Re: mtable positioning in MathML Core

Someone who knows CSS better than I might be able to suggest something, but
I'm dubious. CSS can't even do decimal alignment 8-|.

I think MathML has some very useful alignment features (beside just
"decimal"), but adding them is I think level 2
<https://github.com/w3c/mathml-core/issues/44> or (not labeled level 2) this
issue <https://github.com/w3c/mathml-core/issues/125>. I suspect you'll
need to rely on a polyfill, but some people have very clever CSS tricks up
their sleeves.

    Neil


On Thu, Dec 1, 2022 at 4:23 PM Miller, Bruce R. (Fed) <bruce.miller@nist.gov>
wrote:

> Hi Neil;
> "which specific CSS feature I'm trying to use" is exactly my question:
> Which feature *should* I use to get the effect of (full) mtable's
> align="baseline 1"?
>
>   Are you suggesting that
>      align-content: first baseline;
> is what I'm looking for? It doesn't seem to help in Chrome.
> All the other tricks I find seem to want me to change the display property
> of the mtable (from table), which doesn't seem helpful.
>
> As for a general polyfill, all I can say so far is that @columnalign
> wasn't too hard :>
>
> Thanks;
> bruce
>
> On 12/1/22 2:48 PM, Neil Soiffer wrote:
> > According to
> >
> https://developer.mozilla.org/en-US/docs/Web/CSS/align-content#browser_compatibility
> > <
> https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FCSS%2Falign-content%23browser_compatibility&data=05%7C01%7Cbruce.miller%40nist.gov%7Cae796cc49093442fb20108dad3d523f4%7C2ab5d82fd8fa4797a93e054655c61dec%7C1%7C0%7C638055209634388729%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=MbrZx%2B%2BoHNuixcbOuDrLM2aHbkyTpMBA7udpIF%2FxF50%3D&reserved=0>,
> most CSS alignment is implemented. You didn't mention which specific
> feature in CSS you are trying to use. I'm dubious that it is "easily" done
> because usually CSS deals with parent-child relationships. In this case, it
> is a parent-grandchild relationship.
> >
> > The mtable polyfill only handles mlabelledtr and needs to be expanded
> (I'll add an issue
> > if there isn't one already). At the time I wrote the polyfill, it wasn't
> clear whether any
> > of the MathML mtable attrs would end up in core or not. The polyfill
> will need to handle
> > it by doing some measurements and then (likely) use CSS (absolute
> position) or mpadded to
> > do the appropriate shift.
> >
> >      Neil
> >
> >
> > On Thu, Dec 1, 2022 at 8:17 AM Miller, Bruce R. (Fed) <
> bruce.miller@nist.gov
> > <mailto:bruce.miller@nist.gov>> wrote:
> >
> >     Hi all;
> >         I'm wondering what the proper modern CSS method
> >     is to achieve the equivalent of MathML Full's
> >         <mtable align="baseline 1" ...
> >     given that that attribute is not included in Core.
> >
> >     That is, to align the table (as a whole) so that
> >     the baseline (or math axis, or ...) of the 1st row
> >     lines up with the baseline of its siblings.
> >
> >     CSS Box Alignment level 3 looks like it should answer that,
> >     but I can't quite apply it (or it isn't implemented in Chrome?)
> >
> >     Thanks;
> >     bruce
> >     --
> >     bruce.miller@nist.gov <mailto:bruce.miller@nist.gov>
> >     http://math.nist.gov/~BMiller/ <http://math.nist.gov/~BMiller/>
> >
>
> --
> bruce.miller@nist.gov
> http://math.nist.gov/~BMiller/
>
>