogicalSize& aCBSize, nscoord aAvailableISize,
+      const LogicalSize& aMargin, const LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
--- a/layout/tables/nsTableFrame.cpp
+++ b/layout/tables/nsTableFrame.cpp
@ -1523,10 +1523,11 @@ nsTableFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis) {
 nsIFrame::SizeComputationResult nsTableFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
-  auto result = nsContainerFrame::ComputeSize(aRenderingContext, aWM, aCBSize,
-                                              aAvailableISize, aMargin,
-                                              aBorderPadding, aFlags);
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
+  auto result = nsContainerFrame::ComputeSize(
+      aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin, aBorderPadding,
+      aSizeOverrides, aFlags);

  // XXX The code below doesn't make sense if the caller's writing mode
  // is orthogonal to this frame's. Not sure yet what should happen then;
@ -1580,7 +1581,8 @@ nscoord nsTableFrame::TableShrinkISizeToFit(gfxContext* aRenderingContext,
 LogicalSize nsTableFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Tables always shrink-wrap.
  nscoord cbBased =
      aAvailableISize - aMargin.ISize(aWM) - aBorderPadding.ISize(aWM);
--- a/layout/tables/nsTableFrame.h
+++ b/layout/tables/nsTableFrame.h
@ -295,19 +295,20 @@ class nsTableFrame : public nsContainerFrame {
  IntrinsicSizeOffsetData IntrinsicISizeOffsets(
      nscoord aPercentageBasis = NS_UNCONSTRAINEDSIZE) override;

-  SizeComputationResult ComputeSize(gfxContext* aRenderingContext,
-                                    mozilla::WritingMode aWM,
-                                    const mozilla::LogicalSize& aCBSize,
-                                    nscoord aAvailableISize,
-                                    const mozilla::LogicalSize& aMargin,
-                                    const mozilla::LogicalSize& aBorderPadding,
-                                    mozilla::ComputeSizeFlags aFlags) override;
-
-  virtual mozilla::LogicalSize ComputeAutoSize(
+  SizeComputationResult ComputeSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
+
+  mozilla::LogicalSize ComputeAutoSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  /**
--- a/layout/tables/nsTableWrapperFrame.cpp
+++ b/layout/tables/nsTableWrapperFrame.cpp
@ -360,7 +360,7 @@ nscoord nsTableWrapperFrame::GetPrefISize(gfxContext* aRenderingContext) {
 nscoord nsTableWrapperFrame::ChildShrinkWrapISize(
    gfxContext* aRenderingContext, nsIFrame* aChildFrame, WritingMode aWM,
    LogicalSize aCBSize, nscoord aAvailableISize,
-    nscoord* aMarginResult) const {
+    const StyleSizeOverrides& aSizeOverrides, nscoord* aMarginResult) const {
  AutoMaybeDisableFontInflation an(aChildFrame);

  SizeComputationInput offsets(aChildFrame, aRenderingContext, aWM,
@ -384,7 +384,7 @@ nscoord nsTableWrapperFrame::ChildShrinkWrapISize(

