The HTML DOM is a programming interface for HTML and XML documents. When a web page is loaded, the browser creates a Document Object Model of the page, structured as a tree of objects that represent HTML elements. JavaScript uses the DOM to interact with and manipulate the content, structure, and styles of the page.

The HTML DOM (Document Object Model) represents the structure of HTML documents as a tree of objects. Each element becomes a node in this tree, allowing JavaScript to access and modify the page dynamically.

Using the DOM, JavaScript can:

• Change all HTML elements
• Change HTML attributes
• Modify CSS styles
• Remove or add HTML elements and attributes
• Respond to existing events
• Create new events

The DOM is defined by the W3C as a standard for accessing and manipulating documents. It is a platform and language-neutral interface that lets scripts dynamically update the content, structure, and style of a document.

• Core DOM – Standard model for all document types
• XML DOM – Standard model for XML documents
• HTML DOM – Standard model for HTML documents

The HTML DOM defines:

• HTML elements as objects
• The properties of all HTML elements
• The methods to access all HTML elements
• The events for all HTML elements