CSS3 content attribute implementation steps
We know that the pseudo-classes of :before" and ":after" appear in CSS3, so today we will teach you the steps to implement the content attribute of CSS3. The following is a case, let's take a look.
css3 appears in ":before", ":after" pseudo-classes,
You can write like this:
h1:after{
content:'h1后插入的文本';
...}The functions and effects of these two selectors will not be introduced here. Let’s mainly talk about the css attribute content mentioned above, which is used with the :after and :before pseudo-elements to display content before or after the object.
The value of content:
##. #normal: Default value. Behavior is the same as none value. image, audio, video or any other resource supported by the browser)list-style-type
): Use named counters and comply with the specified list-style-type attributecounters(name,string): Use all named counters
counters(name,string,list-style-type): Use all named counters and comply with the specified list-style-type attribute no-close-quote: Do not insert the post-tag of the quotes attribute . but increases its nesting level no-open-quote: does not insert the before tag of quotes attribute but decreases its nesting level close-quote: inserts the after tag of quotes attribute. open-quote: Insert the pre-mark of the quotes attribute The values that are difficult to understand here are: counter(name); The following mainly summarizes this section , and finally a demo of each value will be given. For example, I have the following html structure:<ul> <li>这个是有序列表</li> <li>这个是有序列表</li> <li>这个是有序列表</li> <li>这个是有序列表</li> <li>这个是有序列表</li></ul>
ul li{
counter-increment:index;
}
ul li:after{
content:'统计：'counter(index);
display:block;
line-height:35px;
}<!DOCTYPE html><html><head><meta charset="utf-8"><title>CSS content</title><meta name="author" content="phpstudy.net"><meta name="copyright" content="www.phpstudy.net"><style>
.string p:after {
margin-left: -16px;
background: #fff;
content: "支持";
color: #f00;}
.attr p:after {
content: attr(title);}
.url p:before {
content: url(https://pic.cnblogs.com/avatar/779447/20160817152433.png);
display: block;}
.test ol {
margin: 16px 0;
padding: 0;
list-style: none;}
.counter1 li {
counter-increment: testname;}
.counter1 li:before {
content: counter(testname)":";
color: #f00;
font-family: georgia,serif,sans-serif;}
.counter2 li {
counter-increment: testname2;}
.counter2 li:before {
content: counter(testname2,lower-roman)":";
color: #f00;
font-family: georgia,serif,sans-serif;}
.counter3 ol ol {
margin: 0 0 0 28px;}
.counter3 li {
padding: 2px 0;
counter-increment: testname3;}
.counter3 li:before {
content: counter(testname3,float)":";
color: #f00;
font-family: georgia,serif,sans-serif;}
.counter3 li li {
counter-increment: testname4;}
.counter3 li li:before {
content: counter(testname3,decimal)"."counter(testname4,decimal)":";}
.counter3 li li li {
counter-increment: testname5;}
.counter3 li li li:before {
content: counter(testname3,decimal)"."counter(testname4,decimal)"."counter(testname5,decimal)":";}</style></head><body><ul>
<li>
<strong>string：</strong>
<p>你的浏览器是否支持content属性：否</p>
</li>
<li>
<strong>attr：</strong>
<p title="如果你看到我则说明你目前使用的浏览器支持content属性"></p>
</li>
<li>
<strong>url()：</strong>
<p>如果你看到我的头像图片则说明你目前使用的浏览器支持content属性</p>
</li>
<li>
<strong>counter(name)：</strong>
<ol>
<li>列表项</li>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>
<strong>counter(name,list-style-type)：</strong>
<ol>
<li>列表项</li>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>
<strong>counter(name)拓展应用：</strong>
<ol>
<li>列表项
<ol>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>列表项</li>
</ol>
</li>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
</ol>
</li></ul></body></html>I believe you have read it You have mastered the methods in these cases. For more exciting information, please pay attention to other related articles on the PHP Chinese website!
CSS3’s detailed introduction to the translate attribute
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The above is the detailed content of CSS3 content attribute implementation steps. For more information, please follow other related articles on the PHP Chinese website!
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