Is there anything wrong with putting comments in an HTML closing tag?

I often write comments like this

<div id="wrapper"> ... </div> <!-- id="wrapper" --> 

But what if I wrote them like this?

<div id="wrapper"> ... </div id="wrapper"> 

At first it seems dangerous to put an id attribute that has the same value on another tag, but then, doesn’t the browser throw out that information? As far as I can see Chrome and Firefox both disregard any “attributes” in the closing tag.

Also seems unfortunate that it’s not a real comment. It wont be parsed semantically as a comment. But I don’t think anyone is using that space for anything else, right? Closing tags only close, right?

Is there any reason not to do this other than it’s not a standard?