Bug 1355351 - Make pseudo-elements return the correct style via getComputedStyle

* Add a node property to access the ::before and ::after pseudo-elements
* Look for the frame for ::before and ::after pseudos
* Clean up pseudo-element props
* Simplify nsLayoutUtils callers, and make child iterators notice display: contents pseudos

Tag #1375

2 files changed, 6 insertions, 13 deletions

diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index 71f6172bd5..25b685fb28 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -10008,19 +10008,16 @@ nsIFrame::IsPseudoStackingContextFromStyle() {
 Element*
 nsIFrame::GetPseudoElement(CSSPseudoElementType aType)
 {
-  nsIFrame* frame = nullptr;
+  if (!mContent) {
+    return nullptr;
+  }
 
   if (aType == CSSPseudoElementType::before) {
-    frame = nsLayoutUtils::GetBeforeFrame(this);
-  } else if (aType == CSSPseudoElementType::after) {
-    frame = nsLayoutUtils::GetAfterFrame(this);
+    return nsLayoutUtils::GetBeforePseudo(mContent);
   }
 
-  if (frame) {
-    nsIContent* content = frame->GetContent();
-    if (content->IsElement()) {
-      return content->AsElement();
-    }
+  if (aType == CSSPseudoElementType::after) {
+    return nsLayoutUtils::GetAfterPseudo(mContent);
   }
 
   return nullptr;
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 3137aaee27..9372b15a2a 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -1062,10 +1062,6 @@ public:
     return GetBidiData().embeddingLevel;
   }
 
-  nsTArray<nsIContent*>* GetGenConPseudos() {
-    return GetProperty(GenConProperty());
-  }
-
   /**
    * Return the distance between the border edge of the frame and the
    * margin edge of the frame.  Like GetRect(), returns the dimensions