Cross-browser kerning-pairs & ligatures

Improved handling of kerning pairs and ligatures in modern browsers using the text-rendering: optimizeLegibility; declaration.

The declaration is currently supported by:
Safari 5, The Webkit Nightlies & Chrome.

Firefox already uses optimizeLegibility by default for text sizes above 20px.

Paul Irish was so kind as to pass on a few bugs that have surfaced.

In recent versions of Chromium, mixing optimizeLegibility and font-variant: small-caps will cause the small-caps to not render.
Irritatingly, it also causes text to disappear completely on webOS.
Joseph Pearson also points out that on slower machines (such as mobile devices) it can negatively impact page load when applied to large blocks of text.

AVAST