Use admonitions to highlight non-intuitive behaviors that are easily missed

[jonrkarr]

Examples

• "The Fill of a Style has no meaning and, if present, will be ignored."
• "The Marker of a Style has no meaning and, if present, will be ignored."
• "... and can be anything"

As an example, here's how mkdocs enables developers to alert readers https://squidfunk.github.io/mkdocs-material/reference/admonitions/#admonition-icons