* contains returns a boolean for if substr is found within str.

* Support testing using an element * @param {Function} fn Passed the created div and expects a boolean result

* Mark a function for special use by Sizzle * @param {Function} fn The function to mark

Utility function for quoting an Object's key value iff required * @private

* is returns a boolean for if typeof obj is exactly type.

* @method private * @name position * @description Handles updating instance position * @param data [object] "Instance data" * @param index [in

* Returns a function to use in pseudos for positionals * @param {Function} fn