W3C reference (context only, see #200)
Foxglove
Difference
<text id="revision"> legend every test carries: it renders in a fallback font this
library cannot match, so it is excluded from the comparison entirely rather than failing every test.
The test passes if the top three lines (user units, px, em) are the same length, the fifth line (%) is the same length as the top three lines, and the bottom five lines (in, cm, mm, pt, pc) are the same length. The fourth line (ex) may have any non-zero length, since the X-height of the font will depend on the exact font chosen by the user agent (which may vary).
