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.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 100: Supported
  3. 101: Supported

Firefox

  1. 2 - 74: Not supported
  2. 75 - 99: Partial support
  3. 100: Partial support
  4. 101 - 102: Partial support

Chrome

  1. 4 - 74: Not supported
  2. 75 - 76: Disabled by default
  3. 77 - 100: Supported
  4. 101: Supported
  5. 102 - 104: Supported

Safari

  1. 3.1 - 13: Not supported
  2. 13.1 - 15.3: Disabled by default
  3. 15.4: Disabled by default
  4. TP: Disabled by default

Opera

  1. 9 - 60: Not supported
  2. 62 - 63: Disabled by default
  3. 64 - 85: Supported
  4. 86: Supported
  5. 87: Supported

Safari on iOS

  1. 3.2 - 13.3: Not supported
  2. 13.4 - 15.3: Disabled by default
  3. 15.4: Disabled by default

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 101: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 64: Supported

Chrome for Android

  1. 101: Supported

Firefox for Android

  1. 100: Partial support

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 11.2: Not supported
  2. 12.0 - 15.0: Supported
  3. 16.0: Supported

QQ Browser

  1. 10.4: Not supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

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