On Tue, 05 Feb 2013 07:17:46 -0800
Marc Perkel <supp...@junkemailfilter.com> wrote:

> Is there some sort of rule to catch white text on white background to 
> hide text? Seems like there should be.

> <FONT COLOR="#FFFFFF">

Going down that path leads to madness.  Then you have to worry about:

<font color="#FFFFFE"> and variants
<span class="white"> ... </span>   where "white" is defined in CSS
<font style="color: #fff">

etc.  To do it properly, you have to re-implement an entire HTML
rendering engine.  Maybe now <font color="#ffffff"> is low-hanging fruit,
but that probably won't last.

Regards,

David.

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