CSS: The first-child selector is used to match the first child element in its parent element; that is, an element will be matched only if it is the first child element of its parent element.
CSS3: How to use the first-child selector?
#: The first-child selector matches the first child element within its parent element.
Syntax:
元素:first-child
{
css样式
}Example: Match the first
element of the parent element of
p:first-child
{
background-color:yellow;
}Note: All major browsers support the :first-child selector. For :first-child in IE8 and earlier browsers, must be declared.
CSS :first-child selector usage example
##Example 1:Select each and set its style for each element in which the element is the first child element of its parent element:
<!DOCTYPE html>
<html>
<head>
<style>
p:first-child i
{
background:yellow;
}
</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>
Example 2:The style selected for the first child element of each element
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
ul>:first-child
{
background:yellow;
}
</style>
</head>
<body>
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
</body>
</html>
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