Forcing image alt text with CSS solution

I started thinking on ways to force the image 'alt' text when images are not visible and this is what I have come up with:

img.text,
img[alt] {
color:#202020 !important;
font-size:10px;
vertical-align:top;
}

It worked for me in Thunderbird for Mac.
Any improvements? I'm very curious to see how this works for Windows & Linux users.

I tweeted this to the CM and the awesome Ros Hodgekiss replied. :-)

Thanks!

See why 200,000 companies worldwide love Campaign Monitor.

From Australia to Zimbabwe, and everywhere in between, companies count on Campaign Monitor for email campaigns that boost the bottom line.

Get started for free