I would like to have a link that when is clicked, automatically starts the download of the printable version of the web page.

I'm using Moodle. The content I want it's exactly the same If I download the page using ctrl + p and saving as pdf or using

<a href=whatever.htm onClick=window.print();return false>Download web page</a>

I want exactly that content because using this way, the header, sidebar and footer is removed. I don't want css.

I'm not using this because this doesn't work in some browsers.

I'd rather not using pdf libraries like tcpdf because Moodle loads the content in a dynamic way and send this to a libraries like that is a mess.

I tried using sites like pdfcrowd.com but this kind of sites don't work when the site you want to convert to pdf uses a server-side session to identify the user.