ec7dfa48_F_API_with_CSS2_and_JavaScript__Parameter
[Description] The level of opacity you want for your watermark. This is a “real” number between 0 and 1. 0 is fully transparant and 1 is fully opague (what some call a ‘stamp’). [Parameter] 
wm_opac
w m
w m _ x
w m _ y
w m _ a n g l e
w m _ o p a c
w m _ s x
w m _ s y
HTML to PDF API with CSS2 and JavaScript
Parameter