I was searching for a solution for integrating pdf files in html.
(Tex, Latex, Music, math formulas ... )

And I was very surprised how easy that was !!!

There is svg. In easydebian there is a package pdf2svg. Microb can display svg files without any external viewer.
The conversion is very fast.

This could be a very easy way to display pdf files inside the browser, without an external viewer.
A perl script could temporary convert the pdf to svg and display the svg file.