Hidden content on the page cannot be analyzed
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Informs users about hidden content that cannot be analyzed for accessibility violations
The Algorithm, in Simple Terms
Checks for style property values of ('display') === 'none') and ('visibility') === 'hidden') to alert to the presence of hidden item content in need of review.
Why this is Important
Hidden content cannot be automatically analyzed for accessibility rule violations.
How to Fix the Problem
You will need to trigger the display of this content in order to analyze it. A failure indicates there were problems analyzing the content on the page under test, whereas when "incomplete," there were hidden items identified that must be exposed in order to be analyzed. Passing of this rule (in other words, no violations found) indicates it was possible to analyze all of the content on the page and no hidden content was found.