CSS - Pseudo-class
CSS pseudo-classes are used to add special effects to some selectors.
The syntax of pseudo-classes:
selector:pseudo-class {property:value;}
CSS classes can also be used with pseudo-classes:
selector.class:pseudo-class {property:value;}
Links can be displayed in different ways in a CSS-supporting browser:
Example
a:link {color:#FF0000;} /* unvisited link */
a:visited {color:#00FF00;} /* visited link */
a:hover {color:#FF00FF;} /* mouse over link */
a:active {color:#0000FF;} /* selected link */
Note: a:hover MUST come after a:link and a:visited in the CSS definition in order to be effective!!
Note: a:active MUST come after a:hover in the CSS definition in order to be effective!!
Note: Pseudo-class names are not case-sensitive.
Pseudo-classes can be combined with CSS classes:
a.red:visited {color:#FF0000;}
<a class="red" href="http://leakbali.com/T-css/syntax/85/">
CSS Syntax
</a>
If the link in the example above has been visited, it will be displayed in red.
The :first-child pseudo-class matches a specified element that is the first child of another element.
Note: For :first-child to work in Internet Explorer a must be declared.
Match the first
element
In the following example, the selector matches any <p> element that is the first child of any element:
Example
<html>
<head>
<style type="text/css">
p:first-child
{
color:blue;
}
</style>
</head>
<body>
<p>I am a strong man.</p>
<p>I am a strong man.</p>
</body>
</html>
In the following example, the selector matches the first <i> element in all <p> elements:
Example
<html>
<head>
<style type="text/css">
p > i:first-child
{
font-weight:bold;
}
</style>
</head>
<body>
<p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p>
<p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p>
</body>
</html>
In the following example, the selector matches all <i> elements in <p> elements that are the first child of another element:
Example
<html>
<head>
<style type="text/css">
p:first-child i
{
color:blue;
}
</style>
</head>
<body>
<p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p>
<p>I am a <i>strong</i> man. I am a <i>strong</i> man.</p>
</body>
</html>
The :lang pseudo-class allows you to define special rules for different languages.
Note: Internet Explorer 8 (and higher) supports the :lang pseudo-class if a <!DOCTYPE> is specified.
In the example below, the :lang class defines the quotation marks for q elements with lang="no":
Example
<html>
<head>
<style type="text/css">
q:lang(no) {quotes: "~" "~";}
</style>
</head>
<body>
<p>Some text <q lang="no">A quote in a paragraph</q> Some text.</p>
</body>
</html>
Select and style an input field when it gets focus:
:focus Example
input:focus
{
background-color:yellow;
}
The :focus selector is used to select the element that has focus.
Tip: The :focus selector is allowed on elements that accept keyboard events or other user inputs.
