ADA web accessibility compliance ultimately requires that developers get into the weeds of the 78 guidelines that make up WCAG 2.1. Visual checks and quick scans provide a solid starting point, however, and serve as key indicators of underlying accessibility violations. 

Here’s an overview of the essential factors to consider with developing or auditing a website for accessibility.

Contrast
Non-text content
Link purpose
Labels and instructions
Information and relationships
Keyboard navigation