What is the function of contrast in web design?

In web design, contrast plays a crucial role in enhancing the user's experience by effectively differentiating between various elements on a page. This differentiation helps guide users' attention to important areas, such as headings, buttons, and links. By employing contrast, designers can make certain elements stand out, thereby improving readability and accessibility. For instance, using contrasting colors between text and background ensures that the information is easily legible. Furthermore, contrast can be employed not only with color but also with size, shape, and spacing, creating a visual hierarchy that enables users to navigate the content more intuitively.

The other options focus on aspects of web design that do not directly relate to the concept of contrast. For example, improving site loading times relates to optimization techniques rather than visual elements, restricting content is a functional aspect of user permissions rather than visual design, and enhancing security measures pertains to site safety rather than layout or visual appeal.