Resource Hints: modulepreload

- LS

Using <link rel="modulepreload">, browsers can be informed to prefetch module scripts without having to execute them, allowing fine-grained control over when and how module resources are loaded.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79: Supported
  3. 80: Supported

Firefox

  1. 2 - 73: Not supported
  2. 74: Not supported
  3. 75 - 76: Not supported

Chrome

  1. 4 - 65: Not supported
  2. 66 - 79: Supported
  3. 80: Supported
  4. 81 - 83: Supported

Safari

  1. 3.1 - 12.1: Not supported
  2. 13: Not supported
  3. 13.1 - TP: Not supported

Opera

  1. 9 - 52: Not supported
  2. 53 - 65: Supported
  3. 66: Supported

iOS Safari

  1. 3.2 - 13.2: Not supported
  2. 13.3: Not supported
  3. 13.4: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 80: Supported

Blackberry Browser

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

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Supported

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Not supported

IE Mobile

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

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 8.2: Not supported
  2. 9.2 - 10.1: Supported
  3. 11.1: Supported

QQ Browser

  1. 1.2: Support unknown

Baidu Browser

  1. 7.12: Support unknown

KaiOS Browser

  1. 2.5: Not supported

Unlike some other link relations, changing the relevant attributes (such as as, crossorigin, and referrerpolicy) of such a link does not trigger a new fetch. This is because the document's module map has already been populated by a previous fetch, and so re-fetching would be pointless.

Resources:
WebKit implementation bug
Gecko implementation bug
Preloading modules
Modern Script Loading