![]() ![]() ![]() The browser sends a request to your server for the image it wants to download.The browser parses the code and decides which image is the best match.The browser sends an HTTP request to your server to download the HTML document.The user enters your URL into their browser's address bar.You add the responsive image syntax to your HTML, CSS, or (sometimes) JavaScript file(s).You upload all the images to your server. ![]() The selection process roughly happens as follows: MIME types)įor instance, the following code example lists three alternative image sources which are different in file format so that the browser of each user can choose the best match: the viewport's width, height, aspect ratio, etc.They can identify the best-fitting image from a list of available image options and selection criteria such as: A website can respond to device properties and technical capabilities by displaying slightly different content.īrowsers include features to make it easier to implement responsive images. Responsive images are one aspect of responsive web design. It's like a competition of images - you provide a set of images for one image spot on a web page, and the browser of each user picks and downloads the one that best fits its needs. Responsive images are a collection of image files a user agent (e.g. The term 'responsive images' is somewhat misleading, as an image can't be responsive on its own. Since images are a key aspect of web performance, in this article, we'll look into responsive images in detail, including their pros and cons, a handful of code examples, a couple of recommendations, and a bit of theory related to the subject. 'Responsive images' is an umbrella term for a number of image optimization techniques that allow web designers and frontend developers to reduce page weight, improve site speed, and enhance user experience.Īs image weight impacts your Largest Contentful Paint score, one of Google's Core Web Vitals metrics included in its search algorithm, you can also improve your SEO rankings by using responsive images. ![]()
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