9 files changed, 40 insertions, 14 deletions
diff --git a/dom/html/HTMLLabelElement.h b/dom/html/HTMLLabelElement.h
index 4057ffef6..c8385fc53 100644
--- a/dom/html/HTMLLabelElement.h
+++ b/dom/html/HTMLLabelElement.h
@@ -59,6 +59,8 @@ public:
   using nsGenericHTMLElement::Focus;
   virtual void Focus(mozilla::ErrorResult& aError) override;
 
+  virtual bool IsDisabled() const override { return false; }
+
   // nsIContent
   virtual nsresult PostHandleEvent(
                      EventChainPostVisitor& aVisitor) override;
diff --git a/dom/html/HTMLObjectElement.h b/dom/html/HTMLObjectElement.h
index 5226154da..4041b78a3 100644
--- a/dom/html/HTMLObjectElement.h
+++ b/dom/html/HTMLObjectElement.h
@@ -77,6 +77,8 @@ public:
   NS_IMETHOD Reset() override;
   NS_IMETHOD SubmitNamesValues(HTMLFormSubmission *aFormSubmission) override;
 
+  virtual bool IsDisabled() const override { return false; }
+
   virtual void DoneAddingChildren(bool aHaveNotified) override;
   virtual bool IsDoneAddingChildren() override;
 
diff --git a/dom/html/HTMLOptGroupElement.cpp b/dom/html/HTMLOptGroupElement.cpp
index 9e738961d..8a044fbf3 100644
--- a/dom/html/HTMLOptGroupElement.cpp
+++ b/dom/html/HTMLOptGroupElement.cpp
@@ -53,14 +53,15 @@ HTMLOptGroupElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
   aVisitor.mCanHandle = false;
   // Do not process any DOM events if the element is disabled
   // XXXsmaug This is not the right thing to do. But what is?
-  if (IsDisabled()) {
+  if (HasAttr(kNameSpaceID_None, nsGkAtoms::disabled)) {
     return NS_OK;
   }
 
-  if (nsIFrame* frame = GetPrimaryFrame()) {
-    // FIXME(emilio): This poking at the style of the frame is broken unless we
-    // flush before every event handling, which we don't really want to.
-    if (frame->StyleUserInterface()->mUserInput == StyleUserInput::None) {
+  nsIFrame* frame = GetPrimaryFrame();
+  if (frame) {
+    const nsStyleUserInterface* uiStyle = frame->StyleUserInterface();
+    if (uiStyle->mUserInput == StyleUserInput::None ||
+        uiStyle->mUserInput == StyleUserInput::Disabled) {
       return NS_OK;
     }
   }
diff --git a/dom/html/HTMLOptGroupElement.h b/dom/html/HTMLOptGroupElement.h
index e46a6a953..d53a2e32b 100644
--- a/dom/html/HTMLOptGroupElement.h
+++ b/dom/html/HTMLOptGroupElement.h
@@ -46,6 +46,10 @@ public:
 
   virtual nsIDOMNode* AsDOMNode() override { return this; }
 
+  virtual bool IsDisabled() const override {
+    return HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
+  }
+
   bool Disabled() const
   {
     return GetBoolAttr(nsGkAtoms::disabled);
diff --git a/dom/html/HTMLOptionElement.h b/dom/html/HTMLOptionElement.h
index 4b5e192ff..e220b84df 100644
--- a/dom/html/HTMLOptionElement.h
+++ b/dom/html/HTMLOptionElement.h
@@ -67,6 +67,10 @@ public:
 
   nsresult CopyInnerTo(mozilla::dom::Element* aDest);
 
