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With the HTML DOM, JavaScript can access and change all the elements of an HTML document.

HTML DOM (Document Object Model)

When a web page is loaded, the browser creates a Document Object Model of the page.
With the object model, JavaScript gets all the power it needs to create dynamic HTML:
JavaScript can change all the HTML elements in the page
JavaScript can change all the HTML attributes in the page
JavaScript can change all the CSS styles in the page
JavaScript can remove existing HTML elements and attributes
JavaScript can add new HTML elements and attributes
JavaScript can react to all existing HTML events in the page
JavaScript can create new HTML events in the page

What is the DOM?

The DOM defines a standard for accessing documents. "The Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document." The DOM standard is separated into 3 different parts: Core DOM - standard model for all document types
XML DOM - standard model for XML documents
HTML DOM - standard model for HTML documents

What is the HTML DOM?

The HTML DOM is a standard object model and programming interface for HTML. It defines:
The HTML elements as objects.
The properties of all HTML elements.
The methods to access all HTML elements.
The events for all HTML elements.
In other words: The HTML DOM is a standard for how to get, change, add, or delete HTML elements.