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Test Info:

<!--quirks mode test-->
<html class="reftest-wait">
<body>
<img id="img1" src="about:blank">
<img id="img2" src="about:blank" alt="alt2">
<script>
function doTest() {
document.getElementById("img1").setAttribute("alt", "alt1");
document.getElementById("img2").removeAttribute("alt");
document.documentElement.removeAttribute("class");
}
window.addEventListener("load", doTest);
</script>
</body>
</html>