<h1>Writing into an alert box, using window.alert().</h1>
<h1>Writing into the HTML output using document.write().</h1>
<h1>Writing into an HTML element, using innerHTML.</h1>
<h1>Writing into the browser console, using console.log().</h1>
<h1 >5+6=
<a class="innerHTML" id="changeInnerHTML" href="#">?</a></h1>
<button class="alertBtn">Alert</button>
<button class="writeBTN">Document Write</button>
<button class="consoleLog">Console Log</button>