CSS Tips - Class or ID

CSS – Class or ID?

It’s an old one but we still get asked –

People are often confused by class and id in CSS. The simple rule is id is for a CSS rule used only once and class is used for a css rule that is required more than once.

(Remember in CSS a class statement always starts with . and id starts with #)


Use an id for elements that are used once and only once on a page


1 <div id=”content”></div>

The CSS:

1 #content {background: #fff}


Use a class for elements that may be reused on the page


1 <p class=”large-text”>
2 </p>

The CSS:

1 .large-text {font-size: 1.4em}
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