Re: [filter-effects] apply filter to border and background

Brad Kemper

On Aug 17, 2012, at 10:02 AM, "Tab Atkins Jr." <> wrote:

> On Thu, Aug 16, 2012 at 6:09 PM, Dirk Schulze <> wrote:
>> Hi CSS folks,
>> I created an initial Wiki page for discussing a request of the CSS WG to support filter effects on just backgrounds or just borders as well. [1]
>> I want to collect proposals as well as pros and cons to find the best decision to address this request.
>> a) The first proposal is adding new properties for background and border:
>> * 'background-filter'
>> * 'border-filter'
>> These properties have the same syntax and semantic as the 'filter' property.
>> The benefit that I see is that you can apply different filters to different component of an element (border, mask or content). But it means adding two new properties.
>> b) The second proposal is adding a new keyword to Filter Effects named 'filter-target' with the keywords
>> * border
>> * background
>> * group
>> * (content)
>> 'content' might not be necessary, since you can group child elements and filter the whole group.
>> The benefit is that we just need one new property that is defined within Filter Effects and without modification of CSS Backgrounds and Borders.
>> It seems to be harder to define different filters to different components (filter1 on the border, filter2 on the background).
>> SVG may also apply filters on different components of a shape. This could be done with the SVG Vector Effects proposal [2]. The 'filter' property would just be applied to each single vector effect.
>> Greetings,
>> Dirk
>> [1]
>> [2]
> Brad Kemper's old proposal from the 2009 TPAC was to accompany each
> filter with a list of keywords representing filterable sub-parts of
> the element, and the filter would be applied to the union of those
> subparts.
> I think his pieces were [ [ border || background || text ] | all ],
> with filters assuming "all" if not otherwise specified.  Brad can
> correct me with pointers to his old proposal, though.

I'll try to dig that up when I get home tonight. I think I had plus signs when they should be filtered as a group, and spaces to filter them individually. And I think I had 'content' instead of 'text'. 

Received on Friday, 17 August 2012 21:33:41 UTC