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(upbeat music) - [Narrator] Even a fully optimized image can slow down the performance of your site, if itamp;#39;s delivered to the wrong browser at the wrong time. This is the problem, responsive images markup is meant to solve. Hereamp;#39;s a quick intro to responsive images. Using a standard image element, the same image file is delivered to all browsers regardless of how big the displayed image is. That means if you want to deliver a full bleed 1,920 pixel wide image to full width desktop browsers, that same 1,920 pixel wide image will also be delivered to a 320 pixel wide feature phone, which is not great for performance on that phone. To solve this issue, we have two responsive images attributes. Srcset and sizes. Srcset allows you to provide a literal set or list of image sources for the browser to choose from. So in addition to providing the default source attribute you also provide a srcset attribute, holding a list of different sized image files. For each of these files,