Section (12) of the test page show a floating element where the width has ben set to be very small. In such cases, the UA is allowed to increase the value. From section 4.1.2 of CSS1: "The 'width' has a non-negative UA-defined minimum value (which may vary from element to element and even depend on other properties). If 'width' goes below this limit, either because it was set explicitly, or because it was 'auto' and the rules below would make it too small, the value will be replaced with the minimum value instead." Current thinking goes towards interpreting the above quite liberally, i.e. let the UA use whatever value it finds the best.

We talked about this, and I think you may already be doing it

Fixed. We now apply a minimum width to objects that have a specific width setting that is "too small".

Kipp, what is the minimum width for objects that have a specific width setting that is "too small"? I could not find that addressed in the ua.css file for the 3/26 build. I'm not sure where else to look.

The minimum width is undefined, and outside the spec. The value used is the "natural" minimum width when the object is reflowed with a zero available width, which means that each line will be as short as possible. As that varies from content to content, there is no easy answer.