New border attributes in css3: 1. "border-image", which is an abbreviated attribute used to set the style of the element's border; 2. "border-radius", which is used to set the four corners of the element. Rounded corner style; 3. "box-shadow", this attribute is used to set one or more drop-down shadow boxes of the element.
The operating environment of this tutorial: Windows 10 system, CSS3&&HTML5 version, Dell G3 computer.
What are the new border attributes in css3
In css3, the new border attributes are: border-image, border-radius and box-shadow property.
1. border-image
The border-image attribute is a shorthand attribute used to set the following attributes:
Examples are as follows:
<html>
<head>
<style>
div
{
border:15px solid transparent;
width:300px;
padding:10px 20px;
}
#round
{
-moz-border-image:url(/i/border.png) 30 30 round;/* Old Firefox */
-webkit-border-image:url(/i/border.png) 30 30 round;/* Safari and Chrome */
-o-border-image:url(/i/border.png) 30 30 round;/* Opera */
border-image:url(/i/border.png) 30 30 round;
}
#stretch
{
-moz-border-image:url(/i/border.png) 30 30 stretch;/* Old Firefox */
-webkit-border-image:url(/i/border.png) 30 30 stretch;/* Safari and Chrome */
-o-border-image:url(/i/border.png) 30 30 stretch;/* Opera */
border-image:url(/i/border.png) 30 30 stretch;
}
</style>
</head>
<body>
<div id="round">在这里，图片铺满整个边框。</div>
<br>
<div id="stretch">在这里，图片被拉伸以填充该区域。</div>
<p>这是我们使用的图片：</p>
<img src="/static/imghwm/default1.png" data-src="/i/border.png" class="lazy" alt="What are the new border attributes in css3?" >
<p><b>注释：</b> Internet Explorer 不支持 border-image 属性。</p>
<p>border-image 属性规定了用作边框的图片。</p>
</body>
</html>Output results:
2, border-radius
border- The radius attribute is a shorthand attribute, used to set the rounded style of the four corners. The syntax is as follows:
border-radius: 1-4 length|% / 1-4 length|%;
The example is as follows:
<html>
<head>
<style>
div
{
text-align:center;
border:2px solid #a1a1a1;
padding:10px 40px;
background:#dddddd;
width:350px;
border-radius:25px;
-moz-border-radius:25px; /* 老的 Firefox */
}
</style>
</head>
<body>
<div>border-radius 属性允许您向元素添加圆角。</div>
</body>
</html>Output result:
3. box-shadow
The box-shadow property can set one or more drop-down shadow boxes. The syntax is as follows:
box-shadow: h-shadow v-shadow blur spread color inset;
The example is as follows:
<html>
<head>
<meta charset="utf-8">
<title>123</title>
<style>
div
{
width:300px;
height:100px;
background-color:yellow;
box-shadow: 10px 10px 5px #888888;
}
</style>
</head>
<body>
<div></div>
</body>
</html>Output result:
(Learning video sharing: css video tutorial)
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