Module Review
X21c: Understanding the Cascade


QUESTIONS
---------

1. Define "cascade" in the context of Cascading Stylesheets




2. Explain the concept of "specificity".





3. Explain the effect on specificity of grouping selectors in a style. 






4. What is the specificity level of each of the following? 
§	selectors                    ___
§	classes                      ___
§	IDs                          ___
§	pseudo-classes               ___
§	pseudo-elements              ___
§	inline styles - officially:  ___
                  - in practice: ___

5. Discuss the specificity effect of the !important modifier.




6. Explain the role of inheritance in applying styles.











7. What is the effect of rule- ordering in applying styles?










ANSWERS
-------

1. "The cascade" is the way in which styles interact with one another, how they flow from one element to another in the tree-diagram browsers construct for themselves.	[X21cA1]

2. Specificity is a simple calculated way to figure out which rule prevails when two are in conflict. 	[X21cB1]

3. When selectors are grouped together without commas to indicate a rule that applies to one selector only when it's inside another, the specificities are added together. When selectors are separated by commas, each retains its own specificity of 1.	[X21cC1]

4. What is the specificity level of each of the following? 
§	selectors          1
§	classes           10
§	IDs              100
§	pseudo-classes    10
§	pseudo-elements   10
§	inline styles    100  (officially)
§                   1000 (in practice)
			[X21cD1]

5. The !important modifier adds a specificity of 10,000 to a property	[X21cE1]

6. An element may have stylistic properties that are inherited, and others that are not. Those that are inherited are passed along to all elements contained in the first element - that is, those that hang from it in the tree-diagram. However, if the contained elements are assigned different values for the inherited property, the assigned value will have greater specificity, and so replace the inherited value..	[X21cF1]

7. The rule that comes last wins.	[X21cG1]