防止fieldset元素的边框通过图例元素

I have a fieldset, how can I position the legend inside a fieldset with a border? I want the border to go around the legend and not through the middle of it.

我有一个字段集,如何将图例放在带边框的字段集中?我希望边界绕过传说,而不是通过它的中间。

JSFiddle

fieldset {
  border: 0;
  padding: 0!important;
  margin: 0;
  min-width: 0;
  border: 1px solid red;
}
legend {
  padding: 0!important;
}

<fieldset>
  <legend>Title</legend>
</fieldset>

2 个解决方案

#1

One option would be to float the legend element to the left:

一种选择是将图例元素浮动到左侧:

fieldset {
  border: 2px solid #f00;
}
legend {
  float: left;
  width: 100%;
  padding: 0;
  font-weight: bold;
}

<fieldset>
  <legend>This is a legend</legend>
  <label>Here is an input element: <input type="text" /></label>
</fieldset>

Another approach would be to use an outline rather than a border:

另一种方法是使用轮廓而不是边框:

fieldset {
  border: none;
  outline: 2px solid #f00;
}
legend {
  padding: 0.6em 0 0;
  font-weight: bold;
}

<fieldset>
  <legend>This is a legend</legend>
  <label>Here is an input element: <input type="text" /></label>
</fieldset>

Another approach would be to absolutely position the legend element relative to the parent fieldset element. This is probably the least flexible approach.

另一种方法是将图例元素相对于父字段集元素绝对定位。这可能是最不灵活的方法。

fieldset {
  border: 2px solid #f00;
  position: relative;
  padding-top: 2.6em; /* Displace the absolutely positioned legend */
}
legend {
  position: absolute;
  top: 0; left: 0;
  padding: 12px;
  font-weight: bold;
}

<fieldset>
  <legend>This is a legend</legend>
  <label>Here is an input element: <input type="text" /></label>
</fieldset>

#2

A variation on the accepted answer (using SASS) which should work in all modern browsers (IE9+)

接受答案的变体(使用SASS)应该适用于所有现代浏览器(IE9 +)

fieldset {
  > legend {
    float: left;

    + * {
      clear: both;
    }
  }
}

This will clear the next element after the float so you don't have to worry about your layout being messed up.

这将清除浮动后的下一个元素,因此您不必担心布局被搞砸了。

#1