Which keyword is commonly used to implement semantic HTML elements?

The keyword that is commonly used to implement semantic HTML elements is "article." Semantic HTML elements provide meaning and help convey the structure of the content of a webpage to both the browser and the developer.

The "article" element is specifically designed to represent independent content that is relevant on its own, such as a blog post, news article, or any related information. By using "article," you enhance the accessibility of the document and clarify to search engines or assistive technologies what the content represents. This is a key aspect of building web pages that are not only functional but also meaningful and easier to navigate for users.

While there are other tags such as "div" and "span," these are not semantic elements; they are generic containers that do not convey any meaning about their content. The "section" element, on the other hand, is also semantic, but it is used to define a thematic grouping of content, while "article" focuses on standalone content. Therefore, "article" is more directly associated with semantic HTML, making it the correct choice.