###History of JavaScript
HTML and CSS are markup languages. Markup languages are used to describe and define elements within a document. JavaScript is a programming language. Programming languages are used to communicate instructions to a machine. Programming languages can be used to control the behavior of a machine and to express algorithms.
console.log
console.log("Hello friend!");
for (var i = 0; i < 10; i++){
console.log(i);
}
document.getElementsByTagName("h1")[0].style.color = "#ff0000";
document.body.addEventListener('click', function () {
var myParent = document.getElementById("Banner");
var myImage = document.createElement("img");
myImage.src = 'https://thecatapi.com/api/images/get?format=src&type=gif';
myParent.appendChild(myImage);
myImage.style.marginLeft = "160px";
});