When generating pdf from an html and css it generates the pdf with the different size to the one that I have in css, to what is this symptom due?

In css I have 9pt and 8pt but in pdf it gives me 7pt and 6.5pt
When generating pdf from an html and css it generates the pdf with the different size to the one that I have in css, to what is this symptom due?

In css I have 9pt and 8pt but in pdf it gives me 7pt and 6.5pt
This could depend on which engine you are using to render the pdf, IE / Geko for v10
You can set the render type when generating make sure the following are set for the best results.
It should be noted that v10 is 2 versions behind the current one and it might help to upgrade.