What holds more weight in CSS: an ID or a class declaration?

In this example, I am using both an ID (#mybox) and a class (.box), but they are both being styled the same. The background color is set through the ID selector. Although I understand the basic difference between an ID and a class, in this specific scenario where both are being used together, it seems like the styling is only affecting the element with the ID. This begs the question, what is the actual difference between working with an ID vs a class, and which one takes precedence in this case?

<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<style>
    #mybox{background-color: red;} 
    .box{background-color:yellow;}
</style>
</head>
<body>
    <div id="mybox" class="box">
        boxes block
    </div>
</body>
</html>

Answer №1

The concept of CSS Specificity is key in web design.

IDs hold significantly more weight in specificity compared to classes.

To delve deeper into this topic, check out the following resources: https://web.dev/learn/css/specificity/
For a more interactive experience, visit

Answer №2

ID emerges victorious. The class will only take precedence with the !important declaration.

#mybox{background-color: red;} 
.box{background-color:yellow !important;}
/* yellow */

Reminder: @owenizedd wisely advised against using !important whenever possible.

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