Content Accessibility Checklist Use high contrast colors. Check color contrast with eyedropper tools. Do not rely on color alone ("in green") or a single sensory characteristic ("at left") to convey meaning. Write alternative text that describes what each image means in context. Use text. Avoid images of text. Write meaningful links that work out of context; not "click here to learn more." Structure content with headings, lists and table headers. Tag language switches, or "Español" becomes "A spaniel." Provide captions or transcripts for video and audio. Avoid PDF documents, except as optional downloads. Test new designs with people, mobile phones, and automated tools.