Strict Transport Security

- OTHER

Declare that a website is only accessible over a secure connection (HTTPS).

IE

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

Edge

  1. 12 - 79: Supported
  2. 80: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 73: Supported
  3. 74: Supported
  4. 75 - 76: Supported

Chrome

  1. 4 - 79: Supported
  2. 80: Supported
  3. 81 - 83: Supported

Safari

  1. 3.1 - 6.1: Not supported
  2. 7 - 12.1: Supported
  3. 13: Supported
  4. 13.1 - TP: Supported

Opera

  1. 9 - 11.6: Not supported
  2. 12 - 65: Supported
  3. 66: Supported

iOS Safari

  1. 3.2 - 6.1: Not supported
  2. 7 - 13.2: Supported
  3. 13.3: Supported
  4. 13.4: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 80: Supported

Blackberry Browser

  1. 7: Supported
  2. 10: Supported

Opera Mobile

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

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

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

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 10.1: Supported
  2. 11.1: Supported

QQ Browser

  1. 1.2: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

The HTTP header is 'Strict-Transport-Security'.

Resources:
MDN Web Docs - Strict Transport Security
Chromium article
OWASP article