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Web Accessibility

Web accessibility is the practice of designing and building websites so people with disabilities can perceive, understand, navigate, and operate them. It connects content, semantic HTML, keyboard behavior, visual presentation, media alternatives, browsers, and assistive technologies.

itWeb development

Web Accessibility

Web accessibility is the practice of removing barriers that prevent people with disabilities from using websites and web applications. It covers the information people perceive, the controls they operate, and the code that browsers expose to assistive technologies. Accessible work begins in design and content, continues through implementation, and is checked throughout delivery.

Disability is not one interaction mode. A person may enlarge text, navigate with a keyboard, listen through a screen reader, use speech input, read captions, reduce motion, or combine several adaptations. Situational and temporary constraints can create similar needs. A bright outdoor screen changes contrast requirements. A broken arm changes input. A noisy room changes how someone consumes audio. Accessibility decisions therefore improve the range of conditions under which an interface remains usable.

The delivery path

A web page travels through several layers before a person uses it:

  1. Content and design define language, reading order, labels, alternatives, color, motion, and interaction intent.
  2. HTML, CSS, and JavaScript encode structure, presentation, state, and behavior.
  3. The browser creates the document object model, renders pixels, manages focus, and maps relevant semantics into an accessibility tree.
  4. Assistive technology uses browser accessibility APIs to present and control the interface in another form.
  5. The person perceives the result and completes a task through sight, sound, touch, keyboard, pointer, voice, or a combination.

A defect at one layer can survive every layer below it. An icon-only button without an accessible name may look complete but reach a screen reader as an unnamed button. A custom control with role="button" may be announced as a button while still lacking the keyboard behavior a native button supplies. Correct semantics and correct behavior must travel together.

WCAG as the shared requirement model

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