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<body>
<p>This tests copying content across shadow boundaries doesn't crash.<br>
To test manually, copy text below starting from "Hello" ending in the space before "World". Test passes if it doesn't crash.</p>
<p>PASS if didn't crash.</p>
<div id="start"><span id="hello">Hello</span></div>
<script>
const shadowRoot = start.attachShadow({mode: 'open'});
shadowRoot.innerHTML = '<slot></slot> World';

if (window.testRunner) {
    testRunner.dumpAsText();

    var x = start.offsetLeft;
    var y = start.offsetTop + start.offsetHeight / 2;

    eventSender.mouseMoveTo(x, y);
    eventSender.mouseDown();

    eventSender.mouseMoveTo(x + hello.offsetWidth, y);
    eventSender.mouseUp();

    document.execCommand('copy');
}
</script>
</body>
</html>