Which principle does contrast fall under?

Contrast falls under the principle of perceivable because it relates to how content is presented and how easily information can be seen and understood by users. The perceivable principle of the Web Content Accessibility Guidelines (WCAG) emphasizes that information and user interface components must be presented in ways that users can perceive them. Adequate contrast between text and background colors is crucial for individuals with visual impairments, including those with color blindness, to read and comprehend content effectively.

When contrast is insufficient, it becomes challenging for users to distinguish between elements on the page, potentially leading to barriers in access and understanding. Therefore, ensuring that there is sufficient contrast is a fundamental aspect of making web content perceivable to all users, aligning directly with this principle.