From mboxrd@z Thu Jan  1 00:00:00 1970
From: Uriel Avalos <amscopub-mail@yahoo.com>
Subject: Bug: LaTeX fragments export to invalid XHTML
Date: Tue, 23 Nov 2010 09:45:28 -0500
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To: emacs-orgmode@gnu.org

This is the sample file:

  * Hello world
  \begin{align*}
  x&=\frac{-b^2\pm\sqrt{b^2-4ac}}{2a}
  \end{align*}

When you validate the resulting HTML file at the w3c site
(http://validator.w3.org/check), it fails the check.

If you recall, when org-export-with-latex-fragments is set to dvipng,
it produces PNG images with the ALT attribute equal to the
corresponding LaTeX equation. In this case, the resulting IMG tag
is:

<img src="<filenameofPNG>"
alt="\begin{align*}x&=\frac{-b^2\pm\sqrt{b^2-4ac}}{2a}\end{align*}"/>

Apparently, you can't have unescaped & (ampersands) in an ALT tag.
Thus, the resulting HTML file fails to validate.