User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; ja; rv:1.9.2) Gecko/20100118 Namoroka/3.6 (ayakawa PGU) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a1pre) Gecko/20100117 Minefield/3.7a1pre When default font is メイリオ(Meiryo), thumbnail title line with japanese lacks the half. Line with alphabet only not lacks the half. Reproducible: Always Steps to Reproduce: 1. Options > Content > Default font > change メイリオ(Meiryo) 2. goto http://www.youtube.com/?gl=JP&hl=ja Actual Results: Line with japanese lacks the half. Expected Results: Show line with japanese fully. NG:changeset 36457:58359ad70d1b This regression cause at 2009-12-18 or before...

(In reply to comment #0) > NG:changeset 36457:58359ad70d1b What is "NG:" ?

sorry. last sentence are: This regression caused at 2009-12-18(changeset 36457:58359ad70d1b ) or before. Previous build was not obtained from it.

sorry. I miss. This bug happen Fx 3.5.7 and Fx 3.6rc2 too.

I can confirm (doesn't happen for every single box, but is obvious to spot just on the japanese main page of youtube, Meiryo is a free download for windows XP http://www.microsoft.com/downloads/details.aspx?FamilyID=f7d758d2-46ff-4c55-92f2-69ae834ac928 ) But I can't find any obvious relationship between the changelog in http://hg.mozilla.org/mozilla-central/shortlog/36457 and this bug. Maybe bug 533379 fixed by matspal a little earlier ?? Takeshi, do you know the first earlier version that doesn't have the bug ? I tried to add Meiryo to the font.blacklist.underline_offset black list Masayuki created in bug 417014, but it doesn't seem to fix it the problem. PS : Meiryo should be the default Japanese font under Windows whenever available, I'll open a bug for that.

I don't think that this is our bug. The font size is 12px and the box's height is only 30px. The Meiryo's font metrics at 12px is here: > tmHeight 18 > tmAscent 13 > tmDescent 5 > tmInternalLeading 6 > tmExternalLeading 0 So, 30px is too short. Basically, web sites shouldn't specify height property for containers of text node.

Actually opposite to what the reporter's attachment 422279 [details] showed, it seems to happen with every version of Firefox. So there's apparently only left a Tech Evangelism bug to get youtube to not set a fixed height for those boxes.