Pointer Events [Optional]
Indicates a layer can become the target of mouse events. The value is 'all' by default which is interited from parent layer.
The value 'none' instructs the mouse event to go "through" the layer and target whatever is "underneath" that layer instead.
For example, setting Pointer Events of a layer to 'none' can make a link layer (underneath this layer) clickable.
Note the equivalent html code looks like <div style="pointer-events:auto|none|all" >