[DNSB]

Another piece of unasked for advice, if you are creating an ebook that will be read by others, do not force fonts. Fonts which look good on your LCD monitor are very often not as good looking on a smaller device or an e-Ink display. You may also want to consider that fonts such as Arial which is owned by Monotype and has a cost associated with embedding are a bad choice when producing books for others to read.

Two other items are specifying fonts sizes in absolute values (16pt in your sample) is not a good idea and you might also want to remove the Microsoft specific bits since there is no guarantee that your renderer will understand it (a renderer is the software that translates your work into pixels) or handle a failure to understand it correctly.