html editor widget in new Site Builder is still not able to vary the font size
Using Jamroom
The idea is that you control the size of text on your site by elements (i.e. h1, h2, p, etc.) instead of by specific font size - this then allows you to CHANGE the font-size site-wide with a simple change in your CSS. If you choose to use a specific font size in a post using the HTML editor, that font size is "stuck" at that size until you manually change it. So if you want to make ALL your site wide h1 tags be 30pt font, you could not do that if you specifically set an h1 tag to a font size in the editor.