Build Identifier: http://hg.mozilla.org/mozilla-central/rev/b4143e04bea1 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 ID:20131104044747 Steps To Reproduce: 1. Open https://developer.mozilla.org/en/demos/detail/animated-svg/launch 2. Observe font rendering of header at the top of page Actual Results: Font rendering distortion, Font weight become thin sometimes. Disabled HWA does not help.

Regression window(m-c) Good: http://hg.mozilla.org/mozilla-central/rev/3f0587ce1774 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120917014902 Bad: http://hg.mozilla.org/mozilla-central/rev/0d3b17a88d5f Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120917122101 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=3f0587ce1774&tochange=0d3b17a88d5f Regression window(m-i) Good: http://hg.mozilla.org/integration/mozilla-inbound/rev/08f87045d076 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120916210500 Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/5b2fe6b88ca4 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/18.0 Firefox/18.0 ID:20120916224402 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=08f87045d076&tochange=5b2fe6b88ca4 Suspected: Bug 777194

(In reply to Alice0775 White from comment #1) > Pushlog: > http://hg.mozilla.org/integration/mozilla-inbound/ > pushloghtml?fromchange=08f87045d076&tochange=5b2fe6b88ca4 > > Suspected: Bug 777194 The patch from bug 777194 in that range I would only expect to affect images. Perhaps a different changeset caused this?

(In reply to Timothy Nikkel (:tn) from comment #2) > (In reply to Alice0775 White from comment #1) > > Pushlog: > > http://hg.mozilla.org/integration/mozilla-inbound/ > > pushloghtml?fromchange=08f87045d076&tochange=5b2fe6b88ca4 > > > > Suspected: Bug 777194 > > The patch from bug 777194 in that range I would only expect to affect > images. Perhaps a different changeset caused this? OK, right. In local build, Last Good: 3ee856aa68d2 First Bad: 5c68c842a1fc Regressed by: 5c68c842a1fc Robert O'Callahan — Bug 788877. Don't create nsDisplayFixedPosition items when the root scroll frame is inactive. r=Cwiiis Bug 788877 landed Firefox16 and 17 as well as 18. However, this problem does not happen in Firefox16 and 17.

WFM, Nightly Linux64 and OSX.

Alice, is this still an issue for you?

Reproduced on Firefox 27, Not reproduced Firefox38esr and 41 and later