On Thursday 2017-11-30 08:21 +1100, Xidorn Quan wrote: > On Thu, Nov 30, 2017, at 07:16 AM, Mats Palmgren wrote: > > I think supporting only a subset of the valid values for a property > > is problematic. > > > > CSS conformance rules says: > > "[...] the user agent must parse the value according to the property > > definition. This means that the user agent must accept all valid values > > and must ignore declarations with invalid values." > > https://www.w3.org/TR/CSS21/conform.html > > It simply means we cannot state we are conformant to that spec in stage > 1. That's not something seriously problematic. > > > Shipping support for a subset of the properties in a spec might make > > sense > > in some cases, but since you say: > > > > > The downside of the two-stage roll-out could raise web-compat issues > > > because Blink and Webkit already support the entire module. > > > > it's not probably not a good idea in this case, for web-compat reasons. > > I'm not too concerned about this, actually. It really depends on whether > web-compat issues from lacking of <image> support is worse than not > supporting the property at all. > > I would argue that it isn't the case. shape-outside is mostly a cosmetic > feature, and lack of support would unlikely cause anything more than > some undesired appearance. In that case, authors probably don't even > bother to use a feature detection at all. shape-outside itself has a > popularity of 0.49% on Chrome Platform Status, which seems to be > reasonably high, and I would be surprised if majority of that is using > <image> rather than the simpler shape functions. > > Because of that, I don't really think web-compat would be a big issue > for shipping this in two stages.
I agree with Xidorn's conclusions. I'm skeptical of one of the arguments, though, since I think "mostly a cosmetic feature" can be said about many things that cause webpages to be unusable when they don't work correctly. I think if the remainder of the feature can be done soon then it may make sense to wait to ship the whole thing together, but if there's something that makes the image part hard or unlikely to happen soon, then it's reasonable to ship the part we have done, as long as the part that we parse matches the part that we support. -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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