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/">

Chrome

  1. 4 - 45: Not supported
  2. 46 - 124: Supported
  3. 125: Supported
  4. 126 - 128: Supported

Edge

  1. 12 - 14: Not supported
  2. 15 - 18: Partial support
  3. 79 - 123: Supported
  4. 124: Supported

Safari

  1. 3.1 - 11: Not supported
  2. 11.1 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - TP: Supported

Firefox

  1. 2 - 38: Not supported
  2. 39: Supported
  3. 40 - 70: Supported
  4. 71 - 114: Not supported
  5. 115 - 125: Supported
  6. 126: Supported
  7. 127 - 129: Supported

Opera

  1. 9 - 32: Not supported
  2. 33 - 108: Supported
  3. 109: Supported

IE

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

Chrome for Android

  1. 124: Supported

Safari on iOS

  1. 3.2 - 11.2: Not supported
  2. 11.3 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6: Supported

Samsung Internet

  1. 4: Not supported
  2. 5 - 23: Supported
  3. 24: 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. 124: Supported

Firefox for Android

  1. 125: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
Eliminating Roundtrips with Preconnect