Automatic update from web-platform-tests
Lint rule for using Ahem as a web font. (#18877)
Add a lint rule to check for tests that use the Ahem font but do not
include the /fonts/ahem.css stylesheet (which loads this font as a web
font). This prevents tests from assuming that Ahem is installed as a
system font. Also includes some unit tests.
There are a few tests that are incorrectly flagged as violating this
rule, these were added to lint.whitelist.
A bunch of other tests were fixed to load Ahem as a web font.
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wpt-commits: c66230eebbea3bce8c086572869eb0835fb183b5
wpt-pr: 18877
