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
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