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Css

Full name Cascading Style Sheet

Introducing css into html pages

1, written in the head tag

two,

3, embedded styl

Syntax:

Selector {

Attribute name: attribute valu

Proterty1:value

Width:100px

/ * Notes * /

...

Browser private properties

Chrome,safari

-webkit-

Firefox

-moz-

IE

-ms-

Opera

-o-

Attribute value syntax

Padding: [| | auto] {1pm 4}

Grammatical description

1, basic element: refers to key words such as length auto in grammar

2. The combination conforms to: it means that the grammatical descriptions are consistent, and different symbols represent different meanings.

3, quantity symbol: {} and number

Basic elements:

Type: basic type (,.)

Other types (,.)

Symbol: (/,)

Inherit, initial

Combination coincidence

Spaces: the order of numbers must be the same and the number must be the same, as follows

Legal value: 12px arial

Illegal: arial 12px

12px

& &: & & two values must appear and do not need to be in the same order

Legal: green 2px

1em blue

Illegal: 1em

| |: at least one occurs. The order is not required. |

| |: only one of them can appear, not at the same time |

: bold [|] grouping function

Quantity symbol:

None: indicates that the basic element can only appear once

+: appear one or more times [,] +

Legal values: # fff, red, gray

? : may or may not appear as an optional inset? & &

Inset blue

Red

{}: indicates that the basic element appears at least several times and at most several times {2pr 4}

*: can appear 0J1, or more than once

#: need to appear one or more times, separated by commas multiple times

@ rules

@ identifier xxx

@ identifier xxx {}

Commonly used: @ media

@ keyframes

@ font-face

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