The computed value of fill-opacity and stroke-opacity should never be a percentage

[jarek-foksa]

Currently the spec allows the computed value of fill-opacity and stroke-opacity to be either a number or a percentage.

This doesn't seem to be useful and it's inconsistent with the definition of "opacity" in CSS Color Module Level 4.

[longsonr]

The general rule for computed values is that the representation that uses the smallest number of characters wins. Firefox obeys that rule and only outputs numbers.

[AmeliaBR]

Agreed, the computed value should always be a number. The current Editor's draft of CSS Color 4 uses the following wording:

Computed value: the specified value converted to a number, clamped to the range [0,1]

That is clearer than the WD text, and much better than the SVG text, which allows two different representations of equal values.