Does CSS have a rule against trailing zeros?

Is writing a property in the form width: 90.0%; non-valid CSS, or is that some rule that JSFiddle made up?

Solution

According to the CSS BNF (https://www.w3.org/TR/css-syntax-3/) that should be legal.

https://www.w3.org/TR/css-syntax-3/#percentage-token-diagram
https://www.w3.org/TR/css-syntax-3/#number-token-diagram

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