How to detect if webp images are supported via CSS

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How do you detect in CSS if webp images are supported?

.home-banner-background {
     background-image: url('img/banner.jpg');
 }
 /*Here is an if statement that will check if webp is supported*/ {
        .home-banner-background {
            background-image: url('img/banner.webp');
        }
}

Is there an "if" statement which can do that?

You can use Modernizr. It is a tool that detect available features on the user's browser. It is just a script to add in your website, and with it, you can write something like that :

.no-webp .home-banner-background {
     background-image: url('img/banner.jpg');
 }

.webp .home-banner-background {
     background-image: url('img/banner.webp');
}

Using WebP Images, When you save images using the WebP Lossless format with the which allows you to detect WebP support with very low overhead. When you� If you already use WebP images for your HTML tags and want to enable WebP for the CSS background as well, the proper way is to use multiple backgrounds is the CSS styling. For example, you have an element with .png CSS background: .minicart-wrapper .action.showcart.desktop .f

This is currently not supported with CSS.

In the CSS Images Module Level 4 Draft, a fallback solution is suggested, but this is currently not supported anywhere. (2.4. Image Fallbacks and Annotations: the image() notation)

But if it will become part of a standard in some years, you then might be able to write:

.home-banner-background {
    image:image('img/banner.webp', 'img/banner.jpg')
}

Until then you need to use tools like Modernizer, as suggested in the answer of Fifi

Alternatively, the picture HTML tag might something you could think of, but if that is usable in your case depends on how the image should resize on your site:

<picture>
  <source srcset="img/banner.webp" type="image/webp">
  <source srcset="img/banner.jpg" type="image/jpeg"> 
  <img src="img/banner.jpg">
</picture>


How to Detect Browser Support WebP | by JackPu, indexOf('data:image/webp') == 0; } // very old browser like IE 8, canvas not supported return false; }. If you try webp in CSS, you need to use a� The logic to verify if the webp format is supported with Plain JavaScript is the following: the first you need is a base64 string with some image in webp format, in this case we'll use a white image of 1px that is already in this format, then this string needs to be converted into a Blob.

The modern webkit browser will use the WebP background image with this CSS:

.map {background-image: url('../img/map.jpg');}
  @supports (background-image: -webkit-image-set(url('../img/map.webp') 1x)) {
    .map {background-image: -webkit-image-set(url('../img/map.webp') 1x) }
  }

How to make your website load lightning fast with WebP images, When I ran my JPG image through the WebP converter, I got the following results: your image in the normal HTML way (rather than inside a CSS class, we're first checking to see if the browser supports the <pictu re> tag. WebP images with htaccess. Place the following in your .htaccess file and jpg/png images will be replaced with WebP images if found in the same folder. <IfModule mod_rewrite.c> RewriteEngine On # Check if browser support WebP images RewriteCond %{HTTP_ACCEPT} image/webp # Check if WebP replacement image exists RewriteCond %{DOCUMENT_ROOT}/$1.webp -f # Serve WebP image instead RewriteRule

You could actually just add it to the original declaration without needing multiple classes, @supports, or bringing in another library like so:

.home-banner-background {
    background-image: url('img/banner.jpg';
    background-image: -webkit-image-set(url('img/banner.wepb') 1x,
                                        url('img/banner-2x.webp') 2x),
                                        /* etc */;
}

Webkit will use the webp images and all others will fallback to the regular image.

Detect WEBP Support with JavaScript, async function supportsWebp() { if (!self.createImageBitmap) return false; const webpData = 'data:image� There are ways to detect WebP images using Javascript and server-side techniques (htaccess for example), but the most robust solution is to use <picture> tag for your images in the webpage. The <picture> tag has been created for these special cases, so it is best to use this to provide the best browser support.

How to check if WebP image is displayed on your site, NoteUsing this way to display WebP images will not apply changes to images added by CSS (background images). Using rewrite rules method. Using rewrite rules� Since GIPHY lazy loads its images, GIPHY has the opportunity to use WEBP feature detection with JavaScript. Googler and Service Worker pioneer Jake Archibald recently tweeted a snippet showing how you can use a service worker to detect WEBP support:

The WebP Lossy Configuration Dialogue. The settings dialogue for lossy WebP gives more flexibility for configuring the output. You can adjust the image quality by using a slider from 0 to 100 (similar to JPEG), set the strength of the filtering profile to get lower file sizes (at the expense of visual quality, of course) and adjust noise filtering and sharpness.

If you want to use your WebP images as CSS background images, it’s going to take an extra step. In this lesson, you will learn how to use Modernizr.js to detect your browser’s supported features and provide fallbacks for your CSS WebP images. Useful Links. Modernizr.js

Comments
  • Pretty sure that is impossible to "detect" using CSS alone.
  • There are no if statments in css. If something is not supported it simply ignores that rule. A missing image or not supported image will not be ignored since the css is valid.
  • Only "if statements in CSS" can test property support only -- @supports (property: value){/*rules*/} -- not image file format support. It would be nice to be able to do @supports (background-image: url('existing-image.webp')){/*...*/} but for quite obvious reasons this doesn't work.
  • Safari also supports -webkit-image-set but not webp. This will fail on iOS
  • Ah, good call. In some situations recently, I've been checking for user agent, and using the appropriate image format based on that. Can't wait till there's a better way.
  • Checking the "Accept" header for "image/webp" is much better than guessing based on the user agent