Lazy-loading images and iframes
Newly available since 2023-12-19
The loading="lazy" attribute for <img> and <iframe> elements blocks loading the external resource until the user scrolls to that element's part of the page.
Learning resources on MDN
Browser support (view on caniuse.com)
- Chrome 77 Released on 2019-09-10
- Chrome Android 77 Released on 2019-09-10
- Edge 79 Released on 2020-01-15
- Firefox 121 Released on 2023-12-19
- Firefox for Android 121 Released on 2023-12-19
- Safari 16.4 Released on 2023-03-27
- Safari on iOS 16.4 Released on 2023-03-27
Specifications
- HTML Standard (#lazy-loading-attributes), from HTML Workstream (WHATWG).