chromium/third_party/blink/web_tests/fast/dom/HTMLHtmlElement/set-version.html

<html version="1">
<body>
<p>
This tests to make sure that HTMLHtmlElement::version settable.</p>
You should see 2 lines with "SUCCESS" below:
<script>
if (window.testRunner)
    testRunner.dumpAsText();

function checkExpected(actual, expected)
{
    if (actual != expected)
        document.writeln("<p>FAILURE: expected \"" + expected + "\", actual \"" + actual + "\"</p>");
    else
        document.writeln("<p>SUCCESS (value: \"" + actual + "\")</p>");
}

var htmlElement = document.getElementsByTagName("html")[0];
checkExpected(htmlElement.version, 1);
htmlElement.version = 2;
checkExpected(htmlElement.version, 2);
</script>
</body>
</html>