Perceivable principle

This principle speaks to the need for web content to be made available to all the senses such as sight, hearing and/or touch. It involves:

Providing text and/or auditory alternatives for non-text content allowing it to be changed into other forms i.e. large print, Braille, speech, symbols or simpler language.
Preserving information and relationships that are implied by visual or auditory formatting when the presentation format changes.
Ensuring that the reading and navigation order are the same regardless of screen size, screen orientation (portrait/landscape), assistive technology, etc.
Making sure that the instructions do not rely on any auditory (beeping) or visual queues (shape, size, location e.g. click the square icon to continue) only.
Making it easier for users to see and hear content including but not limited to:
- effective colour contrast
- responsive images and text
- mechanisms to stop, pause, mute and adjust volume

Applicable criterions