2) customHTML also allows for style tags if you want to override a class or create a new one for a control. <style></style>
3) CSS Control – In the CSS control, you can inport a css file as a web, external, server, or design. To have a control reference a class, have a reference in the HTML Attributes.
While customHTML allows you to type css directly into the HTML section. The CSS control provides flexibility to developers that want to import css files through different mediums; which can then have controls reference classes.
Essentially, customHTML and the CSS control provides very similar functionality, but the CSS Control provide an additional convenience for developers.