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

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.

We can either break this situation by making *both* refer to the 
parent element's metrics, or by just making one of them refer to the 
parent element and letting the other one rely as usual. 

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. 
However, I could easily be convinced otherwise by a decent argument.  
We probably want to poll implementors on what seems best to them.

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Received on Tuesday, 22 November 2016 18:37:39 UTC