[Cassidy](https://github.com/jtauber/cassidy) is my very-much-in-progress implementation of CSS specs in Python.

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Just used `box-sizing: border-box;` in my CSS for the first time.

Context was an `input` I wanted to be `width: 100%`.

The site was this one :-)

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`vh` units can be used as input to `font-size`