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HyperText Markup Language (HTML) is the set of markup symbols or codes inserted into a file intended for display on the Internet. The markup tells web browsers how to display a web page's words and images.
Understanding basic HTML defines to know about, its structure, definition, explanation, etc. Like - All HTML documents must start with a document type declaration: <!DOCTYPE html>. The HTML document itself begins with <html> and ends with </html>. The visible part of the HTML document is between <body> and </body>.
Intermediate HTML includes to know more in detail about it, like - Knowing most of HTML tags in the language, understanding when to use tags, example the children of a <ul> tag should be <li> in most cases, the client-server relationship in the abstract, how to use attributes to style and identification for tags,how to link external resources like CSS, and JavaScript into your HTML, an understanding of the Document Object Model or DOM works, how your HTML will be read by accessible hardware such as screen readers.
An API (or application programming interface) is “is a set of subroutine definitions, protocols, and tools for building application software.” In an HTML API, the definitions and protocols are in the HTML itself, and the tools look in HTML for the configuration.