alt="" in dependency charts makes them poorly accessible

The dependency chart for a specification uses, for each specification, code like this:
<area shape="rect" href="https://features.launchpad.net/products/launchpad/+spec/1.0&#45;front&#45;page" title="1.0 front page" alt="" coords="205,54,245,71" />

This is a good use of the title= attribute. Unfortunately, the alt="" means the chart is difficult to understand in some text-only browsers. lynx does a decent job, but elinks presents a list of raw URLs.

The chart uses the abbreviated names only to save space, which isn't an issue with text-only rendering. So in this case, the alt= attribute should be set to the full title of the spec, just like the title= attribute is.