Opera doesn't give height/width of display: none elements with getComputedStyle but does with currentStyle - fall back to that if it exists.

Make sure that accessing computed CSS for elements returns 'auto' instead of '' consistently. Fixes #7337.

For .show() with no arguments, only set display of elements in the second loop if they don't have style.display already set or if style.display isn't none. Fixes #7315.

Allow DELETE requests to have a content body, and properly serialize data to the url for HEAD requests. Fixes #7285.

Moved jQuery.props to attributes since it was only used in support. Fixes #6897 - suggestion by dmethvin

Make sure that .width()/.height() don't return NaN also standardize on returning  instead of auto for default values (which is what we do elsewhere in .css() as well). Fixes #7225.

Make sure that +, >, ~ leading, rooted, selectors go to the old engine. Thanks to @rkatic for the catch! Fixes #7220.

Forces lower case comparison of protocol and host when determining whether the request is remote or local. Fixes #6908

Followup to commit 97dfa0d5 which
had the side effect to break some attribute unit tests

Add some more tests to make sure that pulling in data- properties on an element with no data set, works.

Make sure that .data() (no args) returns a list of all the data- properties as well. Also make sure that accessing a data- property via .data() doesn't cause it to change again at a later time (it should be static). Fixes #7222, #7223.