Tests the effect of setting font-size on the root <html> element. Demonstrates that
setting a fixed font-size on the <html> element will overwrite any browser font size
settings (as opposed to say the browser applying an additional multiple to the <html>
font-size based on browser font size settings.
For this reason avoid setting a fixed font-size on the <html> element.
You can test this by looking at the results of the code examples below, then change your browser font size settings and see what difference it makes.
Using the default font-size on the <html> element.
Using a fixed font-size: 10px on the <html> element.