Once the full image loads, the onLoad handler will trigger a state change and have an animated cross fade between the blurred placeholder image and the real hi-res image. The width property isn’t taken into account because the image at 100 width still isn’t over 500px. The user's browser will then choose the optimal image and download that one instead of the src. In this instance, col-lg-5 sets your image width to 41 of the parent and here you’re setting the max width to 100 of it’s parent, which is set to 41 of it’s parent. This will load right away and take up minimal space on the initial download (the sample project placeholder is 1.5K gzipped). The code below has one img using the placeholder image, which is inlined as a datauri. See facebook's write up for further details. This delivers a fully rendered experience to the user as quick as possible without empty boxes or jumpy reflow/layouts. Placeholder images are tiny images that are inlined and blurred until the hi-res image is loaded. ![]() Optionally you make also create a placeholder image. Var responsive = require ( 'resize-image?sizes=200w,sizes=900w!./myImage.jpg' ) var img = require ( './myImage.jpg' ). This loader need to be set in the javascript source, not the webpack config file. The loader creates the various sized images and return the proper formated result for the property (including any file name changes for long term caching). Use the sizes param of the resize-image-loader to set all the desired widths. image sizeĩ00 px width image (resized & optimized srcset) Below is the render times with the full image vs a responsive one and a placeholder image. Sample MetricsĬheck out the test folder for a sample use case. This will greatly improve page load times and time to first render while reducing the cost for the user 2. Older browsers will default back to the normal src image. If srcset is supported the browser will use the device's screensize and pixel density to determine the best image to download. Modern browser have an additional attibute on the img tag called srcset. Resize-image-loader will create responsive images using webpack and gm so only the most effecient image is downloaded for the user's device. Hyper optimize your images to have massive improvement page load times. Hope this helps anyone looking to improve and optimise the way they implement responsive images in Drupal.Images account for 58% 1 of web pages. Some next steps could be adding a formatters for the modules and figuring out support for retina images (even though these would increase the image sizes). Using a different aspect ratio for smaller/larger screens can still be used based on the requirements, although that would make the setup a bit more complex and would require more view modes for your media. The example uses the same aspect ratio for all defined widths, but technically that is not a requirement. The media template for our “16_9" view mode ( media - image - ) now looked like this, using the “image_style“ filter of the Twig Tweak module to load the actual image URLs for image styles from the file: So we now got image styles for a 4:3 ratio and 16:9 ratio like:įor images maintaining their original ratio we just use the width, like 50w, 150w, etc. The media template could provide all the image styles with different widths for that image style, and use the “srcset” attribute to let the browser pick the best image. Since we were using media to add images to content, we experimented with having media view modes defined by aspect ratio, combined with a bunch of different image styles for the images in that specific aspect ratio. Also notice the HTML5 “loading” attribute to enable lazy loading of images for even more optimization. The default “src” contains a really small version of the image by default for better performance. ![]() ![]() In HTML5 we can define a “srcset” attribute, which loads the correct image based on the browsers viewport. Since the images are defined for fixed breakpoints, this leads to a lot of the images being loaded for the user are still too big.Īfter struggling with this, we thought about how we could find a way to improve this. Most of the sites I have built lately also have a fluid design. This takes quite some work and planning to set everything up, and maintaining all the image styles if changes need to be made is always a pain. In Drupal you can create your breakpoints in your theme or module and use the Responsive Image module to set up different responsive image styles, defining which image style to use for a specific breakpoint. Responsive images have always been a pain to configure properly. Responsive Image Optimization With Media in Drupal 9
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