Quote:
Originally Posted by bookman156
I realise that. You said it was determined by the metrics of the font selected. I was querying that statement. I guess now you were referring to the fonts on the device, as opposed to embedded fonts.
As for page margin, I find it odd anyone should complain that 0.5em is breaking the device. A complaint that I am preventing someone adding 0.1 em less margin is odd indeed. Have you never seen an epub open with zero margin because using the epub's CSS value? Then you force the reader to fiddle with margin settings.
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My standard when editing an ebook is to set the default margins to 0,0,0,0 which allows the reader to choose the margins. Basically set it once and forget it. Much like when you have the default font size set to 1em.
As for the metrics of the fonts? Some fonts have a larger intrinsic line height than others. You can notice this when you leave the line height alone and notice that changing the display font also changes the white space between lines. You might want to check
Deep dive CSS: font metrics, line-height and vertical-align for some visual examples using various fonts.