Specify whether all generated anonymous CSS rules must be stored in the external CSS file (global style sheet).
Anonymous CSS rules are CSS rules generated from the formatting settings specified on template components. They are called "anonymous" because these are basically sets of inline CSS properties initially generated for particular HTML tags and, then, moved to a style sheet to eliminate their repeating across the HTML file(s). Now, only class selectors assigned to those CSS rules are specified in the HTML tags (instead of the original CSS properties). But the class selectors are generated automatically, which depends on how early a particular CSS property set was registered in the style sheet. That makes them completely unpredictable and dependent on the data being documented, which prohibits substituting the anonymous rules with any custom ones.
When this option is selected (true), all anonymous rules generated across all generated HTML files will be collected in the global style sheet (which is printed further as the external CSS file). That produces the most compact documentation files, because many anonymous rules repeat themselves across different HTML document. So, it is the default setting.

When this option is unselected (false), the anonymous rules will be generated and stored locally by each HTML document where they are used. The global style sheet won't include anonymous rules. You may want this in the following situations:

${include css_usage_link.htm}