The rel="preconnect" attribute for the <link> HTML element is a hint to the browser that the page or user is likely to request resources from another origin, so the browser should preemptively start a connection to the href value's origin.

Learning resources on MDN

• rel=preconnect

Browser support

• Chrome 46 Released on 2015-10-13
• Chrome Android 46 Released on 2015-10-14
• Edge 79 Released on 2020-01-15
• Firefox 39 Released on 2015-07-02
• Firefox for Android 39 Released on 2015-07-02
• Safari 11.1 Released on 2018-04-12
• Safari on iOS 11.3 Released on 2018-03-29

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