Re: [filter-effects-2] Split functionality of 'filter' and 'backdrop-filter' into several properties

On Sun, Feb 7, 2016 at 12:14 AM, Sebastian Zartner <
sebastianzartner@gmail.com> wrote:

> On 6 February 2016 at 09:28, Robert O'Callahan <robert@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?

Rob
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