3 Graphics look the same whatever computer you look at them on. The contents of the middle and right-hand columns above are, in fact, graphics so that I can show you the differences whichever machine you are looking at this on. The size of the text in the Text column will depend on which machine you are looking at this on. Font sizes on the web are NOT specified in points. This allows the user to set their browser to show a bigger or smaller type size than the page author intended.
Text size is specified as an attribute of the FONT tag.
Don't EVER use size 1 though. There are three important issues here. Make sure there is high contrast between your background page colour and the text colour. The next sentence is in a paler colour blue. It is almost illegible.