Visual Assistance

When choosing colors for text or elements on a website, the contrast between them needs to be considered. For WCAG 2.0 AA, this means that the contrast ratio for text or visual representations of text needs to be at least 4.5:1.

Color can help a user's understanding of information, but it should never be the only way to convey information to a user. For example, a user with red/green color-blindness may have trouble discerning at a glance if an alert is informing them of success or failure.

Audiovisual elements in the application such as video, sound effects or audio (ie. podcasts) need related textual representations such as transcripts, captions or descriptions. They also should never auto-play and playback controls should be provided to the user.