Dangerous Tag Attributes

After the appearance of the ill-fated Black Lord, he decided to conduct his own research of bottlenecks in Habré. Found a couple of moments, not critical, Prada, but all the same these are moments that IMHO should not be.
So in a post or, which is much more critical - in the comments, I can write something like
<div class="someclass"> </div>
<div id="someid"> </div>

And what will we get? And the fact that if among the CSS-habraclasses and ID to find the right one, then you can make fun of the page and habrayuzerami. After several attempts, it was possible to partially block the buttons with the text of the ± comment.

PS: It's good that in the habre among the CSS classes there are no blocks with position: fixed , it would be “interesting”. And it's very good that the style attribute is automatically replaced with wtf.