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To register for the beforeunload event, you use the window.addEventListener () method: window .addEventListener ( 'beforeunload' , (event) => { // do something here }); Code language: JavaScript (javascript) Since the window is the global object, you can omit it like this: addEventListener ( 'beforeunload' , (event) => { // do something here }); When extreme changes in context are explicitly identified before they occur, then the users can determine if they wish to proceed or so they can be prepared for the change: not only they will not be confused or feel disoriented, but more experienced users can better decide how to open such links (in a new window or not, in the same window, in a new tab or not, in "background" or not). Inside window.onload function(){}) will run as soon as all page resources are loaded. Give the name of your application as "Window_Navigator" and then click ok. Here is a quick fix for you You will also find that the general Event type doesn't have width and height, so you may need to specialise the type for that too. Using "_blank" as the target attribute value will create several new and unnamed windows on the user's desktop that cannot be recycled or reused.
Page Load Time in TypeScript - c-sharpcorner.com Let's say, however, you were targeting a div that was in your markup after your script, you would get an error if you don't wait until that piece of the DOM tree to load. In the next step function code() is declared inside of the