Isn't float a box attribute in html?

Yes, float does not belong to the box attribute. Box attributes include: width, height, padding, padding-bottom, padding-left, padding-right, padding-top, margin, border, etc.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

The box pattern (model) is a thinking model used by CSS technology that is often used in web design. CSS assumes that all HTML document elements generate a rectangular element box that describes the space occupied by the element in the HTML document layout, which can be visualized as a box.

By defining a series of box-related attributes, the performance and layout structure of each box and even the entire HTML document can be greatly enriched and promoted.

css box mode (model), also known as box model (Box Model), is composed of several elements: element content (content), inner margin (padding), border (border), and outer margin (margin) composed (as shown in the picture below).

We can understand these attributes by transferring them to the boxes (boxes) in our daily life. The boxes we see in our daily life are also a kind of box that can hold things. They also have these attributes, so they are called It's box mode.

Box model (Flexible Box) Properties

1. Content area settings ( content):

• width: Width setting
• height: Height setting

The width and height settings can be Specific value (with unit), or it can be a percentage setting.

2. Setting of padding:

• The padding of the box is divided into four directions: top, right, bottom and left
• The setting of padding is used to control the distance between the content loaded in the box and the edge (border) of the box.
• The padding of the box occupies the space inside the box, the minimum is 0, and negative values ​​are not allowed.

Attribute	Description
padding	Use the abbreviated attribute to set in All padding properties in one declaration
padding-bottom	Sets the bottom padding of an element
padding-left	Set the left padding of the element
padding-right	Set the right padding of the element
padding -top	Set the top padding of the element

(Learning video sharing: css video tutorial)

3. Setting of margins

• The margins of the box are divided into four directions: top, right, bottom, and left.
• The setting of margins is used Controlling the distance around the periphery of the box does not belong to the scope of the box itself
• The main purpose of the margin is to control the position of the box, so negative values ​​can appear

Attribute	Description
margin	Abbreviation attribute. Set all margin properties in one statement.
margin-bottom	Set the bottom margin of the element.
margin-left	Set the left margin of the element.
margin-right	Set the right margin of the element.
margin-top	Set the top margin of the element.

4. Border settings

• Most element objects have no borders by default

• To set a border, 3 elements must be set at the same time: width, style and color.

• border composite attribute

• Extended attributes of borders classified by attribute elements (border-width: border width; border-style: border style; border-color: border color )

Attribute	Description
border	Abbreviation Attribute, used to set attributes for four sides in one statement.
border-style	is used to set the style of all borders of an element, or set the border style for each side individually.
border-width	Shorthand attribute, used to set the width of all borders of an element, or set the width of each border individually.
border-color	Shorthand attribute, sets the color of the visible part of all borders of the element, or sets the color for each of the 4 sides.
border-bottom	Abbreviation attribute, used to set all attributes of the bottom border into one statement.
border-bottom-color	Set the color of the bottom border of the element.
border-bottom-style	Set the style of the bottom border of the element.
border-bottom-width	Set the width of the bottom border of the element.
border-left	Abbreviation property, used to set all properties of the left border into one statement.
border-left-color	Set the color of the left border of the element.
border-left-style	Set the style of the left border of the element.
border-left-width	Set the width of the left border of the element.
border-right	Abbreviation property, used to set all properties of the right border into one statement.
border-right-color	Set the color of the right border of the element.
border-right-style	Set the style of the right border of the element.
border-right-width	Set the width of the right border of the element.
border-top	Abbreviation attribute, used to set all attributes of the top border into one statement.
border-top-color	Set the color of the top border of the element.
border-top-style	Set the style of the top border of the element.
border-top-width	Set the width of the top border of the element.

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