javascript - Why is it hard to convert SVG to PDF client-side, isn't PDF vector format? -

i'm trying convert via javascript svg file pdf file. thought simple.

but i've seen online rasterizes svg , resulting pdf looks blurry. example:

http://ihaochi.com/svg_to_pdf/ (which converts svg png puts pdf document via jspdf)

but shouldn't pdf have vector capabilities? ie, don't want image inside pdf. want numeric values kind of way svg works, because prints better way.

actually, pdf not "vector" format. closest technical relative "eps = encapsulated postscript®."

i not assume pdf contains vector-drawing primitives expected "map one-to-one" in svg.