2 files changed, 18 insertions, 0 deletions
diff --git a/layout/generic/nsFrame.cpp b/layout/generic/nsFrame.cpp
index bbbb5c332..8d4ea8754 100644
--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -5557,6 +5557,19 @@ nsFrame::Reflow(nsPresContext*          aPresContext,
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
 }
 
+bool
+nsIFrame::IsContentDisabled() const
+{
+  // FIXME(emilio): Doing this via CSS means callers must ensure the style is up
+  // to date, and they don't!
+  if (StyleUserInterface()->mUserInput == StyleUserInput::None) {
+    return true;
+  }
+
+  auto* element = nsGenericHTMLElement::FromContentOrNull(GetContent());
+  return element && element->IsDisabled();
+}
+
 nsresult
 nsFrame::CharacterDataChanged(CharacterDataChangeInfo* aInfo)
 {
diff --git a/layout/generic/nsIFrame.h b/layout/generic/nsIFrame.h
index 57f5c460c..93eb95099 100644
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -2436,6 +2436,11 @@ public:
   nsIWidget* GetNearestWidget(nsPoint& aOffset) const;
 
   /**
+   * Whether the content for this frame is disabled, used for event handling.
+   */
+  bool IsContentDisabled() const;
+
+  /**
    * Get the "type" of the frame. May return nullptr.
    *
    * @see nsGkAtoms