diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index fdd57616de65..b090e7cb5f5e 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -3676,6 +3676,51 @@ nsLayoutUtils::ComputeHeightDependentValue(
   return 0;
 }
 
+/* static */ void
+nsLayoutUtils::MarkDescendantsDirty(nsIFrame *aSubtreeRoot)
+{
+  nsAutoTArray<nsIFrame*, 4> subtrees;
+  subtrees.AppendElement(aSubtreeRoot);
+
+  // dirty descendants, iterating over subtrees that may include
+  // additional subtrees associated with placeholders
+  do {
+    nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
+    subtrees.RemoveElementAt(subtrees.Length() - 1);
+
+    // Mark all descendants dirty (using an nsTArray stack rather than
+    // recursion).
+    // Note that nsHTMLReflowState::InitResizeFlags has some similar
+    // code; see comments there for how and why it differs.
+    nsAutoTArray<nsIFrame*, 32> stack;
+    stack.AppendElement(subtreeRoot);
+
+    do {
+      nsIFrame *f = stack.ElementAt(stack.Length() - 1);
+      stack.RemoveElementAt(stack.Length() - 1);
+
+      f->MarkIntrinsicWidthsDirty();
+
+      if (f->GetType() == nsGkAtoms::placeholderFrame) {
+        nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
+        if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
+          // We have another distinct subtree we need to mark.
+          subtrees.AppendElement(oof);
+        }
+      }
+
+      nsIFrame::ChildListIterator lists(f);
+      for (; !lists.IsDone(); lists.Next()) {
+        nsFrameList::Enumerator childFrames(lists.CurrentList());
+        for (; !childFrames.AtEnd(); childFrames.Next()) {
+          nsIFrame* kid = childFrames.get();
+          stack.AppendElement(kid);
+        }
+      }
+    } while (stack.Length() != 0);
+  } while (subtrees.Length() != 0);
+}
+
 #define MULDIV(a,b,c) (nscoord(int64_t(a) * int64_t(b) / int64_t(c)))
 
 /* static */ nsSize
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index 77b6e9b5dea8..3f4a19582152 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -1210,6 +1210,8 @@ public:
             nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) == 0);
   }
 
+  static void MarkDescendantsDirty(nsIFrame *aSubtreeRoot);
+
   /*
    * Calculate the used values for 'width' and 'height' for a replaced element.
    *
diff --git a/layout/generic/nsFirstLetterFrame.cpp b/layout/generic/nsFirstLetterFrame.cpp
index 59a4afb3022c..c2a72ec3bcf2 100644
--- a/layout/generic/nsFirstLetterFrame.cpp
+++ b/layout/generic/nsFirstLetterFrame.cpp
@@ -85,6 +85,7 @@ nsFirstLetterFrame::SetInitialChildList(ChildListID  aListID,
   for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
     restyleManager->ReparentStyleContext(e.get());
+    nsLayoutUtils::MarkDescendantsDirty(e.get());
   }
 
   mFrames.SetFrames(aChildList);
diff --git a/layout/generic/nsInlineFrame.cpp b/layout/generic/nsInlineFrame.cpp
index d344871c9326..526041e63646 100644
--- a/layout/generic/nsInlineFrame.cpp
+++ b/layout/generic/nsInlineFrame.cpp
@@ -286,6 +286,7 @@ ReparentChildListStyle(nsPresContext* aPresContext,
   for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
     NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
     restyleManager->ReparentStyleContext(e.get());
+    nsLayoutUtils::MarkDescendantsDirty(e.get());
   }
 }
 
@@ -424,6 +425,7 @@ nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags,
         f->SetParent(this);
         if (inFirstLine) {
           restyleManager->ReparentStyleContext(f);
+          nsLayoutUtils::MarkDescendantsDirty(f);
         }
       }
     }
@@ -529,6 +531,7 @@ nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
         child->SetParent(this);
         if (inFirstLine) {
           restyleManager->ReparentStyleContext(child);
+          nsLayoutUtils::MarkDescendantsDirty(child);
         }
         // We also need to do the same for |frame|'s next-in-flows that are in
         // the sibling list. Otherwise, if we reflow |frame| and it's complete
@@ -563,6 +566,7 @@ nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
               nextInFlow->SetParent(this);
               if (inFirstLine) {
                 restyleManager->ReparentStyleContext(nextInFlow);
+                nsLayoutUtils::MarkDescendantsDirty(nextInFlow);
               }
             }
             else {
@@ -1005,6 +1009,7 @@ nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& i
     // style-context that we just pulled.
     NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?");
     aPresContext->RestyleManager()->ReparentStyleContext(frame);
+    nsLayoutUtils::MarkDescendantsDirty(frame);
   }
   return frame;
 }
diff --git a/layout/generic/nsTextFrame.cpp b/layout/generic/nsTextFrame.cpp
index db056162c54d..e4b85009af8f 100644
--- a/layout/generic/nsTextFrame.cpp
+++ b/layout/generic/nsTextFrame.cpp
@@ -4441,7 +4441,6 @@ nsTextFrame::CharacterDataChanged(CharacterDataChangeInfo* aInfo)
 nsTextFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
 {
   nsFrame::DidSetStyleContext(aOldStyleContext);
-  ClearTextRuns();
 }
 
 class nsDisplayTextGeometry : public nsDisplayItemGenericGeometry
diff --git a/layout/svg/SVGTextFrame.cpp b/layout/svg/SVGTextFrame.cpp
index 06c76093c0c3..a878b41ea1e5 100644
--- a/layout/svg/SVGTextFrame.cpp
+++ b/layout/svg/SVGTextFrame.cpp
@@ -3312,7 +3312,7 @@ SVGTextFrame::ScheduleReflowSVGNonDisplayText()
   MOZ_ASSERT(f, "should have found an ancestor frame to reflow");
 
   PresContext()->PresShell()->FrameNeedsReflow(
-    f, nsIPresShell::eResize, NS_FRAME_HAS_DIRTY_CHILDREN);
+    f, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
 }
 
 NS_IMPL_ISUPPORTS1(SVGTextFrame::MutationObserver, nsIMutationObserver)