What do WCAG 2.1 success criteria provide to web developers?

The success criteria outlined by WCAG 2.1 provide specific, testable measures for conformance levels related to web accessibility. This means that web developers can use these criteria to evaluate whether their websites meet established accessibility standards. The criteria are designed to be clear and measurable, allowing developers to confirm compliance with different levels—A, AA, or AAA—based on the specific needs and contexts of their users.

Achieving conformance means that a website will be more accessible to individuals with disabilities, covering a wide range of disabilities including visual, auditory, motor, and cognitive impairments. By adhering to these testable measures, developers ensure that accessibility is not just a recommendation, but a verifiable outcome that can significantly enhance user experience for all individuals.

The other options focus on design aspects, coding examples, or graphic design recommendations, which, while important in the web development process, do not directly address the structured, measurable criteria that WCAG 2.1 provides for ensuring accessibility conformance.