[re recognize HTML (1), two Java rookies' 4-sided bytes beat and become slag in seconds

Cxy happy 2021-08-08 21:34:42
recognize html java rookies 4-sided


Numbers with circles , Marks the position of the floating element before floating

Rule5: Floating elements cannot be stacked

  • If an element floats , Another floating element is already in that position , The last floating element will be close to the previous floating element ( Left float find left float , Right float, right float )

  • If there is not enough space left in the horizontal direction, display floating elements , The floating element will move down , Until there is enough space

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Rule6: The top of a floating element cannot exceed the top of the containing block , Nor can it exceed the top of all previous floating elements

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Sample code :float-rule_01float-rule_02float-rule_02- other float-rule_03

Floating applications


Floating common scenarios :

  • Resolve inline elements 、inline-block Horizontal clearance of elements

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  • Layout

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The problem with floating : High collapse


Because the floating element is out of the standard flow , It becomes a de standard element , So no longer report height to the parent element

When calculating the total height of the parent element , The height of the floating child element will not be calculated , Led to High collapse The problem of

The process of solving the problem of high collapse of parent elements , Generally called Clear float ( Clear the float 、 Remove the floating )

  • The purpose of clearing floating : Let the parent element calculate the total height , Take the height of the floating child element into account

Code : Floating problem

Common methods of clearing floating


Set the parent element to a fixed height

Let the parent element float

  • It may cause all elements in the page to float

  • The parent element is out of the standard flow

  • Changed the box properties of the element ( Not recommended )

  • Code : Clear float -02

Make the parent element an absolute positioning element (position Set to absolute or fixed)

  • The parent element is out of the standard flow

  • Changed the box properties of the element ( Not recommended )

  • Code : Clear float -03

Set the parent element display by inline-block、inline-table、table、table-cell、table-caption

  • Changed the box property of the parent element ( Not recommended )

  • Code : Clear float -04

Set the parent element overflow by visible Value beyond ( such as hidden、auto、scroll)

  • Changed the default behavior of the parent element for content overflow ( Not recommended )

  • Code : Clear float -05

Add an empty block level child element at the end of the parent element , And let it set clear: both

  • Will add a lot of meaningless empty tags , Maintenance trouble

  • It violates the principle of separating structure from style ( Not recommended )

  • Code : Clear float -06

Add a... At the end of the parent element br label <br clear="all">

  • Will add a lot of meaningless empty tags , Maintenance trouble

  • It violates the principle of separating structure from style ( Not recommended )

  • Code : Clear float -07

None of the above methods are recommended , Just know

Add... To the parent element ::after Pseudo elements

  • pure CSS Style solution , Separation of structure and style ( recommend

.clear-fix::after {
content: "";
display: block;
clear: both;
height: 0; /* Compatible with old browsers */
visibility: hidden; /* Compatible with old browsers */
}
.clear-fix {
*zoom: 1; /* compatible IE6~7 browser */
}

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Sample code : Clear float - Recommend solutions

CSS attribute - clear


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