Style Rule ↔ Ruleset with Selector & CSS Declaration block

Specificity

Weighting Algorithm for Layout engine to choose which competing Selector Style Rule to apply to HTMLElement

CSS Declaration

Pair of CSS Property with value

References

1. Selector ↔ CSS Syntax to define pattern to match HTMLElement instances (& special states) in document to direct Style Rule

2. Specificity ↔ Weighting Algorithm for Layout engine to choose which competing Selector Style Rule to apply to HTMLElement

3. List Selector ↔ , comma separated list of Selector to share & reuse Style Rule

4. CSS ↔ Stylesheet Language to express style & layout of (HTML) via Style Rule

5. Specificity ↔ CSS Weight Algorithm to determine which Style Rule clash to apply; by IICE order

6. Source Order ↔ Last rule overides all previous Style Rule

7. @mixin ↔ At-Rule to Encapsulate Style Rule with optional args

8. @media ↔ At-Rule to conditionally apply Style Rule vs Media Query

9. Media Query ↔ CSS Syntax to query Media Type Attribute to adapt Style Rule vs screen config