Use documentElement in focus selector for IE's sake. Fixes jQuery #13378.
Revert "Use documentElement in focus selector for IE's sake. Fixes jQuery #13378."

This reverts commit 578e0c6f403e5819eb7cff953990229c5593e0cf.
jshintrc: predef -> globals
Allow :focus selector to pass through QSA. Breaks Chrome 21, bypasses IE8/9 throwing an error. Supplements jQuery #13378.
Conform to new style guide for jshintrc's. Close gh-201.
No ticket: Allow class selectors for SVG elements. Close gh-202.
Use node retrieval and 'specified' property check for src attributes. Fixes jQuery #13777.

- Updated jQuery