Using a formula (an + b). n starts at 0 and b is an offset value. - HTML CSS CSS Selector

HTML CSS examples for CSS Selector:nth-child

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Introduction

The following code selects p elements whose index is a multiple of 3:

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
p:nth-child(3n+0) {
    background: red;
}
</style><!--  www.  ja  v  a2 s.  c  om-->
</head>
<body>

<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<p>The fourth paragraph.</p>
<p>The fifth paragraph.</p>
<p>The sixth paragraph.</p>
<p>The seventh paragraph.</p>
<p>The eight paragraph.</p>
<p>The ninth paragraph.</p>

</body>
</html>

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