CODEWITHSUNDEEP
htmlcssfirefoxmargin
Andrew Terentyev
Andrew Terentyev

Reputation: 53

Firefox body margin bug?

I have this simple example:

<header>
    <ul>
        <li>Item</li>
        <li>Item</li>
        <li>Item</li>
        <li>Item</li>
        <li class="clear"></li>
    </ul>
</header>
<section>section</section>

And this piece of css:

BODY, HTML{
    margin: 0;
}
header{
    margin-bottom: 100px; /* section goes down */
}
UL{
    list-style-type: none;
}
UL LI{
    float: left;
    background: green;
}
.clear{
    clear: both;
    float: none;
}
section{
    background: red;
}

So expect for the "header" to go straight to top-left corner, then 100px margin, then "section". In all major browsers that works as expected, but in Firefox (version 16) "header" get extra margin-top for some reason.

Is this a bug?

Here is an jsfiddle example: http://jsfiddle.net/AvZek/2/

BTW If I use clearfix instead of the "clear" class then it’s working just fine.

Upvotes: 5

Views: 4173

Answers (3)

BoltClock
BoltClock

Reputation: 723668

This is, without a doubt, a bug. The margin is definitely not supposed to be there.

  • According to Firebug, the only non-zero margin that is computed that I can see is the same margin-bottom: 100px on your header element as in your CSS. Everything else is zero.

  • Even Firebug's DOM inspector has trouble identifying it; it never highlights that region, with the obvious exception of when you're inspecting html itself (which it highlights as part of its content area).

I found tons of bug reports which were closed as duplicates of this one, with numerous more test cases. Plus, it looks like it has been around since at least Firefox 2.

Upvotes: 5

Zoltan Toth
Zoltan Toth

Reputation: 47667

Instead of polluting your code with non-semantic and unnecessary empty <li>-s just add overflow: hidden to your <ul>

HTML

<header>
    <ul>
        <li>Item</li>
        <li>Item</li>
        <li>Item</li>
        <li>Item</li>
    </ul>
</header>
<section>section</section>

CSS

ul {
    list-style-type: none;
    overflow: hidden;
}

DEMO

Upvotes: 4

Abdul Malik
Abdul Malik

Reputation: 2642

you can use {padding-bottom:100px;} instead of margin to achieve this ..

Upvotes: 0

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