Living Standard — Last Updated 18 September 2015 Participate: GitHub whatwg/url ( new issue , open issues , legacy open bugs ) IRC: #whatwg on Freenode Commits: https://github.com/whatwg/url/commits @urlstandard Abstract The URL Standard defines URLs, domains, IP addresses, the application/x-www-form-urlencoded format, and their API. Table of Contents Goals 1 Infrastructure 1.1 Parsers 1.2 Percent-encoded bytes 2 Security considerations 3 Hosts (domains and IP addresses) 3.1 IDNA 3.2 Host syntax 3.3 Host parsing 3.4 Host serializing 3.5 Host equivalence 4 URLs 4.1 URL syntax 4.2 URL parsing 4.3 URL serializing 4.4 URL equivalence 4.5 Origin 4.6 URL rendering 5 application/x-www-form-urlencoded 5.1 application/x-www-form-urlencoded parsing 5.2 application/x-www-form-urlencoded serializing 5.3 Hooks 6 API 6....