While the World Wide Web Consortium maintains up-to-date central versions of some of the most important Web standards in the form of recommendations, in practice no software developer has designed a browser which adheres exactly to these standards; implementation of other standards and protocols, such as SVG and XMLHttpRequest, varies as well.
Dok World Wide Web Consortium održava ažurne središnje inačice nekih od najvažnijih mrežnih standarda u obliku preporuka,u stvarnosti nijedan razvijatelj softvera nije dizajnirao preglednik koji točno prianja tim standardima; primjena ostalih standarda i protokola, poput SVG-a i XMLHttpRequest-a, također varira.