Web Accessibility Coordination (WAC)

  1. WAC Home
  2. State of UNCG Web Accessibility
    1. 2005—2006
  3. Accessibility Guidelines
    1. Text, Fonts, and Colors
    2. Graphics, Multimedia and Dynamic Content
    3. Image Maps
    4. Tables
    5. Frames
    6. Style Sheets
    7. Scripts, Applets, PDF Files, & Other Applications
    8. Interactivity
    9. Navigation
    10. Programming & Structure
    11. Text-Only Page
  4. Web Accessibility Tools
  5. Web Accessibility Audit
    1. Instructions
    2. Audit Instrument

Graphics, Multimedia and Dynamic Content

Summary

Non-text materials cannot be read by screen readers and text-only browsers. Provide text alternatives.

Guidelines

  1. Use the ALT attribute to provide text equivalents for all IMG elements
  2. Provide text equivalents for all other non-text items
  3. Provide equivalent alternatives for any multimedia presentation and synchronize these alternatives with the presentation
  4. People with photosensitive epilepsy can have seizures triggered by flickering or flashing in the 4 to 59 flashes per second (Hertz) range with a peak sensitivity at 20 flashes per second as well as quick changes from dark to light (like strobe lights). If you include animated gif images or other refreshing content that cause the screen to flicker, avoid causing a flicker with a frequency greater than 2 Hertz and lower than 55 Hertz.
  5. Until user agents provide the ability to stop the refresh, do not create periodically auto-refreshing pages.
  6. When an appropriate markup language exists, use markup rather than images to convey information. For example, MathML, CML
  7. Until user agents provide the ability to stop auto-redirect, do not use markup to redirect pages automatically. Instead, configure the server to perform redirect

See Also

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Page updated: 06-Feb-2006

Accessibility Policy

Page Issues? SAF Web Admin

Web Accessibility Coordinators (WAC)
The University of North Carolina at Greensboro
Greensboro, NC 27402-6170