<!DOCTYPE html>
<html>
<body>
<textarea id="test" cols=50 rows=10>first
second</textarea>
<script src="../../../resources/js-test-pre.js"></script>
<script src="../../editing.js"></script>
<script src="../../../resources/ui-helper.js"></script>
<p id="console"></p>
<script>

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

var textarea = document.querySelector('textarea');

function selectFirstLineIncludingLineBreak() {
    var element = document.getElementById("test");
    const boundingRect = element.getBoundingClientRect();
    const x = boundingRect.x + 5;
    const y = boundingRect.y + 5;
    UIHelper.doubleClickAtThenDragTo(x, y, x + boundingRect.width/2, y);
}

function copyPaste() {
    document.execCommand('copy');
    document.execCommand('paste');
}

var offsetAfterLineBreak = 6;
shouldBe("selectFirstLineIncludingLineBreak(); copyPaste(); textarea.selectionEnd", "offsetAfterLineBreak");

</script>
</body>
</html>