Encyclopedia / Quality
Accessibility (a11y)
Making the site usable by everyone, including people using assistive technology.
Check text contrast (4.5:1), keyboard navigation with visible focus, alt text, form labels, semantic HTML and respect for reduced motion. The WCAG guidelines are the reference. Much of what helps screen readers also helps crawlers.
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More in Quality
Speed, accessibility, security and measurement, which every other layer depends on.