Resource Hints: preconnect

- WD

Gives a hint to the browser to begin the connection handshake (DNS, TCP, TLS) in the background to improve performance. This is indicated using <link rel="preconnect" href="https://example-domain.com/">

IE

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

Edge

  1. 12 - 14: Not supported
  2. 15 - 18: Partial support
  3. 79 - 85: Supported
  4. 86: Supported

Firefox

  1. 2 - 38: Not supported
  2. 39: Supported
  3. 40 - 70: Supported
  4. 71 - 80: Not supported
  5. 81: Not supported
  6. 82 - 83: Not supported

Chrome

  1. 4 - 45: Not supported
  2. 46 - 85: Supported
  3. 86: Supported
  4. 87 - 89: Supported

Safari

  1. 3.1 - 11: Not supported
  2. 11.1 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9 - 32: Not supported
  2. 33 - 70: Supported
  3. 71: Supported

iOS Safari

  1. 3.2 - 11.2: Not supported
  2. 11.3 - 13.7: Supported
  3. 14: Supported

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: Supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Support unknown

IE Mobile

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

UC Browser for Android

  1. 12.12: Support unknown

Samsung Internet

  1. 4: Not supported
  2. 5 - 11.2: Supported
  3. 12.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported
Resources:
Eliminating Roundtrips with Preconnect