@Rev. Bob
In a browser I have the option to press STRG+0 to reset the font-size to the winning style rules.
Such an option does not exist in the Kobo.
Ok, we have to accept that, we cannot hack it.
But it's necessary to mention it, when we're looking for analogies.
And:
I have no idea why I get a font with a height of 4,5mm.
I can't explain that result.
A logical result would be 3,1 mm. That is the mathematically correct value for 28px, which is set in the Kobo ereader.conf.
But there is a strange interaction of the reading options of the Kobo and CSS, which I do not understand yet.
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