This button has text on it that says "W3C; WAI-AAA WCAG 1.0" (sorry about all of the acronyms, but that is what it says!). This "translates" to "World Wide Web Consortium; Web Accessibility Initiative, Level Triple-A. Web Content Accessibility Guidelines 1.0." Pages that meet the Web Content Accessibility Guidelines 1.0 Priority Levels 1, 2, and 3 (i.e. all priority levels) may display this icon.
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