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What could cause a CSS error (?) To occur in Firefox?

I came across this unusual Firefox - the only one (as far as I know - I only tested Safari and Chrome and used Firefox 3.6). The CSS error was at work today and managed to reproduce the problem with a much smaller piece of code, here:

<!DOCTYPE html>
<head>
    <style>
    /*
     * A small snippet of some CSS resets code from html5doctor and YUI fonts and resets
     * added just to make sure it not from weird browser padding/margin. Still happens
     * if this is removed though
     */
    html, body, div, span, p, ul, li {
        margin: 0;
        padding: 0;
        border: 0;
        outline: 0;
        font-size: 100%;
        background: transparent;
    }

    body {
        line-height: 1;
    }

    li {
        list-style: none;
    }

    body {
        color: #333;
        font-family: Helvetica, Arial, Verdana, Geneva, sans-serif;
        line-height: 1.3;
    }

    /* Some clearfix code from HTML5 Boilerplate */
    .clearfix:before, .clearfix:after {
        content: "\0020";
        display: block;
        height: 0;
        visibility: hidden;
    }

    .clearfix:after {
        clear: both;
    }

    .clearfix {
        zoom: 1;
    }
    </style>
</head>
<body>
    <div style="padding: 20px; border: solid thin black;">Hello!</div>
    <div>
        <ul class="clearfix">
            <li style="float: left; padding: 5px; border: solid thin black;">There</li>
            <li style="float: left; padding: 5px; border: solid thin black;">should</li>
            <li style="float: left; padding: 5px; border: solid thin black;">be no</li>
            <li style="float: left; padding: 5px; border: solid thin black;">margin</li>
            <li style="float: left; padding: 5px; border: solid thin black;">above</li>
            <li style="float: left; padding: 5px; border: solid thin black;">this</li>
            <li style="float: left; padding: 5px; border: solid thin black;">list</li>
        </ul>
        <p style="margin-top: 30px">Yet for some reason the 30px margin-top on this p applies to both this p as well as the above list</p>
    </div>
</body>
</html>

Here is a screenshot that the problem looks like screenshot

, , , <div> s <ul> , , , Firebug . - 30px <p> <p>, <div>. , - clearfix ( , <br/>, ), , - , . !

+3
3

, clearfix; -)

:

.clearfix:before,
.clearfix:after {
  content: ".";    
  display: block;    
  height: 0;    
  overflow: hidden; 
}
.clearfix:after {clear: both;}
.clearfix {zoom: 1;}

: http://www.yuiblog.com/blog/2010/09/27/clearfix-reloaded-overflowhidden-demystified/

+6

- , , Firefox, 3,6-6 (). : {content: ""} '( ) ! , Firefox .

:

<div class="container cf">
    <div class="floater"></div>
</div>
<div class="next">
    <p>Some content here!</p>
</div>

<style>
body { padding: 0; margin: 0; }
.cf:after { content:""; display:block; clear:both; *zoom:1; }
.container { background:gray; }
.floater { float:left; width:46%; height:200px; margin:0 10px; background:#ddd; }
.next { background: yellow; margin: 30px 0px; }
</style>

http://jsfiddle.net/TjW6c/394/

+2

You are not using clearfix right. Using positioniseverything clearfix (aka Pie-clearfix) is usually my solution for all clearfixes:

.clearfix:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}

You can check it here: http://jsfiddle.net/WVtYd/

+1
source

Source: https://habr.com/ru/post/1794054/

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