LayoutTests/editing/selection/5333725.html

<div><span id="start" style="-webkit-user-select:none;">0123</span>45<span id="end" style="-webkit-user-select:none;">6789</span></div>

<script>
if (window.testRunner) {
    start = document.getElementById("start");
    x1 = start.offsetParent.offsetLeft + start.offsetLeft + start.offsetWidth / 2;
    y1 = start.offsetParent.offsetTop + start.offsetTop + start.offsetHeight / 2;
    eventSender.mouseMoveTo(x1, y1);
    eventSender.mouseDown();
    
    eventSender.leapForward(100);
    eventSender.mouseMoveTo(x1 + 5, y1);
    eventSender.leapForward(100);
    eventSender.mouseMoveTo(x1 + 10, y1);
    
    end = document.getElementById("end");
    x2 = end.offsetParent.offsetLeft + end.offsetLeft + end.offsetWidth / 2;
    y2 = end.offsetParent.offsetTop + end.offsetTop + end.offsetHeight / 2;
    
    eventSender.mouseMoveTo(x2, y2);
    eventSender.mouseUp();
}
</script>