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Re: [csswg-drafts] [css-values] Add the ''lh'' and ''rlh'' units

From: Florian Rivoal via GitHub <sysbot+gh@w3.org>
Date: Wed, 23 Nov 2016 03:37:47 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-262428522-1479872266-sysbot+gh@w3.org>
> While this copies the circularity-breaker of font-size/em in 
handling line-height using lh, it doesn't address the new cycle we're 
adding when font-size uses lh and line-height uses em.

I'm not seeing it.

What happens to the font-size when it is defined in `lh` is addressed:
 I did not add a new paragraph for that, but the existing one about 
the exception to `font-size` is for all font-relative length units, 
and `lh` is classified as one.

And as long as you have that, it doesn't matter that the `line-height`
 depends on the font-size (which it does even if you don't use `em`s, 
and use percentages or unitless numbers), since there's no loop.

Did you miss that, or am I missing something else? Can you give an 
example of this loop you're seeing and that I am not?

> I think I prefer treating the em unit as slightly more fundamental, 
so that line-height/em will use the parent element's metrics, and then
 font-size/lh will just rely on the element's metrics as usual. 

How would that work when line-height, instead of being in `em`, is a 
naked number or a % or its initial value of normal? In that case, it 
still depends on `font-size,` so that would be causing a loop, 
wouldn't it?

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Received on Wednesday, 23 November 2016 03:37:53 UTC

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