Silktide Index accessibility scores
Accessibility scores are based on the following test criteria:
Only a selection of web pages of each website are tested
Only the main website of each organization is tested
The accessibility score looks at how accessible a website is, as measured against the latest international standard for web accessibility, WCAG 2.2.
We believe Silktide performs the world’s most advanced automated assessment of web accessibility, so you may see issues you’ve not been aware of before.
Silktide tests for mobile accessibility, non-text contrast, tabbed browsing, and many other parts of WCAG 2.2. We don’t believe these tests are covered by other platforms.
Our tests cover all unambiguous criteria in WCAG 2.2. This means we only score websites for criteria that a computer can reliably assess by itself.
An accessibility rating does not purport to guarantee a level of compliance or non-compliance with the Americans with Disabilities Act.
The accessibility rating of every website in the Index is our opinion, as a result of a determination by Silktide’s proprietary software.
Unambiguous criteria in WCAG 2.2 testing
Silktide performs WCAG 2.2 accessibility tests against unambiguous criteria. What does this mean?
It means that in some cases, aspects of WCAG 2.2 are subjective. Computers are not yet intelligent enough to understand the nuance of language as a human being would.
An example of a pass/fail test in WCAG 2.2 which could appear subjective is Success Criterion 2.4.2: Page Titled.
The object of this criterion is to give each web page a descriptive title, to help users find content, orient themselves within it, and navigate through it.
The procedure for testing 2.4.2 is:
Check that the web page has a title
Check that the title is relevant to the content of the web page
Check that the web page can be identified using the title
A computer cannot tell if a title is appropriate to the content of the web page because it cannot understand the context.
The Silktide algorithm tries to identify a wide range of cases where the title is likely to be not relevant. For example, if the title contains a string of nonsensical characters or has a file extension.
Some human intervention is always required when a Success Criterion requires some context. Silktide provides 'assisted' checks where possible for ambiguous criteria, allowing platform users the opportunity to manually approve a page for tests 2 and 3.