Ever since responsive web design started, we've had a problem with the way images load on the web. Now, Firefox is fixing the problem. Add width & height attributes to all your images, and see load jankiness disappear. Jen Simmons explains how. Try out the demos for yourself: Fixed-width layout: https://codepen.io/jensimmons/pen/jOONZaZ?editors=1100 Responsive layout: https://codepen.io/jensimmo
![Do This to Improve Image Loading on Your Website](https://cdn-ak-scissors.b.st-hatena.com/image/square/b6e5425b20dd726391c8343b593d03c79dd71095/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2F4-d_SoCHeWE%2Fhqdefault.jpg)