[css-forms-1] does select use correct writing-mode for positioning?

[fantasai]

position-try-fallbacks:
    /* First try above and span-right. */
    block-start span-inline-end,
    /* Then below but span-left. */
    block-end span-inline-start,
    /* Then above and span-left. */
    block-start span-inline-start;

These values all use the writing mode of the containing block, but that's often going to be the page itself. If you have an RTL control (whether just the RTL control or the component it's in is RTL), you probably want to align it based on its own writing mode.

So these should probably all have self- prepended, I think.

[fantasai]

(Tagging against anchor-positioning temporarily for agenda purposes, since it's related to the discussion in #13734 even though it's not an issue against that spec.)

[css-meeting-bot]

The CSS Working Group just discussed [css-forms-1] does select use correct writing-mode for positioning?, and agreed to the following:

• RESOLVED: Change select picker positioning (position-area + try fallbacks) to use self-block-start / self-inline-start rather than block-start / inline-start

The full IRC log of that discussion

<emilio> fantasai: there's a demo from adam argyle with a bunch of select menus on different languages
<emilio> ... one of the things we noticed was that the positioning of the dropdown should be align with the select itself rather than the WM of the containing block
<emilio> ... which could be the viewport
<emilio> ... if you have mixed languages you probably want to position the select to the select itself
<TabAtkins> Definitely, yes
<emilio> ... so rather than using block-start / inline-start, should use `self-block-start` / `self-inline-start`?
<emilio> ... that's my proposal
<emilio> +1
<TabAtkins> q+
<emilio> ack fantasai
<Zakim> fantasai, you wanted to mention control-value()
<emilio> ack TabAtkins
<emilio> TabAtkins: they more explicit they should be using the select's writing-mode, but that's not expressible atm
<emilio> ... so that's correct
<emilio> emilio: agreed
<emilio> PROPOSED: Change select picker positioning (position-area + try fallbacks) to use self-block-start / self-inline-start rather than block-start / inline-start
<emilio> RESOLVED: Change select picker positioning (position-area + try fallbacks) to use self-block-start / self-inline-start rather than block-start / inline-start