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[css-align][css-multicol] Make "column-gap: normal" to be 1em in multi-column per spec #2145
Description
Specs:
- https://drafts.csswg.org/css-align/#valdef-row-gap-normal
The normal represents a UA-dependent length on multi-column elements, and computes to 0px in all other contexts.
- https://drafts.csswg.org/css-multicol-1/#valdef-column-gap-normal
Identical to , but with a UA-specified length. A value of 1em is suggested.
There's an issue in css-align about this:
ISSUE 4: Should normal just compute to 1em in multicol?
I've realized there's a WPT test checking exactly that: http://w3c-test.org/css/css-multicol/multicol-gap-001.xht
Right now is marked as optional, but it passes in all the browsers I checked: Chromium, Safari, Firefox and Edge.
Maybe it's possible to update the specs and make this test mandatory. WDYT?
Activity
rachelandrew commentedon Dec 29, 2017
Do we know what non-web browser UAs are doing here? I imagine they may be using something different.
frivoal commentedon Jan 3, 2018
At least Vivliostyle, Prince, and Pdfreactor use
1emas well. I do not have an Antenna House install to test, but i'd be surprised if it differed.frivoal commentedon Mar 29, 2018
@MurakamiShinyu Do you know what the behavior of AH formatter is for this? Is column-gap normal 1em, or some other value?
MurakamiShinyu commentedon Mar 30, 2018
AH formatter uses 1em as well.
frivoal commentedon Mar 30, 2018
In that case, I think we should just resolve that it's 1em, and remove the "UA defined" bit, as that doesn't seem to help anyone.
rachelandrew commentedon Mar 30, 2018
I agree, it seems that there is interop on this, so there seems no sense in leaving room for ambiguity.
css-meeting-bot commentedon Apr 4, 2018
The Working Group just discussed
Make "column-gap: normal" to be 1em in multi-column per spec, and agreed to the following resolutions:RESOLVED: remove the UI defined bit and go with 1em for computing normal in multi-colThe full IRC log of that discussion
<dael> Topic: Make "column-gap: normal" to be 1em in multi-column per spec<dael> AmeliaBR: In the multi-col spec there's a suggested value of 1em
<dael> AmeliaBR: Everyone is doing 1em so we suggest it's mandatory.
<AmeliaBR> s/AmeliaBR/rachelandrew /
<dael> florian: And this interop includes print. Let's go for it.
<dael> github: https://github.com//issues/2145#issuecomment-377445142
<fantasai> s/AmeliaBR/rachelandrew/
<dael> astearns: proposed is remove the UI defined bit and go with 1em for computing normal in multi-col
<dael> RESOLVED: remove the UI defined bit and go with 1em for computing normal in multi-col
[css-align-3] Multi-col 'normal' gaps are always 1em per total interop.
rachelandrew commentedon Apr 5, 2018
failed to reference the issue, but commit is here for multicol bf38268
[css-multicol] column-gap normal is 1em per spec now
[css-align-3] Multi-col 'normal' gaps are always 1em per total interop.