<html>
    <head>
        <script>
            function setup() {
                if (window.testRunner) {
                    window.testRunner.dumpAsText();
                    window.testRunner.waitUntilDone();
                }

                s = document.getElementById("select");

                s.addEventListener("focus", function() {
                    s.size = 1;

                    window.setTimeout(function() {
                        if (window.testRunner)
                            window.testRunner.notifyDone();
                    }, 0);
                });

                ev = document.createEvent("MouseEvent");
                ev.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 20, 20, false, false, false, false, 0, null);
                s.dispatchEvent(ev);
            }
        </script>
    </head>
    <body onload="setup()">
        <p>
            WebKit bug #<a href="https://bugs.webkit.org/show_bug.cgi?id=131566">131566</a>: Assertion failure changing select element size during focus event dispatch. This test passes if it does not assert in a debug build.
        </p>
        <select id="select" size="2">
            <option>option 1</option>
            <option>option 2</option>
        </select>
    </body>
</html>