Can I use
?

Lazy loading via attribute for images & iframes

- LS

The loading attribute on images & iframes gives authors control over when the browser should start loading the resource.

Chrome

  1. 4 - 74: Not supported
  2. 75 - 76: Disabled by default
  3. 77 - 112: Supported
  4. 113: Supported
  5. 114 - 116: Supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 112: Supported
  3. 113: Supported

Safari

  1. 3.1 - 13: Not supported
  2. 13.1 - 15.3: Disabled by default
  3. 15.4 - 16.3: Disabled by default
  4. 16.4: Supported
  5. 16.5: Supported
  6. 16.6 - TP: Supported

Firefox

  1. 2 - 74: Not supported
  2. 75 - 112: Partial support
  3. 113: Partial support
  4. 114 - 115: Partial support

Opera

  1. 9 - 60: Not supported
  2. 62 - 63: Disabled by default
  3. 64 - 98: Supported
  4. 99: Supported

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Chrome for Android

  1. 113: Supported

Safari on iOS

  1. 3.2 - 13.3: Not supported
  2. 13.4 - 15.3: Disabled by default
  3. 15.4 - 16.3: Disabled by default
  4. 16.4: Supported
  5. 16.5: Supported

Samsung Internet

  1. 4 - 11.2: Not supported
  2. 12.0 - 20: Supported
  3. 21: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 73: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 113: Supported

Firefox for Android

  1. 113: Partial support

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Partial support
Resources:
Blog post
Firefox support bug for lazy loading iframes
Polyfill
Explainer
WebKit support bug