Cascading Style Sheets: "The CSS Cascade"
What does the "cascade" in "cascading style sheets" mean? What happens if there is presentational markup in an HTML file and conflicting information in an external style sheet? Though difficult, the concepts in this chapter are crucial for understanding how and when style rules are applied, especially when inline, embedded, and externally linked style rules are present in the same page or site.
Click https://en.wikibooks.org/wiki/The_CSS_Cascade link to open resource.