I think, we need a clear defintion of the 'context'.

The second argument to the $() function.

I think we are pretty close.

But I found this in the init :

 // Handle $(DOMElement)
  if (selector.nodeType) {
        this.context = this[0] = selector;
        this.length = 1;
        return this;
  }

Which confused me? I thought that context is the parent element, inside which selector is applied ? Like this:

jQuery( context ).find( selector ) ; 

According to this , the above part of init() should be changed to this:

 // Handle $(DOMElement)
       if (selector.nodeType) {
           this[0] = selector;
            this.context = selector.parentNode || selector;
            this.length = 1;
            return this;
        }

Otherwise, this:

jQuery( selector ).find( selector ) ; 

would be also valid ? Can context and selector be ever a same element ?

It seems clarification is required ...

--DBJ