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.
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