On Monday 2015-11-02 08:37 -0800, Simon Fraser wrote: > > On Nov 1, 2015, at 7:40 PM, Darin Adler <da...@apple.com> wrote: > > > > Hi folks. > > > > Our engine supports alpha values from 0-255. But when we serialize them, we > > turn them into floating point values. When we do that, we include way too > > many digits of precision. For example, the alpha value 127 becomes 0.498039. > > > > I like the idea of writing the minimum number of digits that are needed to > > round trip. So 127 would become 0.498 or even maybe 0.49 and 128 would > > become 0.5. > > > > Three questions: > > > > 1) Does the CSS specification allow or encourage this? > > As long as the values round-trip, I think itβs OK. > > > 2) Do you like this idea? > > I would like to know what other browsers do.
For what it's worth, Gecko does have code to produce a minimal-length alpha value. nsStyleUtil::ColorComponentToFloat just tries rounding to 2 decimal places, sees if the resulting float round-trips back to the same 0-255 alpha value, and if it doesn't, rounds to 3 places. -David -- π L. David Baron http://dbaron.org/ π π’ Mozilla https://www.mozilla.org/ π Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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