Which of the following are considered failures in web accessibility?

The choice that highlights elements causing accessibility barriers is considered a failure in web accessibility because it directly impacts individuals with disabilities. These barriers can prevent users from interacting with web content effectively, leading to exclusion. For instance, if a website relies solely on color to convey information, individuals with color vision deficiencies may struggle to interpret that information, thereby failing to provide an equitable user experience.

In contrast, techniques that enhance user experience are typically aimed at improving usability for all users and are not inherently linked to accessibility failures. Visually appealing design choices do not necessarily equate to accessibility; a design can be attractive yet still fail to accommodate users with disabilities. Fully compliant content with accessibility guidelines indicates that the content has been structured in a way that abides by established standards, promoting inclusivity rather than signifying a failure.