Everyone know that, and yet, what are the consequences exactly? Consider this:
<html lang="en">
<head>
<meta charset="utf-8">
<title>Whatever</title>
<style type="text/css" media="all">
#dupe {
color: red;
}
</style>
</head>
<body>
<div id="dupe">foo</div>
<div id="dupe">bar</div>
<script type="text/javascript">
var x = document.getElementById('dupe').innerHTML;
alert(x);
</script>
</body>
</html>
In both Chrome and IE both divs get colored red but only "foo" appears in an alert. So... there is some drama and strange, unpredictable behavior. Yeah, best to avoid this.
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