[whatwg] [CSSWG][css-display-3] CR of CSS Display Level 3

[fantasai]

The CSS WG has published a Candidate Recommendation and invites
implementations of the CSS Display Module Level 3:

     https://www.w3.org/TR/css-display-3/

CSS Display describes how the CSS formatting box tree is generated
from the document element tree and defines properties that control
the types of boxes thus generated.

New features since Level 2 include:
   * new two-keyword syntaxes for various display types
   * inline list-items
   * run-ins
   * 'display: contents' to replace an element with its contents

The draft also features
   * A normative description of the CSS box generation model
     https://www.w3.org/TR/2018/CR-css-display-3-20180828/#intro
   * Definitions for blockification and inlinification
     https://www.w3.org/TR/2018/CR-css-display-3-20180828/#transformations
   * A glossary of key box model terms (largely extracted from CSS2.1)
     https://www.w3.org/TR/2018/CR-css-display-3-20180828/#glossary

Significant changes since earlier drafts are listed at:
   https://www.w3.org/TR/2018/CR-css-display-3-20180828/#changes
Disposition of comments:
   https://drafts.csswg.org/css-display-3/issues-wd-2017

Please review the draft, and send any comments to the www-style list,
<www-style at w3.org>, prefixed with [css-display] (as I did on this
message) or (preferably) file them in the GitHub repository at
   https://github.com/w3c/csswg-drafts/issues

For the CSS WG,
~fantasai