[w3ctag/design-reviews] CSS Logical Properties and Values (#286)

Hello TAG！

I'm requesting a TAG review of:

  - Name: CSS Logical Properties and Values Level 1, except [features not ready for shipping according to spec editors](https://drafts.csswg.org/css-logical-1/#issue-b84049ec).
  - Specification URL: https://drafts.csswg.org/css-logical-1/
  - Explainer, Requirements Doc, or Example code: https://docs.google.com/document/d/111ol5b6BHHIiQyOzybs8PVjn0MqKvyFzP-fwGC5-fuA/edit#heading=h.5hghvy5jlwvp
  - Tests: https://github.com/web-platform-tests/wpt/tree/master/css/css-logical (more tests need to be added).
  - Primary contacts: @Loirooriol, @mrego

You should also know that...

Firefox already shipped most of the logical properties and values: https://lists.w3.org/Archives/Public/www-style/2015Jul/0040.html

Blink also implemented various logical properties, but mostly with a `-webkit-` prefix. The intent to implement and ship is https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/48OwfwZrbvI

According to @fantasai,
> We haven't had TAG review specifically, but i18n reviewed it ages ago.
> HTML also has a dependency on these properties for the UA style sheet: they were necessary to implement HTML default styling in a world where writing-mode exists, so both the WHATWG and W3C specs rely on it. 
> CSSWG cleared it for shipping when Firefox brought up the issue awhile back. You can't ship writing-mode for the Web without this feature. More info in the FPWD announcement at https://lists.w3.org/Archives/Public/www-style/2017Dec/0043.html

We'd prefer the TAG provide feedback as (please select one):

  - [X] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]

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