Example of Selector grouping and Contextual Selector on CSS

Question

I\'m going to have an exam tomorrow and I\'m trying to understand the meaning and the answer of

Selector grouping and Contextual Selector

While I searched

Answer 1

Basically what you looking at is the following.

for

a. Selector grouping example 

   td, th, li { property: value; }

what the above is saying that you want to have the same value for the same property for all td,th, and li

b. Contextual Selector example 

   table p { property: value; } 

this one is saying that you want to set the value for <p> tags that belongs to <table> tags

so whenever you have a <p> in a <table>, then it will get effected.

Answer 2

Selector grouping: Groups the kinds of elements to which style is applied.

Contextual Selector: Check the context of the class in the html tree, assigning the style to the element through a specific route, taking into account the order of depth in the tree.