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chromium/third_party/blink/web_tests/compositing/iframes/resources/repaint-after-losing-scrollbars-iframe.html 

<!DOCTYPE html>
<style>
body {
will-change:transform;
width:10px;
height:10px;
position:absolute;
}

.tall {
height:200px;
}

.wide {
width:200px;
}
</style>
<body></body>