[Invalid] Markup Validation of https://mersenneforum.org/showpost.php?p=578047&postcount=215

Error found while checking this document as XHTML 1.0 Transitional!

Result:

1 Error

Address:

Encoding:

utf-8

Doctype:

XHTML 1.0 Transitional

Root Element:

html

Root Namespace:

Options

Help on the options is available.

Line 391, Column 9: end tag for "center" omitted, but OMITTAG NO was specified
```
			</div>
```
✉

You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
Line 386, Column 30: start tag was here
```
			<div id="postmenu_578047"><center>
```