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Re: [css3-color][css-compositing][css-masking][filter-effects] Effect on focus ring

From: Rik Cabanier <cabanier@gmail.com>
Date: Mon, 4 Nov 2013 10:02:02 -0800
Message-ID: <CAGN7qDAQ5oYDtkPrW0AQP1f8eJkdZ1YKqB=fLWwLBY5WD6mhuw@mail.gmail.com>
To: Dirk Schulze <dschulze@adobe.com>
Cc: "public-fx@w3.org" <public-fx@w3.org>, www-style list <www-style@w3.org>
The assistive software draws it own separate focus for accessibility.
That one is not affected by the style of the element.


On Mon, Nov 4, 2013 at 9:31 AM, Dirk Schulze <dschulze@adobe.com> wrote:

>
> On Nov 4, 2013, at 6:19 PM, Rik Cabanier <cabanier@gmail.com> wrote:
>
> Hi Dirk,
>
> are you worried about this for accessibility reasons or because you
> believe it doesn't look right aesthetically ?
>
>
> Just for accessibility reasons.
>
> Greetings,
> Dirk
>
>
>
> On Mon, Nov 4, 2013 at 1:09 AM, Dirk Schulze <dschulze@adobe.com> wrote:
>
>> Hi,
>>
>> While working on Filter Effects, I realized that the specifications CSS3
>> Color, CSS Compositing, CSS Masking and Filter Effects mention that they
>> affect all painting layers of an element. This of course include
>> background, border, content and would also include the outline.
>>
>> A focus ring is drawn on selected elements (i.e setting ’tabindex’
>> attribute on an element and tab to it). The focus ring is necessary for
>> accessibility reasons.
>>
>> All the graphical effects (‘mix-blend-mode’, ‘clip’, ‘mask’,
>> ‘mask-box-image’, ‘opacity’, ‘clip-path') seem to influence the focus ring
>> on UAs today (tested on WebKit, Blink Gecko).
>>
>> Some specification parts suggest that the ‘outline’ property can be used
>> to style a focus (:focus { outline: …} ). I am not sure if ‘outline’ is
>> really responsible for the focus ring. Looking at the visual output of the
>> property it could very well be.
>>
>> I start to wonder if that is really the desired effect and what it means
>> to accessibility if the focus ring gets transparent, blurred, clipped or
>> blended with the back drop.
>>
>> I see the burden to implementers to change the current behavior. On the
>> other hand it feels like all these effects should NOT have any influence on
>> color or density of the focus ring.
>>
>> Greetings,
>> Dirk
>>
>>
>>
>>
>
>
Received on Monday, 4 November 2013 18:02:31 UTC

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