What is the id Attribute in HTML?
The id attribute specifies a unique id for an HTML element .
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The id value can be used by CSS and JavaScript to perform certain tasks for a unique element with the specified id value.
To select an element in css with a specific id you need to write a hash (#) character followed by the id of the element.
E.g:
HTML element can only have one unique id that belongs to that single element while a class name can be used by multiple elements.
id Attribute in JavaScript
JavaScript can access an element with a specified id by using the getElementById() method.
E.g: