Which principle does the criterion "label in name" correspond to?

The criterion "label in name" aligns with the principle of operable, which is one of the four principles of the Web Content Accessibility Guidelines (WCAG). The operable principle focuses on ensuring that users can navigate and interact with content effectively. To achieve this, all interface components, including labels, need to be recognizable and associated with their corresponding controls.

"Label in name" specifically refers to the requirement that the name of a user interface control must contain a text label that is programmatically associated with it. This allows assistive technologies, like screen readers, to convey to users what the control is intended to do, making it clear and actionable. This is crucial for users with disabilities, as it enhances their ability to operate the controls effectively and understand the functionality available to them on a webpage.

While the other principles—perceivable, understandable, and robust—are all essential for creating accessible content, "label in name" does not directly address aspects of how content is perceived or understood, nor does it pertain to the robustness of technologies used to interact with content. Therefore, operability is the most relevant principle associated with this criterion.