HTML Id

In HTML, an ID is an attribute that is used to uniquely identify an element on a web page. The ID attribute can be used to assign a unique identifier to an HTML element, which can be used for a variety of purposes such as linking to a specific section of a page, applying specific styles to an element using CSS, or referencing an element in JavaScript.

To define an ID for an HTML element, you use the "id" attribute in the opening tag of the element, followed by a unique identifier. The syntax for defining an ID is as follows:

<tagname id="idname">

Where tagname is the HTML tag of the element and idname is the unique identifier you want to assign.

For example, if you wanted to give a specific div element an ID of "mydiv", you would use the following code:

<div id="mydiv">
    <!-- content goes here -->
</div>

IDs are unique within a page, meaning that no two elements should have the same ID. Using the ID attribute makes it easy to refer to specific elements within the document using JavaScript or to link to a specific section of a page using anchor links.