You can't even reliably fit raster images to screen pixels on the web. Images can easily end up at non-integer screen pixel locations which requires resampling

You can't even reliably fit raster images to screen pixels on the web. Images can easily end up at non-integer screen pixel locations which requires resampling (and ruining your careful alignment) to render. Logo design should be done in-context, not in a dark room at 400% zoom.