CSS floating property optimization tips: float and clear

CSS floating attribute optimization skills: float and clear

Introduction:
In web page layout, we often use the floating attribute (float) in CSS To achieve positioning and arrangement of elements. However, floating attributes can also cause some unexpected problems in some cases, such as overlapping elements, broken layout, etc. In order to better master floating properties, this article will introduce the optimization techniques of floating properties in CSS and provide specific code examples.

1. Basic usage of float attribute
The float attribute is used to specify that an element floats to the left or right of its parent element to achieve the arrangement effect of elements. The basic syntax is:
.float-demo {
float: left; / or right /
}

2. Common problems and optimization techniques of float attributes

1. Element overlapping problem:
   Floating elements will break away from the normal document flow, so it may cause element overlapping problems. The solution is to use the clear attribute.
2. The problem that the parent element cannot adapt to its height:
   When all the child elements inside the parent element are floating, the parent element will not be able to adapt its height, causing the layout to fail. The solution is to add an empty div at the end of the parent element and set clear:both.
3. Overlapping issues with elements that trigger external interference:
   When a floating element overlaps an external element (such as the previous sibling element of the floating element), it may cause layout errors. The solution is to add an empty div to the floated element's previous sibling and set the clear attribute.

The following are optimization tips based on the above issues and provide specific code examples:

Optimization Tip 1: Solve the element overlapping problem
.float-demo {
float : left;
}

.clearfix::after {
content: "";
display: table;
clear: both;
}

Optimization Tip 2: Solution The parent element cannot adapt to the height problem
.float-demo {
float: left;
}

.clearfix::after {
content: "";
display : table;
clear: both;
}

Optimization Tip Three: Solve the problem of overlapping elements that trigger external interference
.float-demo {
float: left;
}

.clearfloat::before {
content: "";
display: table;
}

.clearfloat::after {
content: "";
display: table;
clear: both;
}