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+<!DOCTYPE html>
+<html>
+ <head>
+ <title>Test for Bug 1301290</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <style type="text/css">
+ .blue, .green {
+ border: none;
+ box-sizing: border-box;
+ display: block;
+ width: 200px;
+ height: 100px;
+ overflow: scroll;
+ resize: both;
+ }
+
+ .blue {
+ background: blue;
+ }
+
+ .green {
+ background: green;
+ margin-top: -100px;
+ }
+ </style>
+ </head>
+ <body>
+ <div class="blue"></div>
+ <textarea class="green" id="textarea"></textarea>
+ <script type="application/javascript">
+ SimpleTest.waitForExplicitFinish();
+ addLoadEvent(() => SimpleTest.executeSoon(function() {
+ var textarea = $("textarea");
+ var rect = textarea.getBoundingClientRect();
+
+ synthesizeMouse(textarea, rect.width - 10, rect.height - 10, { type: "mousedown" });
+ synthesizeMouse(textarea, rect.width + 40, rect.height + 40, { type: "mousemove" });
+ synthesizeMouse(textarea, rect.width + 40, rect.height + 40, { type: "mouseup" });
+
+ var newrect = textarea.getBoundingClientRect();
+ ok(newrect.width > rect.width, "width did not increase");
+ ok(newrect.height > rect.height, "height did not increase");
+ SimpleTest.finish();
+ }));
+ </script>
+ </body>
+</html>