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Now that we support non-integer percentages, the parsing rules read: "One or more ASCII digits. An optional U+002E DOT character (.). One or more ASCII digits." However, I think this means all percentage values must have at least 2 digits, since omitting the DOT character leaves us with two "One or more ASCII digits" lines. I'm not sure that is what is intended.
*** This bug has been marked as a duplicate of bug 23297 ***