HTML markup works by using a set of tags and attributes to structure and define content on a web page. These tags and attributes allow developers to create headings, paragraphs, lists, images, links, and other elements that make up a web page.

The basic structure of an HTML document is made up of several parts, including:

- declaration: This tells the browser what version of HTML the document is written in.
- element: This is the root element that contains all other elements on the page.
- element: This contains meta data about the document, such as the title and description.
- element: This contains the main content of the page, such as text, images, and other media.

Within the element, developers can use various tags and attributes to structure and format content. For example:

element: This creates a large heading.
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element: This creates a paragraph of text.
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and
elements: These create an unordered list of items.
- element: This inserts an image onto the page.
- element: This creates a hyperlink to another page or resource.

By using these tags and attributes in combination, developers can create complex, multimedia-rich web pages that can be accessed and viewed by anyone with an internet connection.

How does HTML markup work?