+  virtual bool IsDisabled() const override {
+    return HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
+  }
+
   bool Disabled() const
   {
     return GetBoolAttr(nsGkAtoms::disabled);
diff --git a/dom/html/HTMLOutputElement.h b/dom/html/HTMLOutputElement.h
index 6b6c3f66c..588262480 100644
--- a/dom/html/HTMLOutputElement.h
+++ b/dom/html/HTMLOutputElement.h
@@ -35,6 +35,8 @@ public:
   NS_IMETHOD Reset() override;
   NS_IMETHOD SubmitNamesValues(HTMLFormSubmission* aFormSubmission) override;
 
+  virtual bool IsDisabled() const override { return false; }
+
   nsresult Clone(mozilla::dom::NodeInfo* aNodeInfo, nsINode** aResult) const override;
 
   bool ParseAttribute(int32_t aNamespaceID, nsIAtom* aAttribute,
diff --git a/dom/html/nsGenericHTMLElement.cpp b/dom/html/nsGenericHTMLElement.cpp
index 0c8bcc9c8..2f890325a 100644
--- a/dom/html/nsGenericHTMLElement.cpp
+++ b/dom/html/nsGenericHTMLElement.cpp
@@ -2109,6 +2109,14 @@ nsGenericHTMLFormElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
   return nsGenericHTMLElement::PreHandleEvent(aVisitor);
 }
 
+/* virtual */
+bool
+nsGenericHTMLFormElement::IsDisabled() const
+{
+  return HasAttr(kNameSpaceID_None, nsGkAtoms::disabled) ||
+         (mFieldSet && mFieldSet->IsDisabled());
+}
+
 void
 nsGenericHTMLFormElement::ForgetFieldSet(nsIContent* aFieldset)
 {
@@ -2300,13 +2308,14 @@ nsGenericHTMLFormElement::IsElementDisabledForEvents(EventMessage aMessage,
       break;
   }
 
-  // FIXME(emilio): This poking at the style of the frame is slightly bogus
-  // unless we flush before every event, which we don't really want to do.
-  if (aFrame &&
-      aFrame->StyleUserInterface()->mUserInput == StyleUserInput::None) {
-    return true;
+  bool disabled = IsDisabled();
+  if (!disabled && aFrame) {
+    const nsStyleUserInterface* uiStyle = aFrame->StyleUserInterface();
+    disabled = uiStyle->mUserInput == StyleUserInput::None ||
+               uiStyle->mUserInput == StyleUserInput::Disabled;
+
   }
-  return IsDisabled();
+  return disabled;
 }
 
 void
diff --git a/dom/html/nsGenericHTMLElement.h b/dom/html/nsGenericHTMLElement.h
index acbebe087..72039f266 100644
--- a/dom/html/nsGenericHTMLElement.h
+++ b/dom/html/nsGenericHTMLElement.h
@@ -817,8 +817,8 @@ public:
   /**
    * Returns the current disabled state of the element.
    */
-  bool IsDisabled() const {
-    return HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
+  virtual bool IsDisabled() const {
+    return false;
   }
 
   bool IsHidden() const
@@ -1222,6 +1222,8 @@ public:
   virtual nsresult PreHandleEvent(
                      mozilla::EventChainPreVisitor& aVisitor) override;
 
+  virtual bool IsDisabled() const override;
+
   /**
    * This callback is called by a fieldest on all its elements whenever its
    * disabled attribute is changed so the element knows its disabled state
diff --git a/dom/interfaces/base/nsIDOMWindowUtils.idl b/dom/interfaces/base/nsIDOMWindowUtils.idl
index fcfe407e8..70ec7e0ae 100644
--- a/dom/interfaces/base/nsIDOMWindowUtils.idl
+++ b/dom/interfaces/base/nsIDOMWindowUtils.idl
@@ -1786,7 +1786,7 @@ interface nsIDOMWindowUtils : nsISupports {
   /**
    * In certain cases the event handling of nodes, form controls in practice,
    * may be disabled. Such cases are for example the existence of disabled
-   * attribute or -moz-user-input: none.
+   * attribute or -moz-user-input: none/disabled.
    */
   boolean isNodeDisabledForEvents(in nsIDOMNode aNode);