Implement the inert attribute

third_party/WebKit/LayoutTests/fast/dom/inert/inert-focus-in-frames.html

Index: third_party/WebKit/LayoutTests/fast/dom/inert/inert-focus-in-frames.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/HTMLDialogElement/inert-focus-in-frames.html b/third_party/WebKit/LayoutTests/fast/dom/inert/inert-focus-in-frames.html
similarity index 66%
copy from third_party/WebKit/LayoutTests/fast/dom/HTMLDialogElement/inert-focus-in-frames.html
copy to third_party/WebKit/LayoutTests/fast/dom/inert/inert-focus-in-frames.html
index 92fa36a096fcbb9097c487eeeb025dc1961c794e..c28649043a65190a2f32fd0ccf0bb634a0a37e0d 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/HTMLDialogElement/inert-focus-in-frames.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/inert/inert-focus-in-frames.html
@@ -8,12 +8,14 @@ if (window.testRunner)
     testRunner.waitUntilDone();
 </script>
 </head>
+<div inert>
 <iframe height=400 width=600 id="main-iframe">
 <frameset rows="*" cols="50,50">
     <frame src="resources/inert-focus-in-frames-frame1.html">
     <frame src='data:text/html,<div id="frame2-div" class="target" tabindex="0">Hello</div>'>
 </frameset>
 </iframe>
+</div>
 <script>
 framesLoaded = 0;
 numFrames = 4;
@@ -34,27 +36,11 @@ function testFocus(element, expectFocus) {
 }
 
 function test() {
-    debug('Opening a modal dialog in frame1. It blocks other nodes in its document.');
     var frame1 = mainIframe.contentWindow.frames[0].document;
-    frame1.querySelector('dialog').showModal();
-
     testFocus(frame1.querySelector('.target'), false);
     var iframe = frame1.querySelector('iframe').contentDocument;
     testFocus(iframe.querySelector('.target'), false);
 
-    debug('Even a modal dialog in the iframe is blocked by the modal dialog in the parent frame1.');
-    iframe.querySelector('dialog').showModal();
-    testFocus(iframe.querySelector('button'), false);
-
-    debug('A modal dialog does not block nodes in a sibling frame.');
-    var frame2 = mainIframe.contentWindow.frames[1].document;
-    testFocus(frame2.querySelector('.target'), true);
-
-    debug('Closing the dialog in frame1. The modal dialog in the iframe does not block nodes in its parent.');
-    frame1.querySelector('dialog').close();
-    testFocus(iframe.querySelector('.target'), false);
-    testFocus(frame1.querySelector('.target'), true);
-
     if (window.testRunner)
         testRunner.notifyDone();
 }