thanks - I could try that but won't 0.3 em map to 0em in mobi output due to rounding ?
could you see what happens with your code AND use an epub with with a specific text-indent 0 in its main calibre style within the style sheet, to see if you get the same override issues as I did please.
I have yet yo test with epub outputs as I did not want to overwrite my sources, I could make backups & then do so though, if you think my fails-to-indent bug is mobi-specific.
i don't have an intuitive sense of own an x% indent cxompares to a number of ems in dent. why, may i ask, do you prefer to use % settings , and are they mobi-compatible.