What is the css box model? A brief introduction to the css box model-CSS Tutorial-php.cn

What is the css box model? A brief introduction to the css box model

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Release： 2018-09-27 15:48:09

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Box model

1. Definition

1. Any element can be used as a box model
2. The size of the box is determined by the content width/height ) Margin (padding) Border (border)
3. The box is affected by the outer margin (margin), which affects the position of the box
Generalized box model: all functional and content tags in the document, and all display properties in the document Tags.
Narrow box model: Tags that exist in block-level form in documents (block-level tags have 100% of the characteristics of the box model and are the most commonly used)

2. Introduction to box model members

content

Specify content by setting width and height
Block-level tags can set their own width and height, and the default width is the parent width (width =auto), the height is automatic (expanded by content)
Inline tags cannot set their own width and height, and the default is automatic (expanded by content)

border

##Border (border) consists of three parts: border-width (width), border-color (color), and border-style (style)
border members: border-left, border-right, border-top, border-bottom
##border-style members: border-left-style, border-right-style, border-top-style, border-bottom-style

StyleExplanationsolidsolid linedashed linedotted lineDouble solid lineGroove lineridgeInset effect lineOuter convex effect linemargin


	##dashed
	dotted
	double
	groove
	ridge
	inset
	outset

##margin members: margin-left, margin-right, margin-top, margin-bottom

margin overall setting
##Number of assignments

azimuthUp and down and left and rightSummary: 1. Specify the starting position 2. Clockwise 3. Not looking for the opposite side

	1
2	Up and down\|Left and right
3	Up\|Left\|Down
4	Up\|Right\|Down\|Left

border-radius

border-radius member

member

Explanationupper left position

border-top-right-radius

upper right position

border-bottom-left-radius

lower left position

border-bottom-right-radius

Bottom right radius

Single direction setting

Number of assignments (value type: length or percentage): 1 Interpreted as: horizontal and vertical
Number of assignments (value Type: length or percentage): 2 Interpreted as: horizontal | vertical

Divided overall setting

Format: 1/1 Interpreted as: Horizontal|Vertical

4. Other related attributes

max|min-width|height
##overflow

Value##visiblehiddenscrollautoinherit


default value. The content will not be trimmed and will be rendered outside the element box.
The content will be trimmed and the remaining content will be invisible.
The content will be trimmed, but the browser will display scroll bars to view the remaining content.
If content is trimmed, the browser displays scroll bars to view the remaining content.
Specifies that the value of the overflow attribute should be inherited from the parent element.

##display

##value DescriptioninlineinlineblocklevelInline-blockBox Basic introduction to model layout


	block
	inline-block
	##5. Box model layout

Layout orientation: margin-left, margin-right, margin-top, margin-bottom

Influence its own layout: margin-left, margin-top
Influence sibling layout: margin-right, margin-bottom
Forward/reverse: positive value / Negative values
margin layout pit

Many semantic tags have default margin

Parent and child tags Whichever of the margin-top overlaps is larger
Brother tag margin-bottom, margin-top overlaps whichever is larger

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