Created attachment 270729 [details] [Animated GIF] Before/after San Francisco font gives us more fine grained control over font-weight than Helvetica: https://cloudup.com/cJ5mg-SQRO0 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.
<rdar://problem/24520326>
Created attachment 270730 [details] Patch
Comment on attachment 270730 [details] Patch Clearing flags on attachment: 270730 Committed r196168: <http://trac.webkit.org/changeset/196168>
All reviewed patches have been landed. Closing bug.