Fonts too thin in certain conditions

[Michał Gołębiowski-Owczarek]

Created attachment 176985 [details]
Chrome Canary screenshot (in Firefox stable it looks the same)

1) Open http://wystawy.bn.org.pl/ptolemeusz/corridor/
2) Mouse over one of boxes and look at how text looks.

Effect:
In Chrome Canary & Firefox stable text looks as in Chrome.png screenshot; on Safari it's way thinner, as in Safari.png screenshot. Worth noting is that in Chrome stable the bug exists, too, so they had to fix it recently. Nonetheless, in Webkit nightly the bug still exists.

[Michał Gołębiowski-Owczarek]

Created attachment 176986 [details]
Webkit Nightly screenshot (in Chrome stable it looks the same)

[Michał Gołębiowski-Owczarek]

Chrome stable and Webkit Nightly experience this bug differently, though. In Chrome it's enough to remove the last div, containing two canvases stretching to the entire window and the fonts start to look as intended; in Webkit it's not enough (that's why I didn't prepare a minimal example, I honestly have no idea what's causing the issue :/).

[Alexey Proskuryakov]

Is this bug 23364?

[Michał Gołębiowski-Owczarek]

It might be, though shouldn't it then start behaving correctly once canvases are removed from the DOM? As it was in Chrome?

[Michał Gołębiowski-Owczarek]

BTW, maybe it's worth a shot to ask Chrome people how they dealt with this; I assume they had to patch their Webkit version somehow.