Improve "Tags" API

[HiGreg]

Just so I can save this idea for later:

This is the first I’ve noticed the Tags class. I’m thinking this would be a great implementation for the GUI CSS implementation I’m working on. Specifically, using tags as the CSS “class” selector. Previously, I was thinking to ask for a CSSClass property added to the GUI Control class, but the Tags class seems a very apt substitute.

The most relevant description of CSS Class I’ve posted is:

@HiGreg

CSS Selectors

A basic selector takes the form of type.class#id[attr=value] where

• type is a type of element (HTML: div, a, button,input). For Babylon, propose using the result of .getClassName()
• class is a user-assigned grouping of elements with an assigned a “class” attribute. There is no current Babylon equivalent. For Babylon, propose adding a new attribute to the base Control object: cssClass, class, group, or similar.
• id is a user-defined identifier intended but not required to be unique. This mirrors the Babylon Control.name property.

CSS Selectors include the concept of specificity in the final selection of which property assignments apply. Although this may not be significant to implement, it might be an easy addition to property selection.