What does the phrase element DFN signify in a document?

The phrase element DFN is used in HTML and other markup languages to specifically indicate the defining instance of a term or concept. When you use the DFN element around a word or phrase, you are marking it as a term that is being defined or introduced in that context. This provides clarity to both users and assistive technologies, ensuring that the importance of the term is communicated effectively.

Using DFN correctly enhances accessibility by signaling to screen readers and other assistive technologies that the enclosed term has a specific significance or is being established for the first time in the document. This helps users understand the content better, especially when they encounter technical jargon or specialized vocabulary.

The other options do not accurately represent the function of the DFN element. While it may be tempting to associate it with computer code fragments or variables, those interpretations do not align with DFN’s primary role in defining terms. Similarly, the notion of an abbreviated form does not capture its purpose in providing definitions, making the correct choice clear.