mousedown-in-subframe-scrollbar.html

<body onload="test()">
    <p>This tests that clicking on a scrollbar in a frame does not clear selections in the frame.</p>
    <iframe id="fr" src="resources/mousedown-in-subframe-scrollbar.html"></iframe>
    <div id="results"></div>
</body>
<script>
function test() {
    if (window.testRunner)
        testRunner.dumpAsText();

    var iframe = document.getElementById("fr");
    iframe.contentWindow.focusAndSelectText();

    if (window.eventSender) {
        var x = iframe.offsetLeft + iframe.offsetWidth;
        var y = iframe.offsetTop;
        eventSender.mouseMoveTo(x - 5, y + 5);
        eventSender.mouseDown();
        eventSender.mouseMoveTo(x - 5, y + 20);
        eventSender.mouseUp();
    }
    document.getElementById("results").innerText = "Selection: " +
        iframe.contentWindow.getSelection();
}
</script>

chromium/third_party/blink/web_tests/fast/events/mousedown-in-subframe-scrollbar.html