<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test.js"></script>
<script>
window.jsTestIsAsync = true;

function runTest() {
    var bounds = range_input_element.getBoundingClientRect();
    var range = document.caretRangeFromPoint(bounds.left + bounds.width / 2, bounds.top + bounds.height / 2);
    var shadow_tree_container = range.commonAncestorContainer;
    shadow_tree_container.prepend("foo");
    range_input_element.disabled = true;
    testPassed("Passes if we did not debug assert.");
    finishJSTest();
}
</script>
</head>
<body onload="runTest()">
    <input type="range" id="range_input_element" style="position:absolute; height: 30px; width: 100px;">
</body>
</html>