Select the ones you created in the previous step, and set the smallest one as your fallback image style in case your user is on an extremely old browser and the polyfill fails. (If you're not seeing the breakpoint group you created in your YML file, try clearing caches.) Once selected, this should let you choose an image style for each breakpoint in the group. Give your style a name, and choose your breakpoint group from the available dropdown. Once that's done, go to /admin/config/media/responsive-image-style and click "Add responsive image style." These are standard Drupal image styles as found in both Drupal 7 and 8 at /admin/config/media/image-styles. I've chosen to create "Banner Image Small" for screens under 600px wide, and "Banner Image Large" for screens 600px or over. Now it's time to create our image styles - one for each breakpoint. For a deeper dive into breakpoint options, including different media queries and resolution multipliers, check out the Breakpoint documentation on. You can create multiple groupings as needed for different image styles across your site. In this case, bannerImage is a grouping of breakpoints that I'm going to use in the same responsive image style. Set your breakpoints like so, making sure to order the weights from smallest to largest: Back when Breakpoint was a Drupal 7 contrib module, you could set your breakpoints in the admin interface, but now it needs to be done in code. Next, you'll need to create a file named your_theme_ (or your_module_). For this example, I'm using 600px, but you should generally use the same breakpoint(s) that you use in your theme's media queries. As of Drupal 8, these are in core! Figure out at which breakpoint(s) you want to swap your images sizes. Luckily, Drupal 8 makes it easier than ever to load the appropriate image size for the user's viewport.įirst, ensure that the "Breakpoint" and "Responsive Image" modules are enabled on your site. While a CSS rule of max-width: 100% will do the trick visually, it won't prevent that 2000px banner image from trying (and failing) to load over somebody's spotty 3G connection. On responsive websites, it's important to optimize images for a variety of screen sizes.
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