What are non-standard tags in web development?

Non-standard tags in web development refer to tags that have custom names differing from their intended roles or established standards. These tags are often created for specific purposes by developers but do not conform to the widely recognized HTML specifications or best practices. As a result, these tags may not be supported by all web browsers or may behave unpredictably.

Using non-standard tags can lead to accessibility issues, as assistive technologies may not recognize them or understand their intended meaning, thereby excluding users who rely on these technologies. Therefore, opting for standard tags that align with established HTML guidelines is crucial for ensuring consistency, compatibility, and accessibility across different platforms and devices. Non-standard tags, while potentially useful in isolated contexts, can ultimately hinder the broader goal of creating a universally accessible web experience.