Resource Hints: preconnect
- WDGives 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
- 4 - 45: Not supported
- 46 - 108: Supported
- 109: Supported
- 110 - 112: Supported
Edge
- 12 - 14: Not supported
- 15 - 18: Partial support
- 79 - 108: Supported
- 109: Supported
Safari
- 3.1 - 11: Not supported
- 11.1 - 16.2: Supported
- 16.3: Supported
- TP: Supported
Firefox
- 2 - 38: Not supported
- 39: Supported
- 40 - 70: Supported
- 71 - 108: Not supported
- 109: Not supported
- 110 - 111: Not supported
Opera
- 9 - 32: Not supported
- 33 - 91: Supported
- 92: Supported
IE
- 5.5 - 10: Not supported
- 11: Not supported
Chrome for Android
- 109: Supported
Safari on iOS
- 3.2 - 11.2: Not supported
- 11.3 - 16.2: Supported
- 16.3: Supported
Samsung Internet
- 4: Not supported
- 5 - 18.0: Supported
- 19.0: Supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 72: Supported
UC Browser for Android
- 13.4: Supported
Android Browser
- 2.1 - 4.4.4: Not supported
- 109: Supported
Firefox for Android
- 107: Support unknown
QQ Browser
- 13.1: Supported
Baidu Browser
- 13.18: Supported
KaiOS Browser
- 2.5: Supported
- Resources:
- Eliminating Roundtrips with Preconnect