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<html>
<script>
function sizeResizer() {
// reference resizer
var img = document.getElementsByTagName("img")[0];
// hidden textarea
var textarea = document.getElementsByTagName("textarea")[0];
var width = 200 - textarea.clientWidth;
var height = 200 - textarea.clientHeight;
// (Leave test failing if a scrollbar is missing)
if (width != 0 && height != 0) {
img.style.width = width + "px";
img.style.left = textarea.clientWidth + "px";
img.style.height = height + "px";
img.style.top = textarea.clientHeight + "px";
}
}
</script>
<body onload="sizeResizer()">
<textarea style="width: 200px; height: 200px; margin: 0; border: none;
background: red; font-size: 400px;">
M
</textarea>
<div style="position: relative; top: -200px;
width: 200px; height: 200px; margin: 0; border: none;
background: lightgreen">
<img style="position: relative;" src="chrome://global/skin/icons/resizer.svg">
</div>
</body>
</html>
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