[css-om] logical properties api?

[bkardell]

The CSSOM exposes getClientRects(). However, occasionally (and perhaps increasingly) as authors begin thinking about CSS Logical Properties, it can be useful to think about these things with an eye toward how they are being used in a given writing mode. It seems potentially interesting, useful, and perhaps good for parity to consider adding some API surface that would allow this without having to invent your own API to do it.

h/t to @jonathantneal for bringing this up and asking the question/providing the gist illustrating a thing he was developing in order to experiment with some needs he was exploring himself here...