html - Safari Background Image Quirk -

so seems safari (latest version) not following code involving background image:

div.nav_element.pdf {     background-image:url("/images/pdf_icon.png");     background-position: right 19px bottom 50%;     background-repeat:no-repeat; }  <div class="nav_element pdf">     <a class="nav_link" href="#">summary of product characteristics</a> </div> 

it tells me background-position property invalid via little yellow exclamation point box. has seen before? not relative sizing?

because background-position property invalid. have 2 values, not 4.
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