test_bug1301290.html

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<!DOCTYPE html>

<html>

    <head>

        <title>Test for Bug 1301290</title>

        <script src="/tests/SimpleTest/SimpleTest.js"></script>

        <script 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 - 9,  rect.height - 9,  { 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>