See CefAccessibilityHandler:
https://github.com/chromiumembedded/cef/search?q=CefAccessibilityHandler
Related:
--force-renderer-accessibilitytests/cefclient/browser/osr_accessibility_* files:
Doc comments from cef_browser.h:
///
// Set accessibility state for all frames. |accessibility_state| may be
// default, enabled or disabled. If |accessibility_state| is STATE_DEFAULT
// then accessibility will be disabled by default and the state may be further
// controlled with the "force-renderer-accessibility" and
// "disable-renderer-accessibility" command-line switches. If
// |accessibility_state| is STATE_ENABLED then accessibility will be enabled.
// If |accessibility_state| is STATE_DISABLED then accessibility will be
// completely disabled.
//
// For windowed browsers accessibility will be enabled in Complete mode (which
// corresponds to kAccessibilityModeComplete in Chromium). In this mode all
// platform accessibility objects will be created and managed by Chromium's
// internal implementation. The client needs only to detect the screen reader
// and call this method appropriately. For example, on macOS the client can
// handle the @"AXEnhancedUserInterface" accessibility attribute to detect
// VoiceOver state changes and on Windows the client can handle WM_GETOBJECT
// with OBJID_CLIENT to detect accessibility readers.
//
// For windowless browsers accessibility will be enabled in TreeOnly mode
// (which corresponds to kAccessibilityModeWebContentsOnly in Chromium). In
// this mode renderer accessibility is enabled, the full tree is computed, and
// events are passed to CefAccessibiltyHandler, but platform accessibility
// objects are not created. The client may implement platform accessibility
// objects using CefAccessibiltyHandler callbacks if desired.
///
/*--cef()--*/
virtual void SetAccessibilityState(cef_state_t accessibility_state) = 0;
For implementation hints see calls to SetAccessibilityState in upstream CEF source codes:
https://github.com/chromiumembedded/cef/search?q=SetAccessibilityState&unscoped_q=SetAccessibilityState
See chrome://accessibility url.
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