This makes sense to do as a WordPress plugin, because we’ll want to keep it active no matter what theme is active. This will ensure that your theme gives WordPress permission to resize the uploaded images. The ThemeĪll you need to do in your theme is make sure this one-liner is present in its functions.php file: add_theme_support('post-thumbnails') What we’re not going to do is use that markup directly in blog posts, we’re going to get WordPress to help us with that. That is the basic markup pattern, although it can get slightly more complex to accommodate some browser bugs. UPDATE: The element is landing in browsers, so the plugin/code in this article has been updated to work directly with that syntax. For now, we’ll use the markup that library suggests, which closely mimics what the element will soon be. We’ll be using the Picturefill library here. Here I’ll show you how to add support for responsive images to your WordPress site in the form of a small WordPress plugin. This is achieved by changing the file functions.php. Fortunately, with a few lines of PHP and some JavaScript, you can now add automatic responsive image functionality to your WordPress site. You only need to upload a particular image and WordPress will develop the resized copies. If you’re more like me, you probably skipped over a responsive image solution in favor of making things easier for whomever will be doing the updating. If you’re like me, and you’re tasked with building responsive website that’s relatively easy to update, WordPress is most often the CMS you will be building that website on. Tim will show us how we can customize and exploit that ability to help us with responsive images in content. When you upload an image, it automatically creates and saves different versions of it. The following post is guest co-authored by Tim Evko ( WordPress has a built-in media uploading system. It sounds likely that this will make it into WordPress core eventually. It’s the official WordPress plugin of the Responsive Images Community Group and is endorsed by the WordPress Core Team. Update: The plugin created in this article has moved here and now uses the more appropriate srcset attribute. ![]() So if you’re running WordPress 4.4 or newer, you automatically have this. Latest Update: The plugin has been merged into WordPress core.
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