Can I use
?

Lazy loading via attribute for images & iframes

- LS

The loading attributing 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 - 85: Supported
  3. 86: Supported

Firefox

  1. 2 - 74: Not supported
  2. 75 - 80: Partial support
  3. 81: Partial support
  4. 82 - 83: Partial support

Chrome

  1. 4 - 74: Not supported
  2. 75 - 76: Disabled by default
  3. 77 - 85: Supported
  4. 86: Supported
  5. 87 - 89: Supported

Safari

  1. 3.1 - 13: Not supported
  2. 13.1: Disabled by default
  3. 14: Disabled by default
  4. TP: Disabled by default

Opera

  1. 9 - 60: Not supported
  2. 62 - 63: Disabled by default
  3. 64 - 70: Supported
  4. 71: Supported

iOS Safari

  1. 3.2 - 13.3: Not supported
  2. 13.4: Disabled by default
  3. 14: Disabled by default

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Not supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Partial support

IE Mobile

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

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 11.2: Not supported
  2. 12.0: 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