The beforeprint event is fired when the associated document is about to be printed or previewed for printing.

The addEventListener(), or set an event handler property.

addEventListener("beforeprint", (event) => {});
onbeforeprint = (event) => {};

window.addEventListener("beforeprint", (event) => {
  console.log("Before print");
});

window.onbeforeprint = (event) => {
  console.log("Before print");
};

Specifications

Browser compatibility

BCD tables only load in the browser