We should be able to handle non-theme items without any trouble. These show up on facebook.

There are three reasons that prevent facebook enter page from converting button display items to webrender : 1. We fallback and create original display items when there is no BorderRenderer[1]; but no BorderRenderer actually means we don't need to draw borders(might because border width/height is 0) so we shouldn't fallback here. 2. nsDisplayBoxShadowInner don't create webrender display items when there is border radius; however, we can deal with border radius with the same radii so I loose the fallback condition. 3. Currently we don't use webrender for styled borders, we should unlock them. These patches might cause some reftest fails[2], these patches can not fix all of them currently. [1] https://dxr.mozilla.org/mozilla-central/rev/db7f19e26e571ae1dd309f5d2f387b06ba670c30/layout/forms/nsButtonFrameRenderer.cpp#339 [2] https://treeherder.mozilla.org/#/jobs?repo=try&revision=5409b0721876d39e4bbb441f7ae495724016f02b

Per discuss with Ethan; we decided to separate the issues in comment three into different bugs since some of them need further discussion.

Any update on this work?

The only non-theme item we haven't handled in facebook page is styled borders. I will enable it in Bug 1396491.

This problem is fixed after bug 1409243 is landed.