<!DOCTYPE html>
<html>
<head>
<style>
table { -webkit-column-count: 3; transform-origin: 81; column-span: all; }
.multicol { -webkit-column-count: 7; }
</style>
<script>
if (window.testRunner) {
    testRunner.waitUntilDone();
    testRunner.dumpAsText();
}
function runTest() {
    getSelection().deleteFromDocument();
    setTimeout(() => {
        let count = location.search ? +location.search.substring(1) : 1;
        if (count >= 20) {
            document.open();
            document.write('This test passes if WebKit does not crash.<br>PASS.');
            document.close();
            if (window.testRunner)
                testRunner.notifyDone();
        } else
            location.href = '?' + (count + 1);
    }, 10);
}

function selectAll() {
    document.execCommand("selectAll", false);
}

</script>
</head>
<body onload=runTest()>
<div class="multicol" tabindex="1" autofocus>
    <table>
        <th>
            <table>a</table>
        </th>
        <tr>b</tr>
    </table>
</div>
<li class="multicol">
    <iframe allowfullscreen="true" srcdoc=")#&quot;~KVv8CRs" loopstart="1">c</iframe>
</li>
<details open="true" ontoggle="selectAll()">d</details>
</body>