  auto size =
      aChildFrame->ComputeSize(aRenderingContext, aWM, aCBSize, aAvailableISize,
-                               marginSize, bpSize, flags);
+                               marginSize, bpSize, aSizeOverrides, flags);
  if (aMarginResult) {
    *aMarginResult = offsets.ComputedLogicalMargin(aWM).IStartEnd(aWM);
  }
@ -396,7 +396,8 @@ nscoord nsTableWrapperFrame::ChildShrinkWrapISize(
 LogicalSize nsTableWrapperFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  nscoord kidAvailableISize = aAvailableISize - aMargin.ISize(aWM);
  NS_ASSERTION(aBorderPadding.IsAllZero(),
               "Table wrapper frames cannot have borders or paddings");
@ -410,24 +411,27 @@ LogicalSize nsTableWrapperFrame::ComputeAutoSize(
  uint8_t captionSide = GetCaptionSide();
  nscoord inlineSize;
  if (captionSide == NO_SIDE) {
-    inlineSize = ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM,
-                                      aCBSize, kidAvailableISize);
+    inlineSize =
+        ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM, aCBSize,
+                             kidAvailableISize, aSizeOverrides);
  } else if (captionSide == NS_STYLE_CAPTION_SIDE_LEFT ||
             captionSide == NS_STYLE_CAPTION_SIDE_RIGHT) {
    nscoord capISize =
        ChildShrinkWrapISize(aRenderingContext, mCaptionFrames.FirstChild(),
-                             aWM, aCBSize, kidAvailableISize);
-    inlineSize = capISize +
-                 ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM,
-                                      aCBSize, kidAvailableISize - capISize);
+                             aWM, aCBSize, kidAvailableISize, aSizeOverrides);
+    inlineSize =
+        capISize +
+        ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM, aCBSize,
+                             kidAvailableISize - capISize, aSizeOverrides);
  } else if (captionSide == NS_STYLE_CAPTION_SIDE_TOP ||
             captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM) {
    nscoord margin;
-    inlineSize = ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM,
-                                      aCBSize, kidAvailableISize, &margin);
+    inlineSize =
+        ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM, aCBSize,
+                             kidAvailableISize, aSizeOverrides, &margin);
    nscoord capISize =
        ChildShrinkWrapISize(aRenderingContext, mCaptionFrames.FirstChild(),
-                             aWM, aCBSize, inlineSize - margin);
+                             aWM, aCBSize, inlineSize - margin, aSizeOverrides);
    if (capISize > inlineSize) {
      inlineSize = capISize;
    }
@ -435,11 +439,12 @@ LogicalSize nsTableWrapperFrame::ComputeAutoSize(
    NS_ASSERTION(captionSide == NS_STYLE_CAPTION_SIDE_TOP_OUTSIDE ||
                     captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM_OUTSIDE,
                 "unexpected caption-side");
-    inlineSize = ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM,
-                                      aCBSize, kidAvailableISize);
+    inlineSize =
+        ChildShrinkWrapISize(aRenderingContext, InnerTableFrame(), aWM, aCBSize,
+                             kidAvailableISize, aSizeOverrides);
    nscoord capISize =
        ChildShrinkWrapISize(aRenderingContext, mCaptionFrames.FirstChild(),
-                             aWM, aCBSize, kidAvailableISize);
+                             aWM, aCBSize, kidAvailableISize, aSizeOverrides);
    if (capISize > inlineSize) {
      inlineSize = capISize;
    }
--- a/layout/tables/nsTableWrapperFrame.h
+++ b/layout/tables/nsTableWrapperFrame.h
@ -92,11 +92,12 @@ class nsTableWrapperFrame : public nsContainerFrame {
  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;

-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  /** process a reflow command for the table.
@ -266,11 +267,12 @@ class nsTableWrapperFrame : public nsContainerFrame {
   * If aMarginResult is non-null, fill it with the part of the
   * margin-isize that was contributed by the margin.
   */
-  nscoord ChildShrinkWrapISize(gfxContext* aRenderingContext,
-                               nsIFrame* aChildFrame, mozilla::WritingMode aWM,
-                               mozilla::LogicalSize aCBSize,
-                               nscoord aAvailableISize,
-                               nscoord* aMarginResult = nullptr) const;
+  nscoord ChildShrinkWrapISize(
+      gfxContext* aRenderingContext, nsIFrame* aChildFrame,
+      mozilla::WritingMode aWM, mozilla::LogicalSize aCBSize,
+      nscoord aAvailableISize,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      nscoord* aMarginResult = nullptr) const;

 private:
  nsFrameList mCaptionFrames;
--- a/layout/xul/nsLeafBoxFrame.cpp
+++ b/layout/xul/nsLeafBoxFrame.cpp
@ -116,11 +116,12 @@ nscoord nsLeafBoxFrame::GetIntrinsicISize() {
 LogicalSize nsLeafBoxFrame::ComputeAutoSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
-    const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) {
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
  // Important: NOT calling our direct superclass here!
  return nsIFrame::ComputeAutoSize(aRenderingContext, aWM, aCBSize,
                                   aAvailableISize, aMargin, aBorderPadding,
-                                   aFlags);
+                                   aSizeOverrides, aFlags);
 }

 void nsLeafBoxFrame::Reflow(nsPresContext* aPresContext,
--- a/layout/xul/nsLeafBoxFrame.h
+++ b/layout/xul/nsLeafBoxFrame.h
@ -44,11 +44,12 @@ class nsLeafBoxFrame : public nsLeafFrame {
  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;

  // Our auto size is that provided by nsFrame, not nsLeafFrame
-  virtual mozilla::LogicalSize ComputeAutoSize(
+  mozilla::LogicalSize ComputeAutoSize(
      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
      const mozilla::LogicalSize& aMargin,
      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
      mozilla::ComputeSizeFlags aFlags) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,