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2bweb.biz Significance of Accessibility

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Quick reference: Web Content Accessibility Guidelines (WCAG) 2.0

Success criterion 1.4.7 - Low or No Background Audio

For prerecorded audio-only content that (1) contains primarily speech in the foreground, (2) is not an audio CAPTCHA or audio logo, and (3) is not vocalization intended to be primarily musical expression such as singing or rapping, at least one of the following is true: (Level AAA)

  • No Background: The audio does not contain background sounds.
  • Turn Off: The background sounds can be turned off.
  • 20 dB: The background sounds are at least 20 decibels lower than the foreground speech content, with the exception of occasional sounds that last for only one or two seconds.
Note: Per the definition of "decibel," background sound that meets this requirement will be approximately four times quieter than the foreground speech content.

Display success criteria:

Currently 61 of 61 Success Criteria are being displayed.

Principles, guidelines and success criteria

Principle 1 - Perceivable - Information and user interface components must be presentable to users in ways they can perceive.

Guideline 1.1 - Text Alternatives

Guideline 1.2 - Time-based Media

Guideline 1.3 - Adaptable

Guideline 1.4 - Distinguishable

Principle 2 - Operable - User interface components and navigation must be operable.

Guideline 2.1 - Keyboard Accessible

Guideline 2.2 - Enough Time

Guideline 2.3 - Seizures

Guideline 2.4 - Navigable

Principle 3 - Understandable - Information and the operation of user interface must be understandable.

Guideline 3.1 - Readable

Guideline 3.2 - Predictable

Guideline 3.3 - Input Assistance

Principle 4 - Robust - Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

Guideline 4.1 - Compatible

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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