CSS Transparent Border Problem In Firefox 4?

2020-02-25 06:53发布

站内问答 / HTML/CSS
710 2 5

I'm trying to create a pure CSS triangle for a tooltip. All browsers looks fine except for the latest Firefox 4. Here's the code:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Untitled Document</title>
<style>
.arrow {
    border:50px solid;
    border-color:#eee transparent transparent transparent;
    display:block;
    height:0;
    width:0;
    top:50%;
    right:50%;
    position:absolute;
}
</style>
</head>
<body>
<div style="border:1px solid #000; height:400px; width:400px; margin:50px auto; position:relative;">
    <span class="arrow"></span>
</div>
</body>
</html>

Firefox 4 Screenshot:

Firefox 4 screenshot

Other Browsers Screenshot:

enter image description here

As you can see in Firefox 4, it has something like a border. Is it a Firefox bug or this is really the behavior?

How can I achieve a pure CSS triangle without that visible border in FF4? Also, I need the other 3 colors to be transparent because this triangle will overlap some elements.

2条回答
我只想做你的唯一
2楼-- · 2020-02-25 07:37

Okay I could see the problem, and found out that if you change the border style to "outset" if will be fixed in FF4, and works in IE9 too.

That would give you something like this:

.arrow {
     border:50px outset transparent ;
     border-top:#eee 50px solid;
     display:block;
     height:0;
     width:0;
     top:50%;
     right:50%;
     position:absolute;
}

PS. I'm on Vista with the newest firefox stable.

Here is the jsFiddle: http://jsfiddle.net/UFSpd/1/

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等我变得足够好
3楼-- · 2020-02-25 07:46

if transparent is not work for you then use rgba may be that's work.

Write:

.arrow {
    border-color:#eee rgba(255,255,255,0)  rgba(255,255,255,0)  rgba(255,255,255,0);
}
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