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chromium/third_party/blink/web_tests/editing/pasteboard/paste-text-012.html 

<!DOCTYPE html>
<html> 
<head>
<script src="../../resources/dump-as-markup.js"></script>
<style>
.editing { 
    border: 2px solid red; 
    padding: 12px; 
    font-size: 24px; 
}
</style>
</head> 
<body>
<p>See this bug: <a href="rdar://problem/3918712">&lt;rdar://problem/3918712&gt;</a> "Paste as Quotation" in Mail just pastes (&lt;blockquote&gt; tag seems to be lost).</p>
<p>To manually test, copy everything in the first editable box and paste it in the second box.
You should see "foo" and a new line inside a red box.</p>
<div contenteditable id="root">
<div id="test" class="editing"><div><blockquote>foo</blockquote></div></div>
<div class="editing"></div>
</div>
<script src=../editing.js language="JavaScript" type="text/JavaScript" ></script>
<script>

function editingTest() {
    for (i = 0; i < 4; i++)
        extendSelectionForwardByCharacterCommand();
    copyCommand();
    for (i = 0; i < 2; i++)
        moveSelectionForwardByCharacterCommand();
    pasteCommand();
}

if (window.testRunner)
    runDumpAsTextEditingTest();
</script>
</body>
</html>