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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="foo1" class="foo"></div>
<code>
<div id="foo2" class="foo"></div>
<div id="foo3" class="foo"></div>
</code>
<pre id="out"></pre>
<script>
var elements = document.querySelectorAll("code .foo");
try {
if (elements.length !== 2)
throw 1;
if (elements[0].id !== "foo2")
throw 3;
if (elements[1].id !== "foo3")
throw 4;
document.getElementById('out').innerHTML = "Success!";
} catch (e) {
document.getElementById('out').innerHTML = "Error number " + e;
}
</script>
</body>
</html>
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