HTML5 id

id

• 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.

• The id attribute specifies a unique id for an HTML element. 

• The value of the id attribute must be unique within the HTML document.

• The id attribute is used to point to a specific style declaration in a style sheet. It is also used by JavaScript to access and manipulate the element with the specific id.

Example

<h1 id="heading">Header</h1>

<style>

#heading {

    color: blue;

}

</style>