What is the reason for this only functioning with the "!important" declaration?

Can anyone help me troubleshoot this code? It seems to only work with the !important rule, which I prefer not to use. I believe there must be a way to achieve the desired outcome without relying on it.

What's intriguing is that the CSS line in question comes after all the other styles (which should normally take precedence and override previous declarations).

Check out the live demo here on jsFiddle.

Here is the HTML Structure:

<div id="body">
    <div class="box">
        <p>...</p>
    </div>
    <p>...</p>
</div>

And here is the CSS Code:

#body{
    padding:18px 35px;
}

#body p{
    margin-bottom:18px;
}

.box{
    background:#ddd;
    border:1px solid #000;
    padding:5px;
}

.box p{
    margin:0;/*works with !important*/
}

Answer №1

The reason is that the ID of #body p takes precedence as a more specific selector compared to the class of .box p. This importance simply overrides the cascade effect.

Answer №2

When matching the tag p with #body, it has a higher specificity compared to matching p with .box. For more information on specificity, you can refer to the specificity section of the CSS spec. It is recommended to try the following code snippet:

#header .box p { margin: 0; }

Note that the space between #header and .box plays a crucial role in the selection.

Answer №3

The specificity value of your #body p is higher. For further information on how specificity values are computed, you can refer to this link.

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