The HTML id attribute is used to specify a unique id for an HTML element. You cannot have more than one element with the same id in an HTML document.

Jul 11, 2025 · HTML id attribute provides a unique identifier for an element within a document. It allows targeted selection and manipulation of the element through CSS and JavaScript, facilitating specific …

The id attribute specifies a unique id for an HTML element (the value must be unique within the HTML document). The id value can be used by CSS and JavaScript to perform certain tasks for the element …

Nov 6, 2025 · Browsers treat non-conforming IDs that contain whitespace as if the whitespace is part of the ID. In contrast to the class attribute, which allows space-separated values, elements can only …

An HTML id is an attribute that can be added to an HTML element to give it a unique identifier. It is used in CSS or JavaScript to select and style the element, or to add behavior to it with JavaScript.

This tutorial is all about the HTML id attribute. Learn what it is, its syntax, the difference between HTML class and id, how to use id in JavaScript, and more.

Oct 23, 2025 · The id attribute in HTML is used to assign a unique identifier to an element on a webpage. Each id value must be unique meaning it can only be used once in a document. You can …

The id attribute gives an HTML element a unique identifier. No two elements on the same page should share the same id. This uniqueness ensures that styles or scripts affect only the intended...

In CSS, you must write a hash ( # ) character followed by the id of the element for selecting the element with a specified id. It must have at least one character, and must not contain whitespace (tabs, …

Feb 22, 2025 · The ‘ id ‘ attribute in HTML is an unique identifier used to uniquely identify any element within a page. In simple words, we use id attribute to specify a unique id for an HTML element.