being upable to select teh font FAMILY is a much more common annoyance.
even a generic line like font=family:serif; is enough to "fix" fhe family and disable font selection on device a far as Kobo reader is concerned.
Line spacing controls ARE disabled by relative sizes like 1.2em; AND by non specified unit statement like line-height: 1.2;
so the line spacer controls are useless unless ALL line height CSS is manually removed.
If you look at Kinldes devices, their font / line controls just work.
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