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<!DOCTYPE html>
<html>
<head>
<style>
#testElem {
border: 1px solid black;
background: yellow;
contain: layout size;
width: 300px;
}
</style>
<script>
function go() {
/* trigger an incremental reflow.
* Note: elem.style is undefined for MathML elements, so we have
* to use setAttribute().
*/
testElem.setAttribute("style", "width:150px");
}
</script>
</head>
<body onload="go()">
<math>
<mtable id="testElem">Change my size</mtable>
</math>
</body>
</html>
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