Link types: preconnect

The preconnect keyword for the rel attribute of the <link> element is a hint to browsers that the user is likely to need resources from the target resource's origin, and therefore the browser can likely improve the user experience by preemptively initiating a connection to that origin.

<link rel="preconnect" href="https://example.com" />

Specifications

Specification
HTML Standard
# link-type-preconnect

Browser compatibility

BCD tables only load in the browser