mozilla-central/testing/web-platform/tests/conformance-checkers/html-aria/author-requirements/580.html

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>A div element with style="display:none" has aria-hidden="true", and then script sets style to "display: block".</title>
<script>
function replaceStyle (/* Element */ element, /* String */ selector, /* String */ newValue) {
element.setAttribute ('style', selector + ':' + newValue);
if (newValue == 'block')
element.setAttribute ('aria-hidden', 'false');
else if (newValue == 'none')
element.setAttribute ('aria-hidden', 'true');
}
</script>
</head>
<body>
<div id="test" aria-hidden="true" style="display:none;">This &lt;div&gt;'s style switched from 'display:none' to 'display:block'. It's <code>aria-hidden</code> was simultaneously switched to 'false'.</div>
<p>
<button onclick="replaceStyle (document.getElementById ('test'), 'display', 'block')" type="button">Change to 'display:block'</button>
<button onclick="replaceStyle (document.getElementById ('test'), 'display', 'none')" type="button">Change to 'display:none'</button>
<button onclick="window.location.reload()" type="button">Reload Page</button>
</p>
</body>
</html>