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Originally Posted by JSWolf
If the program being used respects the correct default values for h?, then <h4> will give 1em.
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Why are they "correct" default values? I don't recall their being given in any specification. At most they are recommendations or common values.
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IMHO, 100% is not as understandable as you have to know what the the what the 100% is 100% of. If you use 1em as the font size, you know it's 1em. So 120% would be 20% larger then 100%, but you still don't know what 100% translates to so how would you know what 120% is other then 20% larger then 100%?
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100% is the selected font size that I (the user) choose as my preferred/default. The same could be said for 1em: 1em at which font size? If you don't know what 100% is, you also don't know what 1em is. To me it is clear that 100% is the size the font would be if there were no other scaling (explicit or default) applied.