如果我使用HTML5 doctype，为什么我不能将div设为100％？我怎样才能达到100％的高度

I am working on getting the layout sorted for a pretty simple gallery webapp, but when I use an HTML5 doctype declaration, the height of some of my divs (which were 100%) get shrunk right down, and I can't seem to plump them back up using CSS.

我正在努力为一个非常简单的画廊webapp排序布局，但是当我使用HTML5 doctype声明时，我的一些div（它们是100％）的高度正在缩小，我似乎无法丰满他们使用CSS备份。

My HTML is at https://dl.dropbox.com/u/16178847/eyewitness/b/index.html and css is at https://dl.dropbox.com/u/16178847/eyewitness/b/style.css

我的HTML位于https://dl.dropbox.com/u/16178847/eyewitness/b/index.html，css位于https://dl.dropbox.com/u/16178847/eyewitness/b/style.css

If I remove the HTML5 doctype declaration, all is as I want it to be, but I really want to use the proper HTML5 doctype declaration.
如果我删除HTML5 doctype声明，所有都是我想要的，但我真的想使用正确的HTML5 doctype声明。
If I set the doctype to HTML5 and make no changes, the div with the photo and the footer divs are not visible, presumably because they are 0px high.
如果我将doctype设置为HTML5并且不做任何更改，则带有照片和页脚div的div不可见，大概是因为它们是0px高。
If I set the doctype to HTML5 and make the body { height: 100px } and .container { height: 100px } or .container { height: 100% }, it becomes visible, but what I need is it to be is full height rather than a height in pixels.
如果我将doctype设置为HTML5并使body {height：100px}和.container {height：100px}或.container {height：100％}，它会变得可见，但我需要的是它是全高度而不是高于像素的高度。
If I try to do the same as above, but with the body { height: 100% } the photo and footer divs are not visible again.
如果我尝试像上面那样做，但身体{身高：100％}，照片和页脚div再次不可见。

What do I need to do to get it 100% in height so that my photo and footer divs are full height?

为了让我的照片和页脚div达到全高，我需要做些什么才能达到100％的高度？

2 个解决方案

#1

Only if the parent element has a defined height, i..e not a value of auto. If that has 100% height, the parent's parent height must be defined, too. This could go until to the html root element.

仅当父元素具有已定义的高度时，i..e才不是auto的值。如果它具有100％高度，则也必须定义父亲的父高度。这可以直到html根元素。

So set the height of the html and the body element to 100%, as well as every single ancestor element of that element that you wish to have the 100% height in the first place.

所以设置html和body元素，以100％的高度，以及您希望有摆在首位的100％高度元素的每一个祖先元素。

#2

Indeed, to make it work do as follow:

实际上，为了使其工作，请执行以下操作：

<!DOCTYPE html>
<html>
<head>
  <title>Vertical Scrolling Demo</title>
  <style>
    html, body {
      width: 100%;
      height: 100%;
      background: white;
      margin:0;
      padding:0;
    }
    .page {
      min-height: 100%;
      width: 100%;
    }
  </style>
</head>
<body>
  <div id="nav" class="page">
    <ul>
      <li><a href="#about">About</a></li>
      <li><a href="#portfolio">Portfolio</a></li>
      <li><a href="#contact">Contact</a></li>
    </ul>
  </div>
  <div id="page1" class="page">
    <h1><a name="about">about</a></h1>
    About page content goes here.
  </div>
  <div id="page2" class="page">
    <h1><a name="portfolio">portfolio</a></h1>
    Portfolio page content goes here.
  </div>
  <div id="page3" class="page">
    <h1><a name="contact">contact</a></h1>
    Contact page content goes here.
  </div>
</body>
</html>

#1