The target parameter determines which window or tab to load the resource into, and the windowFeatures parameter can be used to control to open a new popup with minimal UI features and control its size and position. To quickly begin app development, I use the "Create React . onload Event - W3Schools UI interactions are ineffective ( window.open, alert, confirm, etc.) In the next example I will show you how to change the code to use TypeScript's Arrow Function. Inside document.addEventListener( "DOMContentLoaded", function(){}); will run it once the DOM is ready. Example1 In this example, there is a div element with a height of 200px and a width of 200px. Content available under a Creative Commons license. In general you should do the second, but you should attach an event listener to it instead of defining the function. What is the correct way to screw wall and ceiling drywalls? Images and other resources may also still continue loading. In the next step function code() is declared inside of the