Don't surprise or annoy:
How do you do this?
- Avoid flickering or flashing images/pages, text (W3C
Techniques for avoiding flicker)
- Warn users when a new window will open (e.g. when following
a URL or link from a content page) or if the existing page will
be changed after a certain time
- Warn users when the language of the text is about to change
(for example, to a foreign language, or other format)
Why? People with cognitive or visual disabilities
may be unable to read moving text or may be distracted by flickering
or moving text. Objects flickering at certain frequencies or changing
colour rapidly may trigger seizures in people with some forms of
epilepsy. Opening an unexpected window or changing the content of
the current window automatically may cause someone using Assistive
Technology or Adaptibe Browsers to 'lose their place' in your web site. The changed
page may not even be obvious to a non vision-impaired user.
Next Tip: Evaluate and
validate your html pages
These tips may be applied to any web site or Vista
course, and are derived from the World Wide Web Consortium
(W3C) Web
Accessibility Initiative but are not intended to reinterpret
them. Web developers are encouraged to access the W3C
Web Content Accessibility Guidelines Version 1.0, directly.
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