Should the min-content style on fieldset really be min-width, or min-inline-size?

[bzbarsky]

https://html.spec.whatwg.org/multipage/rendering.html#the-fieldset-and-legend-elements says:

min-width: min-content;

but should it really be min-inline-size: min-content instead? The relevant testcase is:

<fieldset style="writing-mode: tb; width: 0; height: 0">This is a test</fieldset>

which is very nicely not interoperable amongst UAs to start with, though none seem to actually do the min-inline-size bit.... So maybe we should just leave the min-width with a comment about how it's legacy that any sane web page should turn off or something.

[zcorpan]

This is basically part of #1221

So far I have only changed the spec to require usage of logical properties where the majority of browser engines already did. A bunch of cases are left where only Gecko does, or where nobody uses logical properties (like this issue apparently, and <hr align>). I would be happy to change the spec to require more logical properties though if there is impl interest.

[zcorpan]

Since the rest of fieldset is defined to honor writing-modes, I think we should just fix this to do the right thing.