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The onclick attribute is an event attribute that is supported by all browsers. It appears when the user clicks on a button element. If you want to make a button onclick, you need to add the onclick The onclick event executes a certain functionality when a button is clicked. This could be when a user submits a form, when you change certain content on the web page, and other things like that. You place the JavaScript function you want to execute inside the opening tag of the button.he onclick property of an Input object specifies an event handler function that is invoked when the user clicks on the input element. It is not invoked when the click( ) method is called for the element. Only form elements that are buttons invoke the onclick event