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URL schemes
The contents of this page, URL schemes, and all edits made to this page in its history, are hereby released under the CC0 Public Domain Dedication, as described in WHATWG Wiki:Copyrights.
about: URLs
about: URLs serve as identifier, potentially with an associated resource. The identifier is given in the URL's scheme data.
| Identifier | Resource | Notes |
|---|---|---|
| "blank" | A resource whose Content-Type is text/html;charset=utf-8 and entity body is the empty string. | |
| "invalid" | - | Used by CSS's url() function as a default value |
| "html-kind" | - | Used as an identifier for kinds of media tracks for HTML <audio> and <video> elements. |
| "legacy-compat" | - | Used in HTML for XSLT serializers. |
| "srcdoc" | - | Used in HTML for its <iframe srcdoc> feature. |
about: URLs are handled as part of the Fetch Standard; all but about:blank cause a network error. Cases like about:config can also make it to the fallback paths of HTML's navigate algorithm.
See also The "about" URI Scheme and "about" URI Tokens which this wiki page obsoletes.
Examples
| Input | Result |
|---|---|
| about:blanK | network error (uppercase K) |
| about:bl%61nk | network error (no percent decoding by either the URL parser or the obtain a resource algorithm) |
| about:blank?teehee | works (query does not matter) |
| about:blank?teehee#hihi | works (fragment does not matter either) |
data: URLs
javascript: URLs
javascript: URLs represent a JavaScript script. They are handled by the HTML Standard's navigate algorithm.
See also The 'javascript' resource identifier scheme which the HTML Standard obsoletes.
Others
- ws: & wss:
- See Wikipedia
- See IANA