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.
developingCore requirement
Change Of User Agent Notified
Group: user-control • Guideline: content-changes
Summary in Plain English
When content triggers a device change or an automatic change of user agent, the user is told before it happens.
Why It Matters
Being thrown into another app or device mid-task can drop assistive technology settings and abandon work in progress.
For each instance where the content triggers a change of device or user agent change:
Check that the change is conveyed before the chance occurs.
Expected results
#1 is true.
W3C Working Group Status
W3C Maturity Status:developing
Track / Group:user-control
The draft records no open editors' notes on this provision.
W3C Threads on This Provision
No GitHub issue in w3c/wcag3 carries this provision's label, so there
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.
Related WCAG 2.2 criteria
On a neighbouring subject, but this provision doesn't replace them.