HTML Element Targeting - JsPlayground 2022

In order to target any html element via TypeScript, you need to cast it like so:
var MessageLabel = <HTMLElement>document.getElementById("message");


window.onload = function ()
{
    var greeting: string = "Hello World";

    var MessageLabel = <HTMLElement>document.getElementById("message");
    MessageLabel.innerHTML = greeting;

    var TextBox1 = <HTMLInputElement>document.getElementById("TextBox1");
    TextBox1.value = greeting;
};