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.

Chrome

  1. 4 - 65: Not supported
  2. 66 - 125: Supported
  3. 126: Supported
  4. 127 - 129: Supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 125: Supported
  3. 126: Supported

Safari

  1. 3.1 - 16.6: Not supported
  2. 17.0 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - TP: Supported

Firefox

  1. 2 - 114: Not supported
  2. 115 - 127: Supported
  3. 128: Supported
  4. 129 - 131: Supported

Opera

  1. 9 - 52: Not supported
  2. 53 - 110: Supported
  3. 111: Supported

IE

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

Chrome for Android

  1. 126: Supported

Safari on iOS

  1. 3.2 - 16.7: Not supported
  2. 17.0 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - 18.0: Supported

Samsung Internet

  1. 4 - 8.2: Not supported
  2. 9.2 - 24: Supported
  3. 25: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 126: Supported

Firefox for Android

  1. 127: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: 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