chromium/third_party/blink/web_tests/editing/input/div-first-child-rule-input.html

<!DOCTYPE html>
<head>
<style type="text/css">
div:last-child {}
</style>
<script>

if (window.testRunner)
    testRunner.dumpAsText();

// The bug only reproduces when input is the last element in body
// So we have no choice but to run the test on page load.
function runTest() {
    var input = document.body.getElementsByTagName('input')[0];
    input.focus();
    input.selectionStart = 5;
    input.selectionEnd = 5;
    document.execCommand('InsertHTML', false, '<div> world</div>');
    var result = input.value == 'hello world' ? 'PASS' : 'FAIL';
    input.parentNode.insertBefore(document.createTextNode(result), input);
    if (window.testRunner)
        input.parentNode.removeChild(input);
}

</script>
</head>
<body onload="runTest()">
<p>This test ensures WebKit can paste content inside an input element even when there is div:last-child {}.</p>
<input type="text" value="hello">
</body>
</html>