Guidelines
WCAG and the widget
WCAG asks web content to be perceivable, operable, understandable, and robust.
CDPCaptcha does not claim a conformance level on this page.
Practice
How the widget lines up with those ideas.
What are the Web Content Accessibility Guidelines? is the longer explanation.
Perceive
Status you can hear
A live region exposes the state, so a screen reader can announce that the check is running or finished.
No picture grid
Operate
Keyboard
The button can be reached and used from the keyboard.
There is no drag gesture and no timed image task.
One control
Understand
Short text
The widget uses a small set of words for its state instead of a visual riddle.
Plain state
Robust
A button
The control is a button in the page, so common assistive tools can find it.
Standard control
Test with your own tools
Add the widget and check it with the screen reader and keyboard you already use.