Re: Adapting Text Units: Spaces, paragraphs, and ems

Hi Laura,

We should probably stick closely to the CSS3 definition, thankfully it is not HTML specific:
“Equal to the computed value of the font-size property of the element on which it is used.”
https://www.w3.org/TR/css3-values/#em 

What is missing is how it applies to letter/word spacing.

How about:
“em: Equal to the computed value of the font-size property of the element on which it is used. When applied to letter and word spacing it is additional to the default space between letters and words.”

Do we have a normal way of saying: This is the definition from elsewhere (e.g. CSS3) whilst quoting it?

Cheers,

-Alastair