[Anak]

Originally Posted by doubleshuffle

I just did a very quick test and created test files with the three words from the example above: a regular epub, and a kepub. On my Aura HD, the regular epub displays the ligatures correctly, the kepub doesn't.

EDIT: Added a few words. Other ligatures, like ffi, working beautifully in the regular epub. The end letters too. No luck with the kepub.

Correct, epub does support the use of ligatures, kepub don't.
Ligatures only work, offcourse if the font contains the OpenType typographic features for ligatures.
Note: ligature support for standard Ligatures (liga) only. Other forms of ligatures don't work. E.g. contextual ligatures (clig), discretionary ligatures (dlig).

To force the render engine not to use ligatures add this code to the CSS

adobe-text-layout: optimizeSpeed;

Turn on (which is the default setting; there is no need to add this line of code)

adobe-text-layout:optimizeQuality;