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Looking at the source of the Hello World! box, you see this:

<p><p>This is a collaboratively edited question and answer site for <b>professional and enthusiast programmers</b>. It's 100% free, no registration required.</p></p>

There are two opening <p> tags and two closing </p> tags, which the browser interprets as this:

<p></p>
<p>This is a collaboratively edited question and answer site for <b>professional and enthusiast programmers</b>. It's 100% free, no registration required.</p>
<p></p>

and produces this validation error:

Error Line 2786, Column 177: No p element in scope but a p end tag seen.

…d enthusiast programmers</b>. It's 100% free, no registration required.</p></p>

This error is the only one preventing the front page of Stack Overflow from being "valid" HTML5.

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8  
fixitfixitfixit –  Ben Brocka May 11 '12 at 21:18
    
I imagine the scope that the validation error refers to is the parser/tokenizer resolving the first closing </p> tag thus no longer being in the scope of a paragraph, then encountering the second closing </p> tag which it's not expecting anymore since the last paragraph was just closed. –  BoltClock's a Unicorn May 11 '12 at 21:19
    
@BoltClock'saUnicorn: The error was referring to the scoped attribute that was supposed to be on the <style> element (which I have personally never heard of before). The link to its corresponding documentation was dead, though. –  animuson May 11 '12 at 21:36
    
@animuson: Ah, scoped stylesheets in HTML5/CSS. I've heard passing mentions of them in the www-style lists, but don't know much about them myself. –  BoltClock's a Unicorn May 11 '12 at 21:42

1 Answer 1

up vote 3 down vote accepted

This is now fixed and will be rolling out with the next build.

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