CSS thorough research (1)

CSS thorough research (1)

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Basic Selector

Tag Selector h1 {...}

Category. class_name{.}, two classes simultaneously, such as class = ' One two ', conflicts take the former

ID selector #id {...}

Composite selector: Two or more selectors that connect in different ways

Intersection

H3.class_name {...}

The first one must be a tag selector, the second must be (category selector) or (ID selector), no space in the middle, must be written continuously

The A_selector selector, B_selector is also a plurality of selectors

Descendant Selector

div p {/* div below P, including all Descendants */}

direct descendants of Div>pdiv

CSS Inheritance

The contained small container inherits the style of the large container containing it.

As a result, EM inherits the H1 underline.

CSS Precedence

Inline style (style=) > ID style (#id) > class style (. Class) > Markup Style (div)

Two class conflicts, take the former

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