Bug 1655722 - add HTMLElement::inert property r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D82943

dom/html/nsGenericHTMLElement.h

@@ -86,6 +86,10 @@ class nsGenericHTMLElement : public nsGenericHTMLElementBase {
   void SetHidden(bool aHidden, mozilla::ErrorResult& aError) {
     SetHTMLBoolAttr(nsGkAtoms::hidden, aHidden, aError);
   }
+  bool Inert() const { return GetBoolAttr(nsGkAtoms::inert); }
+  void SetInert(bool aInert, mozilla::ErrorResult& aError) {
+    SetHTMLBoolAttr(nsGkAtoms::inert, aInert, aError);
+  }
   void Click(mozilla::dom::CallerType aCallerType);
   void GetAccessKey(nsString& aAccessKey) {
     GetHTMLAttr(nsGkAtoms::accesskey, aAccessKey);

dom/webidl/HTMLElement.webidl

@@ -31,6 +31,8 @@ interface HTMLElement : Element {
   // user interaction
   [CEReactions, SetterThrows, Pure]
            attribute boolean hidden;
+  [CEReactions, SetterThrows, Pure, Pref="html5.inert.enabled"]
+           attribute boolean inert;
   [NeedsCallerType]
   void click();
   [CEReactions, SetterThrows, Pure]

testing/web-platform/meta/inert/inert-node-is-unfocusable.tentative.html.ini

@@ -1,10 +0,0 @@
-[inert-node-is-unfocusable.tentative.html]
-  [Setting inert via property correctly modifies inert state]
-    expected: FAIL
-
-  [Elements inside of inert subtrees return false when getting 'inert']
-    expected: FAIL
-
-  [Can get inert via property]
-    expected: FAIL
-

testing/web-platform/meta/inert/inert-on-slots.tentative.html.ini

@@ -1,4 +0,0 @@
-[inert-on-slots.tentative.html]
-  [inert inside ShadowRoot affects slotted content]
-    expected: FAIL
-

testing/web-platform/meta/inert/inert-retargeting-iframe.tentative.html.ini

@@ -12,14 +12,10 @@
       if webrender and debug and (os == "linux"): wpt-sync Bug 1564668
     expected:
       if (os == "win"): ["PASS", "FAIL"]
-      if (os == "android"): FAIL
 
   [Tests that any pointer event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates]
     expected: FAIL
 
-  [Tests that any pointer event on a non-inert element is correctly targeted to that element]
-    expected: FAIL
-
   [elementsFromPoint returns inert element]
     expected:
       FAIL

testing/web-platform/meta/inert/inert-retargeting.tentative.html.ini

@@ -6,14 +6,6 @@
   [Tests that any pointer event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates]
     expected: FAIL
 
-  [Tests that any mouse event on a non-inert element is correctly targeted to that element]
-    expected:
-      FAIL
-
-  [Tests that any pointer event on a non-inert element is correctly targeted to that element]
-    expected:
-      FAIL
-
   [elementsFromPoint returns inert element]
     expected:
       FAIL