Detailed explanation of the default values of width and height in CSS: auto and %

in conclusion

% of width: defines the percentage width based on the width of the containing block (parent element), which will exceed the parent's limit
Width auto: Try to be wrapped by the parent
% of height: Based on the percentage height of the block-level object containing it, it will exceed the limit of the parent
Height auto: Try to be wrapped by the parent

Case

Be sure to copy the code and run it again, and spend a few minutes to experience how to be wrapped by the parent and break through the parent's restrictions

Width Case

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        * {
            margin: 0;padding: 0;
        }
        body {
            background: #dcdcdc;
        }
        .box {
            width: 400px;
            border: 3px solid red;
            padding: 0 50px;
        }
        .box1 {
            width: auto;
            height: 100px;
            background: pink;
            padding: 0 50px;
            margin: 0 50px;
            border-width: 0 50px;
            border-style: solid;
            border-color: green;
        }
        .box2 {
            width: 100%;
            height: 100px;
            background: gold;
            padding: 0 50px;
            margin: 0 50px;
            border-width: 0 50px;
            border-style: solid;
            border-color: green;
        }
    </style>
</head>
<body>
<div class="box">
    <div class="box1"></div>
    <div class="box2"></div>
</div>
</body>
</html>

Height Case

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        * {
            margin: 0;padding: 0;
        }
        body {
            background: #dcdcdc;
        }
        .box {
            width: 400px;
            border: 3px solid red;
            padding: 50 0px;
            height: 400px;
        }
        .box1 {
            width: 200px;
            height:auto;
            background: pink;
            padding: 50px 0px;
            margin: 50px 0px;
            border-width: 50px 0px;
            border-style: solid;
            border-color: green;
        }
        .box2 {
            width: 200px;
            height:100%;
            background: gold;
            padding: 50px 0px;
            margin: 50px 0px;
            border-width: 50px 0px;
            border-style: solid;
            border-color: green;
        }
     
    </style>
</head>
<body>
<div class="box">
    <div class="box1"></div>
    <div class="box2"></div>
</div>
</body>
</html>

This is the end of this article about the default values of width and height in CSS, auto and % cases. For more relevant CSS width and height default values, please search 123WORDPRESS.COM's previous articles or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!

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