WCAG 3.0 is an active W3C Working Draft in development by the AGWG. Requirements, assertions, the conformance model and reporting tiers are still being developed and may change. The latest published draft is the 10 September 2026 Working Draft; this site follows the editors’ draft, which also includes exploratory provisions.
An organisational assertion, relevant when video needs a player that standard browsers do not provide: the organisation states which media-alternative features its video player supports - closed captions in a standard format, turning captions and audio descriptions on and off, restyling and repositioning captions, and changing the audio description language.
Why It Matters
Captions and descriptions only help if the player exposes them and lets people adjust them. Caption styling in particular is what makes them readable for people with low vision.
a video is used that does not play in standard browsers.
Test Procedure from the W3C Draft
Upstream has a test heading for this provision but has not written
the procedure yet, and no test steps have been written here.
Generic advice would apply to almost any provision, so none is shown.
W3C Working Group Status
W3C Maturity Status:developing
Track / Group:images-and-media
The draft records no open editors' notes on this provision.
W3C Threads on This Provision
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is no recorded discussion to show. Cross-cutting threads that name no
provision are listed on the
Discussions page.
WCAG 2.2 Criteria That Map Here
From this site's reviewed WCAG 2.2 → WCAG 3 map. The map is
an interpretation, not a W3C mapping: W3C has not published one yet.
No mapping recorded. No WCAG 2.2 criterion in
this site's map is recorded as a predecessor of this provision.
[Title, role, or organization] asserts that:
* We provide a video player that supports appropriate media alternatives. The video player includes the following features [list all that apply]:
* supports closed captions in a standard caption format
* turning captions on and off
* turning audio descriptions on and off
* adjusting caption styles, including but not limited to: font size, font weight, font style, font color, background color, background transparency, and placement
* changing the location of captions
* changing the language of the audio descriptions
:::applies-when
- a video is used that does not play in standard browsers.
:::
::assertion-required
* title, role, or organization making the assertion (if different from the conformance claim)
* date of assertion (if different from the date of the conformance claim)
* feature included from the list
::assertion-recommended
* video player documentation detailing functional support for media alternatives