The scores come in pdf format, sometimes copies of the original edition, sometimes in a modern typesetting and sometimes taken from a later complete edition. I would include a page as an example, but you can't insert pdf files into blogger. But go have a look. It is a remarkable resource. There are others on the web, but I find IMSLP quite useful. Here is a link to a Beethoven bagatelle, for example.
I couldn't find the same F minor Bagatelle on YouTube, so this is one in G major played by Sviatoslav Richter.