onbeforeprint HTML Attribute

The "onbeforeprint" attribute in HTML is an event attribute which can be added to an element, that when triggered, runs a script before the user starts printing the content of the current page. The attribute value is a string containing the JavaScript code that should be executed when the event is fired.

For example, in the following code snippet, the onbeforeprint attribute is used to alert the user before they start printing the content of the current page:


<body onbeforeprint="alert('Content is about to be printed!')">

The onbeforeprint attribute can be used on the body element or on any other HTML element you want to run the script before it's being printed, it's useful to display a warning message, or to make some adjustments to the content before it gets printed.

It's worth noting that the onbeforeprint attribute is supported by some modern browsers, but not all, so it's important to check the browser compatibility before using it in your website.

In summary, the "onbeforeprint" attribute in HTML is an event attribute which can be added to an element, that when triggered, runs a script before the user starts printing the content of the current page. It's useful to display a warning message, or to make some adjustments to the content before it gets printed. It's supported by some modern browsers but not all, so it's important to check the browser compatibility before using it in your website.