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  Principle Web Standards Requirements Priority                           Perceivable Text alternatives for images Text alternatives for images A           Time-Based Media Pre-recorded audio only & video only A   Pre-recorded Captions A   Pre-recorded audio description or media alternative A   live captions AA   pre-recorded audio description AA   Pre-recorded Sign Language  AAA   Pre-recorded Extended Audio Description AAA   Pre-recorded Media Alternative AAA   Live Audio only AAA     Adaptable view Info & relationships  A   Meaningful Sequence A   Sensory Characteristics A     Distinguishable Use of colour  A   Audio control A   Resize Text  AA   Contrast (maximum) AAA   Low or no background noise  AAA   Visual presentation AAA   Images of Text (no exceptions)...

The reason that these standards are important is to create a equalisation for web usage across the human population, according to the World health organisation about 15% of the world population have disabilities, around 3.8% of people aged 15yrs + have significant difficulties affecting their functioning, these standards allow this percentage of people to have access to the web sites & interface.   The level of importance (priority) is described by:  1.       Level A  = the lowest, a basic requirement the developer must meet failure to do so will be one or more groups that will NOT be able to access the content. 2.       Level AA  = Moderate, the developer should meet these requirements to remove significant barriers failure to do so will mean that one or more groups will find it hard to access the content 3.       Level AAA  = the Highest, the developer can address these to ensure gr...