Re: ACTION-2239: Review media queries level 5

There is now a Wiki page for our collection of use cases for envisioned
media features for personalization:
.  Feel free to add your features and descriptions.


At the end, I have added a section on "Other use cases that would replace
the need for a user style sheet".  This section includes proposed media
"parameters" that would be useful to eliminate the need for creating a user
style sheet.  This would require a different mechanism than media queries;
but we may be able to discuss this need with css wg in the context of media


The goal of this document is to discuss it with the CSS working group for
the development of Media Queries Level 5
<> .


Best regards,



Von: Gottfried Zimmermann (Lists)
Gesendet: Dienstag, 30. Juni 2020 21:13
An: 'W3C WAI Accessible Platform Architectures' <>
Betreff: ACTION-2239: Review media queries level 5


 <> Action item 2239 has been
on my list for a long time. I propose we discuss our response to the CSS
working group, in particular with regard to additional media features that
we might envision.  Note: I plan to be on the APA call tomorrow.


Here is my draft for discussion:




Media queries level 5 holds promises towards personal user interfaces on the
Web.  We welcome the new media features, in particular those that can help
to meet a user's specific needs due to a disability or situational
circumstances (e.g. user preference and environment media features).
Although we share your concerns about active fingerprinting, we do not see
an alternative solution that provides similar opportunities for automatic
personalization of user interfaces on the web.


If possible, we would like to see additional media features expressing user
preferences for the sake of accessibility (cf. Christophe Strobbe's
inventory of GPII common terms at

.       captionsEnabled: true / false. Captions could be enabled

.       audioDescriptionEnabled: true / false. An alternative video (with
AD) could be loaded.

.       signLanguageEnabled: true / false. An alternative video (in sign
language) could be loaded.

.       signLanguage: language tag conforming to IETF BCP 47, for selecting
an appropriate sign language video.

.       pictogramsEnabled (true / false): Determines whether pictograms
should be added to support people with a reading disability or a general
cognitive disability.

.       displaySkiplinks (always, onfocus, never). Authors could show or
suppress a skip-link.

.       tableOfContents (true / false): Authors could show a table of
contents at the beginning of a page.

.       sessionTimeout (Integer in seconds): Determines how many seconds a
user can remain inactive before a session times out. People with certain
specific disabilities need longer session timeouts. This would serve a need
in WCAG 2, SC 2.2.1 Timing Adjustable (A).

.       selfVoicingEnabled (true / false): Determines whether a Web
application's self-voicing feature should be enabled.




Best regards,





 Prof. Dr. Gottfried Zimmermann

Access Technologies Group, Germany



Received on Tuesday, 11 August 2020 16:17:34 UTC