In order for customized list items to be accessible, they must be marked up correctly.
FAIL: Avoid using images as bullets in lists in the HTML file.
SOLUTION: Remove the image bullets from the HTML and use CSS to generate the bullets
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WCAG 2.1: 312 checkpoints covering A, AA and AAA W3 accessibility guidelines
Section 508: 15 US federal guidelines covered by 59 accessibility checkpoints