Firefox adds margin on the wrong element
Question
Today I came across this code. It works as I would expect in Chrome, but it is adding a margin on a wrong element with Firefox:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Site Title</title>
<style type="text/css" media="screen">
body {
background-color: #aaa;
margin: 0;
}
#header {
background-color: #fff;
}
#logo {
float: left;
}
#menu {
float: right;
}
.container {
width: 960px;
margin: 0 auto;
}
.main {
margin-top: 36px;
}
.clear {
clear: both;
}
</style>
</head>
<body>
<div id="header">
<div class="container">
<div id="logo">Logo</div>
<div id="menu">Home</div>
<div class="clear"></div>
</div>
</div>
<div class="container main">
Content
</div>
</body>
</html>
Firefox seems to add the margin in the .main rule to the content div, which was expected, and to the header div too.
If I add some text inside the header it would work as expected and the header won't have that margin:
<div id="header"> Some text here
<div class="container">
<div id="logo">Logo</div>
<div id="menu">Home</div>
<div class="clear"></div>
</div>
</div>
</div>
I can also add some text after the header block and it would also do the trick for Firefox.
I can't figure out why is Firefox adding that margin to the header element.
2 answers
solution1
0 2013-09-19 08:05:58
Very strange problem, I don't see why this happens.
It however seems to help when you add a padding of at least 1px to .container .
Also check this demo .
solution2
0 2013-09-19 08:23:30
The problem has something to do with the container with automatic height and floating children...
Adding display:inline-block; to the #header will make it works in every browser (well except old IE), will include in the white box the right-floated div too (that now is not), and will continue to adjust the height automatically.
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