Summary of Common Terms in CSS (Cascading Style Sheet)

If you use CSS don't forget to write DOCTYPE, document type definition.
Standard box model

1. Element classification Block-level elements (block)
Div+css (DIV and CSS are both containers)
 is a paragraph tag, a block-level element.
Inline elements
Span does not respond to box model properties.
2. Standard flow The arrangement of labels.
3. Box model Put the element into the box with a margin of 4 (take the maximum value when two are together, do not add the sum)
Padding 4 content areas (width and height)
Border 4
Styles can be written together.
4. Float Depart from the standard flow.
5. Positioning Absolute: absolute deviates from the standard flow and is absolute to the box that contains the element.
Relative: relative to the original position but not out of the standard flow
6. Setting the hyperlink style
a:link is the initial state of the hyperlink
a:hover is the state of hovering when the mouse is placed on it
a:active is when the mouse is clicked
a: visited is the situation after visiting
7. CSS hack (For more information about CSS hack, please visit: http://baike.baidu.com/view/1119452.htm)
*margin-top:10px!important; /*Only IE678 recognizes this rule*/
_margin is only recognized by IE6.
Other core browsers can recognize!Important (increase priority)
Solve the IE gap problem: Margin-top: -2em Make the outer border two e units upward
8. These three attributes must be present when loading the cut image
background-image
background-position
background-repeat: /*no repeat*/
9. * Space represents the settings for all elements

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Summary of Common Terms in CSS (Cascading Style Sheet)

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