Create relative scope detection & use the relative parent to adjust the calculation

Create relative scope detection & use the relative parent to adjust the calculation

If a nested off-canvas element is placed in a container with position:relative (mostly push/pull classes) this must be considered in the calculation of the fixed position emulation.
To detect the relative scope I'm checking if the closest positioned element (offsetParent) has a left css value (typical for push/pull) or is affecting the top coord.
The usage of adjustToLocalScope() is limited to nested elements because non-nested elements doesn't have that scope issue (due to position:fixed)