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The line height has an app or ereader default.
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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.