HTML and CSS Reference
Angular position when used with be-
The leftwards keyword subtracts 20 degrees from the parent element's
azimuth . Similarly, rightwards adds 20 degrees to the parent element's
azimuth . Note that this process can continue until you work your way
around the listener; these values add or subtract 20 degrees no matter
what the azimuth of the parent is.
The elevation property accepts an angular value ranging from -90 de-
grees to 90 degrees, corresponding to from directly below the listener
to directly above the listener. Zero degrees is considered to be level
with the listener's ears. You can also use the below, level , and above
keywords for -90, 0, and 90 degrees, respectively.