--- a/layout/generic/nsTextFrame.cpp
+++ b/layout/generic/nsTextFrame.cpp
@@ -6213,27 +6213,28 @@ nsTextFrame::PaintTextWithSelection(gfxC
   DestroySelectionDetails(details);
   return true;
 }
 
 void
 nsTextFrame::DrawEmphasisMarks(gfxContext* aContext, WritingMode aWM,
                                const gfxPoint& aTextBaselinePt,
                                uint32_t aOffset, uint32_t aLength,
+                               const nscolor* aDecorationOverrideColor,
                                PropertyProvider& aProvider)
 {
   auto info = static_cast<const EmphasisMarkInfo*>(
     Properties().Get(EmphasisMarkProperty()));
   if (!info) {
     MOZ_ASSERT(!StyleText()->HasTextEmphasis());
     return;
   }
 
-  nscolor color = nsLayoutUtils::
-    GetColor(this, eCSSProperty_text_emphasis_color);
+  nscolor color = aDecorationOverrideColor ? *aDecorationOverrideColor :
+    nsLayoutUtils::GetColor(this, eCSSProperty_text_emphasis_color);
   aContext->SetColor(Color::FromABGR(color));
   gfxPoint pt(aTextBaselinePt);
   if (!aWM.IsVertical()) {
     pt.y += info->baselineOffset;
   } else {
     if (aWM.IsVerticalRL()) {
       pt.x -= info->baselineOffset;
     } else {
@@ -6742,17 +6743,18 @@ nsTextFrame::DrawTextRunAndDecorations(
     }
 
     // CSS 2.1 mandates that text be painted after over/underlines, and *then*
     // line-throughs
     DrawTextRun(aCtx, aTextBaselinePt, aOffset, aLength, aProvider, aTextColor,
                 aAdvanceWidth, aDrawSoftHyphen, aContextPaint, aCallbacks);
 
     // Emphasis marks
-    DrawEmphasisMarks(aCtx, wm, aTextBaselinePt, aOffset, aLength, aProvider);
+    DrawEmphasisMarks(aCtx, wm, aTextBaselinePt, aOffset, aLength,
+                      aDecorationOverrideColor, aProvider);
 
     // Line-throughs
     for (uint32_t i = aDecorations.mStrikes.Length(); i-- > 0; ) {
       const LineDecoration& dec = aDecorations.mStrikes[i];
       if (dec.mStyle == NS_STYLE_TEXT_DECORATION_STYLE_NONE) {
         continue;
       }
 

--- a/layout/generic/nsTextFrame.h
+++ b/layout/generic/nsTextFrame.h
@@ -441,16 +441,17 @@ public:
                                      SelectionDetails* aDetails,
                                      SelectionType aSelectionType,
                                      DrawPathCallbacks* aCallbacks);
 
   void DrawEmphasisMarks(gfxContext* aContext,
                          mozilla::WritingMode aWM,
                          const gfxPoint& aTextBaselinePt,
                          uint32_t aOffset, uint32_t aLength,
+                         const nscolor* aDecorationOverrideColor,
                          PropertyProvider& aProvider);
 
   virtual nscolor GetCaretColorAt(int32_t aOffset) override;
 
   int16_t GetSelectionStatus(int16_t* aSelectionFlags);
 
   int32_t GetContentOffset() const { return mContentOffset; }
   int32_t GetContentLength() const