Make ancestors of modal <dialog> inert

LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html

Index: LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html
diff --git a/LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html b/LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html
index 2d1ec448391803cd3861469ab821cbfb315eae3f..d715f2e95f1163a39a68fe184e7d84de0210ef08 100644
--- a/LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html
+++ b/LayoutTests/fast/dom/HTMLDialogElement/modal-dialog-blocks-mouse-events.html
@@ -77,24 +77,24 @@ eventFiredOnDialog = function(event) {
         dialogDiv.style.backgroundColor = 'green';
 };
 
-body = document.body;
-body.firedOnEvents = {};
-eventFiredOnBody = function(event) {
-    body.firedOnEvents[event.type] = true;
-    if (Object.keys(body.firedOnEvents).length == events.length && !inertDiv.firedOn)
+document.firedOnEvents = {};
+document.expectedEventCount = events.length - 1; // document won't get 'mouseout'

[esprehn, 2014/01/14 01:43:29]

Why are you storing these properties on the document and now in the window? It's
really weird to add these expandos.

[falken, 2014/01/14 01:50:48]

Seemed a bit nicer to say document.expectedEventCount than
expectedEventCountForDocument etc, but I'll move them to window.

+eventFiredOnDocument = function(event) {
+    document.firedOnEvents[event.type] = true;
+    if (Object.keys(document.firedOnEvents).length == document.expectedEventCount && !inertDiv.firedOn)
         inertDiv.style.backgroundColor = 'green';
 };
 
 for (var i = 0; i < events.length; ++i) {
     inertDiv.addEventListener(events[i], eventFiredOnInertNode);
     dialogDiv.addEventListener(events[i], eventFiredOnDialog);
-    document.body.addEventListener(events[i], eventFiredOnBody);
+    document.addEventListener(events[i], eventFiredOnDocument);
 }
 
 debug('Clicking on inert box');
 clickOn(inertDiv);
 shouldBeFalse('inertDiv.firedOn');
-shouldBe('Object.keys(body.firedOnEvents).length', 'events.length');
+shouldBe('Object.keys(document.firedOnEvents).length', 'document.expectedEventCount');
 
 debug('Clicking on non-inert box');
 clickOn(dialogDiv);