CSS selectors based on attributes

Was redesigning my website, looked if there’s a smarter way to color links based on whether they are internal/external than manually adding classes to them. Well there is: Attribute selectors - CSS: Cascading Style Sheets | MDN

Attributes can be parsed based on prefixes, suffixes, containing something, belonging to a predefined list etc.

Full list: CSS selectors - CSS: Cascading Style Sheets | MDN