See layout test results at https://build.webkit.org/results/Apple%20iOS%2010%20Simulator%20Release%20WK2%20(Tests)/r217921%20(2069)/media/modern-media-controls/button/button-icon-name-pretty-diff.html.
Created attachment 312302 [details] Patch
Committed r217939: <http://trac.webkit.org/changeset/217939>