chromium/third_party/blink/web_tests/editing/pasteboard/paste-into-table-cell.html

<!DOCTYPE html>
<html>
<head>
<style>

table, td {
    border: solid 1px #8bb8f4;
    border-collapse: collapse;
}

</style>
</head>
<body onpaste="setTimeout(dump, 0)" contenteditable="true">
<p>This tests pasting into a table cell.
To manually run the test, copy the text below and paste it into the first text cell after the non-breaking space.
The content should be pasted into the first cell, not between two tds.</p>
<div id="source">Drag me</div>
<div id="result"><table width="400"><tbody><tr><td>&nbsp;</td><td>&nbsp;</td></tr><tr><td>&nbsp;</td><td>&nbsp;</td></tr></tbody></table></div>
<script src="../../resources/dump-as-markup.js"></script>
<script>

var source = document.getElementById('source');
getSelection().selectAllChildren(source);

document.execCommand('copy', false, null);

Markup.description(document.querySelector('p').textContent);
Markup.waitUntilDone();

function dump() {
    Markup.dump('result', '"Drag me" should appear inside the first td');
    Markup.notifyDone();
}

if (document.queryCommandEnabled('paste')) {
    getSelection().collapse(document.querySelector('td').firstChild, 1);
    document.execCommand('paste', false, null);
}

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