Strict Transport Security

- OTHER

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

IE

  1. 5.5 - 10
  2. 11

Edge

  1. 12 - 81
  2. 83

Firefox

  1. 2 - 3.6
  2. 4 - 77
  3. 78
  4. 79 - 80

Chrome

  1. 4 - 81
  2. 83
  3. 84 - 86

Safari

  1. 3.1 - 6.1
  2. 7 - 13
  3. 13.1
  4. 14 - TP

Opera

  1. 9 - 11.6
  2. 12 - 68
  3. 69

iOS Safari

  1. 3.2 - 6.1
  2. 7 - 13.3
  3. 13.4
  4. 14.0

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.3
  2. 4.4 - 4.4.4
  3. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12.1
  2. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4 - 11.2
  2. 12.0

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5

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

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