chrome/test/data/prerender/prerender_visibility_hidden_quick.html - Issue 7693029: Deflake PrerenderExcessiveMemory, fix race

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Side by Side Diff: chrome/test/data/prerender/prerender_visibility_hidden_quick.html

Issue 7693029: Deflake PrerenderExcessiveMemory, fix race (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/

Patch Set: Response to dominich's comments Created 9 years, 4 months ago

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	1 <html>

	2 <!--

	3 This test checks the visibility API when a prerendered page is visited without

	4 being displayed, before the page has finished loading.

	5 -->

	6 <head>

	7 <title>Prerender Visibility Hidden Quick Switch</title>

	8

	9 <script>

	10 // Checks visibility state while the page is still loading.

	11 var lastState = document.webkitVisibilityState;

	12 var loadingStatePassed = document.webkitHidden && lastState != 'visible';

	13 var unexpectedStateChange = false;

	14

	15 function onVisibilityChange(event) {

	16 if (lastState == 'hidden' \|\|

	17 document.webkitVisibilityState != 'hidden') {

	18 unexpectedStateChange = true;

	19 return;

	20 }

	21 lastState = document.webkitVisibilityState;

	22 }

	23

	24 document.addEventListener('webkitvisibilitychange',

	25 onVisibilityChange,

	26 false);

	27

	28 // Checks that either the first visibility state was 'prerender' and there

	29 // was one and only one visibility change event to 'hidden', or visibility

	30 // was always 'hidden'.

	31 function DidDisplayPass() {

	32 return loadingStatePassed &&

	33 !unexpectedStateChange &&

	34 'hidden' == document.webkitVisibilityState &&

	35 document.webkitHidden;

	36 }

	37 </script>

	38

	39 </head>

	40 <body></body>

	41 </html>

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