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If you open the <sub> tag and forget to close it in a question's text, it will render text as subscript in the preview zone, but not on the actual question's page.

For instance, this text renders as subscript from the preview zone.

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4  
Incorrect HTML is incorrect... – Shog9 Oct 19 '10 at 2:04
    
@Shog9 Of course it isn't. – zneak Oct 19 '10 at 2:31
up vote 2 down vote accepted

We have changed the preview to work more like the server-side version when handling invalid markup, so after the next build, the preview of your post will look like the final version.

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