Web Front-endCSS TutorialChoosing the right reference parameters: What should you pay attention to when doing absolute positioning?
How to choose the appropriate reference parameters when using absolute positioning?
Absolute positioning is a positioning method in CSS. By specifying the position parameter of the element, the element determines its final position relative to its nearest parent element with positioning (relative, absolute, fixed, or sticky). When performing absolute positioning, we need to choose appropriate reference parameters to ensure that the element can be positioned accurately at the desired location.
Before choosing the appropriate reference parameters, we need to understand the following concepts:
- Positioning the parent element: The parent element that determines the reference position of the element. Normally, we set the position attribute to the parent element to specify its positioning method.
- Positioned elements: Elements that require absolute positioning.
- Reference parameters: parameters that determine the final position of the element, including left, right, top, and bottom.
In the process of selecting appropriate reference parameters, we need to consider the following aspects:
- Select the positioning parent element: The positioning parent element should be closest to the positioning element Positioned elements. We can use the position attribute in CSS to set the positioning method for the parent element, and select relative, absolute, fixed or sticky according to specific needs.
-
Determine reference parameters: According to actual needs, select appropriate reference parameters to ensure the accuracy of the final position of the element.
- left: The distance between the left edge of the element and the left edge of the positioned parent element.
- right: The distance between the right edge of the element and the right edge of the positioned parent element.
- top: The distance between the upper edge of the element and the upper edge of the positioned parent element.
- bottom: The distance between the bottom edge of the element and the bottom edge of the positioned parent element.
The following is a specific code example to show how to choose appropriate reference parameters:
<!DOCTYPE html>
<html>
<head>
<style>
.relative {
position: relative;
width: 300px;
height: 200px;
border: 1px solid black;
}
.absolute {
position: absolute;
width: 100px;
height: 100px;
background-color: red;
}
.left {
left: 20px;
top: 20px;
}
.right {
right: 20px;
top: 20px;
}
.top {
left: 50%;
top: 20px;
transform: translateX(-50%);
}
.bottom {
left: 50%;
bottom: 20px;
transform: translateX(-50%);
}
</style>
</head>
<body>
<div class="relative">
<div class="absolute left"></div>
<div class="absolute right"></div>
<div class="absolute top"></div>
<div class="absolute bottom"></div>
</div>
</body>
</html>In this example, we create a relative positioning The parent element is relative, and four absolutely positioned child elements are created in it. By setting different reference parameters, different positioning effects of these four sub-elements in relative are achieved.
Through the above example, we can see how to choose appropriate reference parameters to determine the exact position of an element. According to specific layout needs, you can achieve more flexible and precise positioning effects by adjusting the values of the reference parameters and using other CSS properties.
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