Validator.nu GET Input
From WHATWG Wiki
To use Validator.nu as a Web service via GET, the client issues an HTTP request either to http://validator.nu/ or http://html5.validator.nu/ using the GET method. The IRI (http or https.) of the document to check is encoded as a query string parameter called doc. Common parameters are also encoded as query string parameters.
Only & is supported as a query parameter separator. ; is not supported.
Percent-encoded octets in the query string must decode to UTF-8.
