Ensure 200% text resizing
The WCAG 2.0 recommendation states that the entire website text must be resizable up to 200% without assistive technology and loss of content or functionality. You should also apply this guideline for touch displays and pinch-zooming behaviors. What seems like a small detail has a significant impact on people with visual disabilities. Instead of holding their devices right in front of their noses to see and read the content, they can simply zoom in.
Pro Tip: Skip this requirement for captions and image text.