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I see dark grey line between the triangles on Firefox 15 beta3 Windows XP Home 32bit

Maybe this is hardware dependent? I do not have any hardware acceleration that I am aware of - integrated i3 graphics.

Looks to be hardware dependant. On 32bit Firefox 14.0.1 under win7 64bit, I only see the thin line if I disable hardware acceleration in my settings.

I've seen it in Linux too. I didn't know what caused it and had to design around it.

It's very cool to have a reason, and even better a solution.

But I'm worried about cross browser compatibility.