Function preconnect

docs/index.js:17106–17109

(href, crossOrigin)

  preconnectAs("dns-prefetch", href, null);
}
function preconnect(href, crossOrigin) {
  previousDispatcher.C(href, crossOrigin);
  preconnectAs("preconnect", href, crossOrigin);
}
function preload(href, as, options) {
  previousDispatcher.L(href, as, options);
  var ownerDocument = globalDocument;