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In HTML, missing opening quotation mark causes everything else to get ignored by validator
<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<div id=red"
</div>
<div id=blue>
</div>
<div id=yellow>
</div>
<div id=black>
</div>
Not only does this not throw a validation error, but nothing after the id=red" line is validated at all.