When you open a web-page, the browser requests the HTML document from a server, parses its
contents, and submits separate requests for any referenced resources. JCH
HTTP/2 Push feature to preload key requests to make your
pages load faster.
The component does this using the
Link HTTP Header:
Link: </css/style.css>; rel="preload"; as="style"
A benefit of specifying
preload in the HTTP Header rather than the
<link rel="preload"> is that the browser doesn't need to parse the document
to discover iit, which can offer small improvements in some cases.
will preload font files and images that are used above the folds, CSS files when the
Optimize CSS Delivery