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Web pages are made up of multiple objects. This first object fetched is an HTML document, which tells your browser which additional objects it should load and how to display them. Additional objects could include scripts, style sheets, and images.

For complex pages, these objects are often served from different servers. For example, a site might host all of its HTML and JavaScript on one server and its images on another. Sometimes, sites serve pages differently over HTTP and HTTP/2 (e.g., serving CSS in a separate file in HTTP/2 that was previously inlined directly in the HTML):

These results compare the HTTP and HTTP/2 versions of the sites we crawled in terms of: