This video starts with a quick breakdown of the different CSS font-families (both generic and specific) and then moves into how to provide back-up fonts via CSS font-stacks in case your first choice of font is not supported by a browser, this helpful video then moves into the discussion of font sizes.
As with many of the smaller details dealt with through CSS, this is actually an area of some debate. The thing to consider here is the measurement type you choose to use, i.e.
font-size:em. Each of these options deals with measurement in relation to the document in question differently. Understandably, some time is spent explaining the finer points of this before things are wrapped up.
You can save a little time and space by using some font shorthand coding, which is showcased next in this video. There is obviously a lot more to cover when it comes to fonts and CSS, but there is only so much you can do in less than 15 minutes. So if you are interested in learning more about fonts, typeface, etc you may like our recent posts on Google Webfonts or how to create a Letterpress effect, which are both much more advanced than this basic installment.