Bug 1655722 - implement HTML:inert attribute r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D85190

dom/html/nsGenericHTMLElement.cpp

@@ -16,6 +16,7 @@
 #include "mozilla/MouseEvents.h"
 #include "mozilla/PresShell.h"
 #include "mozilla/TextEditor.h"
+#include "mozilla/StaticPrefs_html5.h"
 #include "mozilla/StaticPrefs_layout.h"
 
 #include "nscore.h"
@@ -687,6 +688,13 @@ nsresult nsGenericHTMLElement::AfterSetAttr(
         SetFlags(NODE_HAS_ACCESSKEY);
         RegAccessKey();
       }
+    } else if (aName == nsGkAtoms::inert &&
+               StaticPrefs::html5_inert_enabled()) {
+      if (aValue) {
+        AddStates(NS_EVENT_STATE_MOZINERT);
+      } else {
+        RemoveStates(NS_EVENT_STATE_MOZINERT);
+      }
     } else if (aName == nsGkAtoms::name) {
       if (aValue && !aValue->Equals(EmptyString(), eIgnoreCase)) {
         // This may not be quite right because we can have subclass code run

modules/libpref/init/StaticPrefList.yaml

@@ -4578,6 +4578,12 @@
 # Prefs starting with "html5."
 #---------------------------------------------------------------------------
 
+# Turn HTML:inert on or off.
+- name: html5.inert.enabled
+  type: bool
+  value: false
+  mirror: always
+
 # Toggle which thread the HTML5 parser uses for stream parsing.
 - name: html5.offmainthread
   type: bool

testing/web-platform/meta/inert/__dir__.ini

@@ -0,0 +1 @@
+prefs: [html5.inert.enabled:true]

testing/web-platform/meta/inert/inert-in-shadow-dom.tentative.html.ini

@@ -1,4 +0,0 @@
-[inert-in-shadow-dom.tentative.html]
-  [inert on Shadow host affects content in shadow]
-    expected: FAIL
-

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

@@ -1,4 +0,0 @@
-[inert-inlines.tentative.html]
-  [Tests that inert inlines do not receive mouse events. To test manually, click on all the "Click me"s. The test fails if you see red.]
-    expected: FAIL
-

testing/web-platform/meta/inert/inert-label-focus.tentative.html.ini

@@ -1,4 +0,0 @@
-[inert-label-focus.tentative.html]
-  [Calling focus() on a label for a control which is in an inert subtree should have no effect.]
-    expected: FAIL
-

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

@@ -5,12 +5,6 @@
   [Elements inside of inert subtrees return false when getting 'inert']
     expected: FAIL
 
-  [Button with inert atribute is unfocusable.]
-    expected: FAIL
-
-  [All focusable elements inside inert subtree are unfocusable]
-    expected: FAIL
-
   [Can get inert via property]
     expected: FAIL
 

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

@@ -1,5 +1,8 @@
 [inert-retargeting-iframe.tentative.html]
-  expected: ERROR
+  expected:
+    if (os == "win"): OK
+    if (os == "android"): OK
+    ERROR
 
   [Tests that any mouse event on an inert element is targeted to the nearest non-inert ancestor at the same coordinates]
     expected: FAIL
@@ -8,12 +11,16 @@
     disabled:
       if webrender and debug and (os == "linux"): wpt-sync Bug 1564668
     expected:
-      if debug and (os == "win"): ["PASS", "FAIL"]
+      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:
-      if os == "mac": FAIL
+      FAIL
 

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

@@ -8,9 +8,13 @@
 
   [Tests that any mouse event on a non-inert element is correctly targeted to that element]
     expected:
-      if (os == "linux") and webrender and not fission: ["PASS", "FAIL"]
+      FAIL
+
+  [Tests that any pointer event on a non-inert element is correctly targeted to that element]
+    expected:
+      FAIL
 
   [elementsFromPoint returns inert element]
     expected:
-      if os == "mac": FAIL
+      FAIL
 

xpcom/ds/StaticAtoms.py

@@ -532,6 +532,7 @@ STATIC_ATOMS = [
     Atom("indent", "indent"),
     Atom("indeterminate", "indeterminate"),
     Atom("index", "index"),
+    Atom("inert", "inert"),
     Atom("infinity", "infinity"),
     Atom("inherits", "inherits"),
     Atom("inheritOverflow", "inherit-overflow"),