window.dispatchEvent(new Event('resize'));
const heightOutput = document.querySelector('#height'); const widthOutput = document.querySelector('#width'); function reportWindowSize() { heightOutput.textContent = window.innerHeight; widthOutput.textContent = window.innerWidth; } window.onresize = reportWindowSize;
<p>Resize the browser window to fire the <code>resize</code> event.</p> <p>Window height: <span id="height"></span></p> <p>Window width: <span id="width"></span></p>