Sounds tricky at first, but this can easily done using the IFrame.The html page to embed can be added to the main page as an IFrame.In this way In-line frames can be used to add small notes and other pieces of information into the main page.

In order to do the so, do the following:
Go the location in the main page where you want the iframe, and add the following:
    <iframe src="target.html" width="200" height="200" align="right">
               This is an in-line frame.
    </iframe>

Using an iframe is very similar to that of the image except that it can embed another page rather than the picture itself. The src attribute defines html page to be embeded. This can be a local page on the server or a page from a remote server. You define size of the iframe be defining the the height and width attributes of the iframe.

Currently all most all the latest browsers support iframe tag, however if browser does not support it, you can  include text within the two tags that would be printed instead of rendering the iframe.