Add support for @container #18
Description
This has an existing pull request : #15
- specification : https://drafts.csswg.org/css-contain-3/#container-rule
- wpt : https://wpt.fyi/results/css/css-contain/container-queries?label=master&label=experimental&aligned&q=container
- mdn docs : https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_container_queries
- shipped in all browsers
This feature is very tricky to implement safely without a working test suite