This website can switch between dark and light mode by clicking this switch button on the top right corner: This switch affects the background and font color of the page, but it can also create cool effects with graphics that respond to it, like below. This common feature across many websites is a rich “slice” of web development, showcasing the whole toolkit: HTML, XML-based graphics (SVG), CSS, and JavaScript. Stay tuned for the next blog post, where we’ll create this feature from scratch, as well as graphics responsive to it.