Define advanced safari settings: "never use font size smaller ..." from javascript?

Safari (mac) has an option under Safari -> preferences -> advanced that disabled the use of fonts smaller than the specified point size.

I am writing a PDF application using PDF.js, which causes the fonts to be huge and overlap when this option is enabled.

I am trying to figure out if there is a way from javascript to determine if this setting is enabled or not before downloading the PDF and then instead download a message explaining to the user what they need to do to view the PDF correctly.

Any idea?