Why aren't my base styles updating in the preview?
If you're removing styling from a base style, those styles still apply until you have saved the base style.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
Base styles are CSS styles for HTML elements.
Yes, the component link field supports both internal and external URLs.
HTML is escaped when using Drupal tokens in Site studio as a security measure, this follows Drupal core.
Opacity is set using a decimal where 0 is transparent, 0.5 is 50% and 1 is solid.