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diff --git a/layout/reftests/forms/textarea/resize-background-ref.html b/layout/reftests/forms/textarea/resize-background-ref.html
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+++ b/layout/reftests/forms/textarea/resize-background-ref.html
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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.png">
+</div>
+</body>
+</html>