> On Feb 8, 2016, at 6:18 pm, Robert O'Callahan <rob...@ocallahan.org> wrote: > > On Sun, Feb 7, 2016 at 12:14 AM, Sebastian Zartner > <sebastianzart...@gmail.com <mailto:sebastianzart...@gmail.com>> wrote: > On 6 February 2016 at 09:28, Robert O'Callahan <rob...@ocallahan.org > <mailto:rob...@ocallahan.org>> wrote: > Implementing ::backdrop for every element would be pretty hard for us and not > something I'd want to do. > > > Can you elaborate on this? > > ::backdrop only applies to "top layer" elements so there's some > special-casing we can do to simplify the layout and rendering of ::backdrop. > If you allow ::backdrop on non-top-layer elements then it can appear anywhere. > > And would it generally be hard to implement or only for Mozilla? > > I don't know. > > And if it's generally hard to implement, let's discuss another solution. And > what about the other parts of the suggested approach? > > I guess I don't understand why we need backdrop-filter at all. Why can't > authors use BackgroundImage with the 'filter' property to get the same > effects? Is it because they'd have to use SVG filters and a standalone CSS > property is easier to use?
I’m trying to find out where this “BackgroundImage” thing is specified and failing. I assume it’s different to CSS background-image, give your statement that it could be used for backdrop filters? Simon
