Why do you need to escape css values?

I see [this](https://github.com/chenglou/RCSS/blob/64d92ce937f0d9fa4defc60e34d79e5e05c676ae/__tests__/styleRuleConverter-test.js#L52) and I can't see any valid use case which requires escaping.

Can you explain the rationale please?

Start with __tests__/styleRuleConverter-test.js at line 52 and inspect the escaping behavior and nearby expectations. Determine whether the test reflects a required CSS case; done means the rationale is answered clearly, with the relevant behavior documented or the test's necessity resolved.

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