<style>
div { vertical-align: 0vh; -webkit-user-modify: read-write }
</style>
<body>

<div>
<object id="target" style="contain: size" data="?"></object>
</div>

<script>
if (window.testRunner)
    testRunner.dumpAsText();
(function() {
	document.getSelection().collapse(document.getElementById("target"));
	document.execCommand("underline");
})();
</script>

<div>This test passes if it doesn't crash</div>

</body>