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CSS @mixin

Proposed by web-platform-tests/interop#1359
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The @mixin CSS at-rule enables defining reusable and parametrizable block of CSS. Once defined, a mixin can be called using the syntax @apply --mixin-name(<parameters>);.

This feature being prototyped in Chrome

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Strict feedback template: Please be as concrete as possible. Specific examples from your production apps or projects provide the highest-value signal to standards editors and browser engineers.
Add your specific real-world use cases, even if they seem obvious to you.
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Are you having to use another feature instead, a polyfill, or is it blocking you completely? Why are the alternatives worse?
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