Comment 4 for bug 617522

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Tobias Wolf (towolf) wrote : Re: fonttest tool is flawed because of default CSS

I did some quick tests (Firefox, Chromium, Opera). It’s a mess.

First of all toggling that property dynamically doesn’t work in Firefox, because it doesn’t expose it in the DOM API.
Your best bet is to statically set the style and open two tabs and switch between those.

In essence they all have different kerning. Sometimes depending on text size. There are effects where browsers enable kerning only when the text size goes above a threshold.

I think the most correct looking kerning when comparing to the desktop (useful test tool "pango-view") is Firefox/Gecko with text-rendering: optimizeLegibility on.