将宽度/高度设置为减去像素的百分比 [英] Setting width/height as percentage minus pixels

问题描述

我试图创建一些可重用的CSS类，以提高网站的一致性和混乱度，而且我坚持尝试标准化我经常使用的一件事.

I'm trying to create some re-usable CSS classes for more consistency and less clutter on my site, and I'm stuck on trying to standardize one thing I use frequently.

我有一个容器< div> ，我不想为其设置高度(因为它会根据其所在位置的不同而有所不同)，并且在其中是一个标头< div> ，然后是无序列表，所有项目均已应用CSS.

I have a container <div> that I don't want to set the height for (because it will vary depending on where on the site it is), and inside it is a header <div>, and then an unordered list of items, all with CSS applied to them.

看起来很像这样:

我希望无序列表占用容器< div> 中的剩余空间，因为知道标题< div> 高 18px .我只是不知道如何将列表的高度指定为" 100％减去 18px 的结果".

I want the unordered list to take up the remaining room in the container <div>, knowing that the header <div> is 18px tall. I just don't know how to specify the list's height as "the result of 100% minus 18px".

我已经在SO的其他几个上下文中看到了这个问题，但是我认为有必要再次询问我的特殊情况.在这种情况下，有人对您有任何建议吗?

I've seen this question asked in a couple other contexts on SO, but I thought it would be worth asking again for my particular case. Does anyone have any advice in this situation?

推荐答案

您可以使用 calc :

height: calc(100% - 18px);

请注意，某些旧的浏览器不支持CSS3 calc()函数，因此可能需要实现该功能的供应商特定版本:

Note that some old browsers don't support the CSS3 calc() function, so implementing the vendor-specific versions of the function may be required:

/* Firefox */
height: -moz-calc(100% - 18px);
/* WebKit */
height: -webkit-calc(100% - 18px);
/* Opera */
height: -o-calc(100% - 18px);
/* Standard */
height: calc(100% - 18px);

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