third_party/WebKit/LayoutTests/editing/pasteboard/5006779.html

<style>
blockquote {
    border-left: 2px solid blue;
    margin: 0;
    padding-left: 10px;
    color: blue;
}
</style>
<p>This tests copying/pasting less than a paragraph of quoted content.  It should not appear quoted.</p>
<div id="div" contenteditable="true">
<br>
<br>
<blockquote type="cite">On Tuesday, Dave wrote:</blockquote>
<blockquote type="cite"><br></blockquote>
<blockquote type="cite">Hello World.</blockquote>
</div>

<script>
if (window.internals)
    internals.settings.setEditingBehavior('mac');

var sel = window.getSelection();
var div = document.getElementById("div");
sel.collapse(div, 0);
sel.modify("move", "forward", "paragraph");
sel.modify("move", "forward", "paragraph");
sel.modify("extend", "forward", "word");
document.execCommand("Copy");
sel.collapse(div, 0);
document.execCommand("PasteAndMatchStyle");
</script>