Quick reference: Web Content Accessibility Guidelines (WCAG) 2.0
Success criterion 1.1.1 - Non-text Content
All non-text content that is presented to the user has a text alternative that serves the equivalent purpose, except for the situations listed below.
- Controls, Input: If non-text content is a control or accepts user input, then it has a name that describes its purpose. (Refer to Guideline 4.1 for additional requirements for controls and content that accepts user input.)
- Time-Based Media: If non-text content is time-based media, then text alternatives at least provide descriptive identification of the non-text content. (Refer to Guideline 1.2 for additional requirements for media.)
- If non-text content is a test or exercise that would be invalid if presented in text, then text alternatives at least provide descriptive identification of the non-text content.:
- Sensory: If non-text content is primarily intended to create a specific sensory experience, then text alternatives at least provide descriptive identification of the non-text content.
- CAPTCHA: If the purpose of non-text content is to confirm that content is being accessed by a person rather than a computer, then text alternatives that identify and describe the purpose of the non-text content are provided, and alternative forms of CAPTCHA using output modes for different types of sensory perception are provided to accommodate different disabilities.
- Decoration, Formatting, Invisible: If non-text content is pure decoration, is used only for visual formatting, or is not presented to users, then it is implemented in a way that it can be ignored by assistive technology.
Display success criteria:
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Principles, guidelines and success criteria
Principle 1 - Perceivable - Information and user interface components must be presentable to users in ways they can perceive.
- Auswahl: Success criterion 1.1.1 - Non-text Content [Level A]
Principle 2 - Operable - User interface components and navigation must be operable.
Principle 3 - Understandable - Information and the operation of user interface must be understandable.
Principle 4 - Robust - Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.
Conformance Requirements
In order for a Web page to conform to WCAG 2.0, all of the following conformance requirements must be satisfied:
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Accessible web design