css-parsing-tests

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Update test suite

1

## Update the supported Syntax module to the 2021 version - [x] Use the new `urange` type - [x] Parse `url()` functions with a string as normal functions (already done,...

liZe

According to the [CSS Syntax draft](https://drafts.csswg.org/css-syntax/#would-start-an-identifier), an identifier can start with two minus signs (`--`). This is not supported in the parsing tests.

dbrnz

Existing test cases can be used to test CSS serialization by checking that `parse(serialize(parse(input))) == parse(input)` for any input, (_TODO:_ document this in the README) but we should add more...

SimonSapin

… are not tested. See http://www.w3.org/TR/css3-color/#css2-system https://github.com/mozilla-servo/rust-cssparser/issues/2

SimonSapin