ltip is 14px below.
        expect(contentRect.left).to.be.equal((100 - 70)/2);
        expect(contentRect.top).to.be.equal(20 + 14);

        // Also check the math, just in case.
        expect(contentRect.left).to.be.equal((divRect.width - contentRect.width)/2);
        expect(contentRect.top).to.be.equal(divRect.height + tooltip.offset);
      });

      test('tooltip is positioned correctly (top)', function() {
        var f = fixture('basic');
        var target = f.querySelector('#target');
        v