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Things to avoid

Spawning New Windows or Tabs#

Spawning new windows breaks the browser ‘Back’ button leaving some sighted keyboard navigator stranded without any means of returning to the original page. For that reason, please avoid links and other elements that open a new window or tab. If you really, really, have to spawn a new window or tab, place a warning in clear text (preferably as part of the link or control text) so that users can make an informed choice.

Autoplay & Animations#

Autoplay isssues apply to:

  • Sound — creates problems for screen reader users who may find their software’s output drowned out by the site’s audio.
  • Animations (Flash or .gif images) — can trigger photo-epileptic seizures in some situations.
  • Slideshows — may create issues for screen reader users (who are presented with continuously changing content) and sighted keyboard navigators (who may be unable to move past the slideshow).
  • Other special effects — effects such as falling snow have been known to trigger photo-epileptic seizures.

For more technical informations, here is a customizable quick reference to Web Content Accessibility Guidelines (WCAG) 2 requirements (success criteria) and techniques. - https://www.w3.org/WAI/WCAG21/quickref/?versions=2.0