Created attachment 270729 [details]
[Animated GIF] Before/after
San Francisco font gives us more fine grained control over font-weight than Helvetica:
Currently, we use font-weight: normal (400) and bold (700).
Now we can take advantage of in-between values: 500 and 600.
Decreasing font-weight of inner sections can provide an extra clue about the nesting.
See the attached GIF.
Created attachment 270730 [details]
Comment on attachment 270730 [details]
Clearing flags on attachment: 270730
Committed r196168: <http://trac.webkit.org/changeset/196168>
All reviewed patches have been landed. Closing bug.