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Old 05-02-2018, 10:20 AM   #51
jackie_w
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Posts: 6,212
Karma: 16534894
Join Date: Sep 2009
Location: UK
Device: Kobo: KA1, ClaraHD, Forma, Libra2, Clara2E. PocketBook: TouchHD3
Quote:
Originally Posted by Doitsu View Post
I just tried it with ADE 4.5 and the Chrome Readium app and it didn't make a difference. BTW, some typographers claim that using optimizeLegibility causes performance issues.
I haven't tested t his myself, though.
Too bad it didn't work. Another possibility, in Kobo kepubs this also worked:
Code:
-webkit-font-feature-settings: "liga", "dlig";
In case you're interested, there was a short discussion about the pros/cons of optimizeLegibility in this old kepub vs epub thread (post #19 onward). I've been using it quite happily ever since then, but did need to devise a bit of automatic kepub mark-up tweaking to reduce the word-/letter-spacing problems discussed.

I haven't noticed a performance problem on my Kobos. However, I never actually include this specialised CSS directly in my calibre master copy of the epub as I like to keep these as "vanilla" as possible because I use the same epub on my Android devices. I don't use the Kobo Android app.

Whenever possible I patch the on-device Kobo default kepub override CSS sheet. If that can't be done I auto-add any Kobo-specific CSS on-the-fly during calibre send-to-device.
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