In CSS, you can use the border-radius attribute to make a circle; the border-radius attribute can add a rounded border to an element. You only need to set "border-radius: 100%" to a square element with the same width and height. ;" style is enough.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
p Css to make a quarter circle mainly uses the border-radius rounded corner hidden attribute in Css3.0. Using this attribute, we candraw a circle, a semicircle, and a quarter circle Three circles, quarter circles, etc. I will update in the future...
How to use the border-radius attribute, the following is the most basic method of using the border-radius attribute:
.round {
border-radius: 5px; /* 所有角都使用半径为5px的圆角，此属性为CSS3标准属性 */
-moz-border-radius: 5px; /* Mozilla浏览器的私有属性 */
-webkit-border-radius: 5px; /* Webkit浏览器的私有属性 */
border-radius: 5px 4px 3px 2px; /* 四个半径值分别是左上角、右上角、右下角和左下角 */
}1. Use border-radius to draw a circle:
#circle {
width: 200px;
height: 200px;
background-color: #a72525;
-webkit-border-radius: 100px;
/*-webkit-border-radius: 100%;*/
}Think about it carefully, the radius of the largest circle in a square (200*200) is: 100.
2. Hollow circle code: The hollow circle actually has only a border, and the hollow part is filled with other colors:
#circle {
width: 200px;
height: 200px;
background-color: #efefef; /* Can be set to transparent */
border: 3px #a72525 solid;
-webkit-border-radius: 100px;
} 
Similarly dotted circle code:
#circle {
width: 200px;
height: 200px;
background-color: #efefef; /* Can be set to transparent */
border: 3px #a72525 dashed;
-webkit-border-radius: 100px 100px 100px 100px;
}
3. Semicircle and quarter circle codes :
#quartercircle {
width: 200px;
height: 200px;
background-color: #a72525;
-webkit-border-radius: 200px 0 0 0;
}
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<style type="text/css">
#quartercircle{
width: 200px;
height: 200px;
background-color: #ffffaa;
border-radius:0 0 0 200px;
-webkit-border-radius: 0 0 0 200px;
-moz-border-radius: 0 0 0 200px;
-ms-border-radius: 0 0 0 200px;
-o-border-radius: 0 0 0 200px;
}
#quartercircle .dianxuan{
font-family:Arial;
color:gray;
font-size:25px;
padding-top: 55px;
padding-left: 90px;
transform:rotate(32deg);
-ms-transform:rotate(32deg); /* Internet Explorer */
-moz-transform:rotate(32deg); /* Firefox */
-webkit-transform:rotate(32deg); /* Safari 和 Chrome */
-o-transform:rotate(32deg); /* Opera */
}
</style>
</head>
<body>
<div id="quartercircle">
<div>点选</div>
</div>
</body>
</html>
Explanation:
-moz(for example-moz -border-radius) for Firefox
-webkit (for example: -webkit-border-radius) for Safari and Chrome
Among them, the support of each browser of border-radius is as shown in the table:
| Browser | Support |
|---|---|
| Firefox(2, 3) | √ |
| Google Chrome(1.0.154…) | √ |
| Google Chrome(2.0.156…) | √ |
| Safari(3.2.1 windows) | √ |
| Internet Explorer(IE7, IE8) | × |
| Opera 9.6 | × |
(Learning video sharing: css Video tutorial)
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