HTML Margin test

This page is meant to demonstrate what happens when a margin is set on the HTML tag itself. This is achieved by the user of some CSS in margintest.css which looks like this:

html {
    margin: 1em;
}

This should put a 1em margin around the entire page which should not be clipped by the window at any point; nor should it cause the links to be offset etc.

Before if this is broken/a problem then the following link's hotspot within browser windows will be offset up/left by 1em and the window itself will not scroll properly to the bottom.

Here is a link to myself.