252f6320ef
Summary: For some reason, adding `border-style: solid` also adds a 3px
border around elements, which means that all of the rules that we
created are 3px too large. This sets the default size to 0 for all the
edges, which makes them correct.
Test plan:
- See that `a\rule{0em}{0em}b` produces no visible rule.
- See the new screenshots look reasonable.
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| .. | ||
| jasmine | ||
| screenshotter | ||
| katex-spec.js | ||
| symgroups.js | ||
| test.html | ||