mechanism

process (opens in a new tab) or technique for achieving a result

Note 1: The mechanism may be explicitly provided in the content, or may be relied upon (opens in a new tab) to be provided by either the platform or by user agents (opens in a new tab), including assistive technologies (opens in a new tab).

Note 2: The mechanism needs to meet all success criteria for the conformance level claimed.

Source: WCAG 2.2 definition of “mechanism” (opens in a new tab) (W3C)