is() function not handling expressions properly

[tremby]

$("body").is("div span") is returning true

it should always return false, since a body element is /not/ a span element which is a descendant of a div element.

is() seems to return true if there are any two things separated by space, for instance $(whatever).is(".bigclass .otherclass")

[flesler]

is() doesn't support complex selectors (those including spaces, >, etc). We might add this for 1.3.

[tremby]

can you at least mention that in the documentation? it only says it supports "expressions", which anyone would logically assume means anything on the "selectors" page of the docs.

[flesler]

From ​http://docs.jquery.com/Traversing/is.

'''Note:''' Only simple expressions are supported. Complex expressions, such as those containing hierarchy selectors (such as +, ~, and >) will always return 'true'.