grouping
(1) Put class="" in each element of tag ex) class="saw"
(2) Attach . before the class value ex) .saw
Can have multiple values
(1) Separate into spaces
2. Tag (=element)
Can have "multiple Properties"
(1) Can control a tag jointly by using various selectors.
(2) However, It is not good choice. Because later order take priority.
1. Class property
class=""
in each element of tag ex)class="saw"
(2) Attach.
before the class value ex).saw
2. Tag (=element)
3.
id
selectortag(comprehensive) < class < id(intensive)
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