New property to control the direction of slider controls

I'm extracting this question from the various discussions in several forums:

• https://github.com/w3c/csswg-drafts/issues/4410#issuecomment-1898417658
• https://github.com/whatwg/html/issues/4177#issuecomment-1882909538
• https://github.com/whatwg/html/issues/8413#issuecomment-1898434004
• https://github.com/openui/open-ui/issues/959

For slider controls (<input type=range>, <progress>, <meter>, potentially <input type=checkbox switch>, etc.) there is a desire to be able to control:

1. The orientation of the slider: horizontal vs. vertical.
2. The polarity/direction of the slider: which way is toward "more".
3. The writing mode and direction of any text associated with the control, such as tooltips.

In current browsers, #1 is controlled by the CSS writing-mode property, and #2 is controlled by the CSS direction property. This does allow full control of orientation and direction for sliders, and at least recently (thanks @dizhang168), this behavior is implemented interoperably, despite a lack of standards for this behavior. However, because of #3 (see https://github.com/whatwg/html/issues/4177#issuecomment-1882909538 in particular), it might make sense to have a specific CSS property to control the orientation and direction of slider type controls. One tricky detail will be getting it to behave predictably in the face of existing writing-mode/direction behavior, and maybe even the non-standard orient=vertical.

Start by reading the linked CSSWG, WHATWG, and Open UI discussions, then compare the existing writing-mode and direction behavior for range, progress, and meter controls. Done means defining a specific property and predictable interactions with writing-mode, direction, and the non-standard orient="vertical" behavior.