Intent to prototype: Houdini CSS Properties and Values API

[Zach Hoffman]

Summary: Lets you register and use custom properties that have
* types
* customizable inheritance
* an initial value

using either the new @property at-rule in CSS or CSS.registerProperty()
in JavaScript.

Typed custom properties can also be interpolated in animations and
transitions.

Bug: <https://bugzil.la/1273706>

Specification:
<https://drafts.css-houdini.org/css-properties-values-api-1/>

Standards Body: CSS-TAG Houdini Task Force (W3C)

Platform coverage: All

Preference: layout.css.properties-and-values.enabled

DevTools bug: <https://bugzil.la/1840987>

Link to standards-positions discussion:
<https://github.com/mozilla/standards-positions/issues/93> and
<https://github.com/mozilla/standards-positions/issues/331> (@property)
web-platform-tests:
<https://wpt.fyi/results/css/css-properties-values-api>

Other browsers: Both Blink and WebKit are already shipping.

-Zach

[Sebastian Zartner]

For what it's worth, I just filed the more general bug https://bugzil.la/1841021 for DevTools support.

Sebastian

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