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<html>
<head>
<title>Testcase bug - Crash [@ nsIFrame::IsThemed] when trying to get the computed style of a button in iframe</title>

<style>
iframe {
width: 800px;
height: 400px;
}
</style>
</head>
<body>
This page should not crash Mozilla<br>
<iframe id="content" src="data:text/html;charset=utf-8,%3Chtml%3E%3Chead%3E%3C/head%3E%3Cbody%3E%0A%3Cbutton%3E%3C/button%3E%0A%3C/body%3E%3C/html%3E"></iframe>

<script>
function getComputedStyles(){
var x=document.getElementById('content').contentDocument.getElementsByTagName('button')[0];
var style = document.defaultView.getComputedStyle(x, null).getPropertyValue('border-left-width');
}
setTimeout(getComputedStyles,300);
</script>

</body>
</html>