another funny html thingy: blockquote
Good html:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html><head><title></title></head><body>
<div>
<blockquote>
<div>
X
</div>
</blockquote>
</div>
</body></html>
Bad html:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html><head><title></title></head><body>
<div>
<blockquote>
X
</blockquote>
</div>
</body></html>
Check it yourself.