Responsive design is about building a website with a grid-based layout, images that resize and media queries, as described by Ethan Marcotte. After Marcotte defined the technique, responsive design frameworks began to emerge that incorporated these principles. Mostly based on CSS and JavaScript, many of these frameworks are open-source, free to download and quickly customizable. Some of the most popular today are Bootstrap and Foundation , which we’ll focus on in this article. As responsive design frameworks became popular, a big debate emerged : Why would a professional designer use a responsive design framework? Internet debates rage on . Many declare that responsive design frameworks are awful, that only people who don’t know HTML and CSS would ever use such a thing
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