Semicolon as URL query separator

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The W3C Recommendation from 1999 is obsolete. The current status, according to the 2014 W3C Recommendation, is that semicolon is now illegal as a parameter separator:

To decode application/x-www-form-urlencoded payloads, the following algorithm should be used. […] The output of this algorithm is a sorted list of name-value pairs. […]

  1. Let strings be the result of strictly splitting the string payload on U+0026 AMPERSAND characters (&).

In other words, ?foo=bar;baz means the parameter foo will have the value bar;baz; whereas ?foo=bar;baz=sna should result in foo being bar;baz=sna (although technically illegal since the second = should be escaped to %3D).

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