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.
Several different images are displayed one above the other; if gamma correction is correctly performed based on the values in the gAMA chunk in the PNG file, the resulting displayed values are the same in all of the files (except for rounding error, which gives some artefacts at the right side of the lowest two images due to the very high levels of gamma correction needed for this test)
