html - Flexbox/Grid 取决于子百分比高度（Firefox/Edge）

Question

我一直在尝试从表格布局切换到更现代的布局。我有一个需要“固定”页眉和粘性页脚的布局。为了实现它，我决定稍微改变页面的工作方式，而不是让整个页面滚动，而是创建了一个滚动 div 作为正文/页脚区域。这使标题保持在顶部并具有动态高度，同时模仿典型页面的滚动方式。

但是，我在 flexbox 和 grid 中都遇到了同样的问题。只要我没有任何基于百分比的子元素，我的布局就可以正常工作。如果有的话，似乎弹性框会根据孩子调整大小。例如，如果其中一个子级中的 div 的高度设置为 100%，它将显示该 div，但溢出后的任何其他内容和页脚显得不合适。这对我来说似乎有点违反直觉，我希望有人能解释它背后的设计选择？是否有任何解决方法可以允许这种功能？

我基本上认为 flexbox 系统将允许填充剩余空间（用于身体），但也可以根据需要扩展以包含所有孩子。

我写了一个快速示例来展示我在说什么。见下文，谢谢！

编辑：这似乎只发生在 Firefox 和 Edge，而不是 Chrome。

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

.container {
  display: inline-block;
  height: 100%;
  width: 50%;
  max-height: 100%;
  overflow: auto;
}

.bg {
  background-color: gray;
}

.span {
  width: 100%;
  height: 100%;
}

.flex {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.flex > .main {
  flex: 1;
}

<div class="container">
  <div class="flex">
    <div class="main">
      <ul>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
      </ul>
    </div>
    <footer>
      This should be a sticky footer
    </footer>
  </div>
</div><div class="container">
  <div class="flex">
    <div class="main">
      <div class="bg span">
        This breaks the page
      </div>
      <ul>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
        <li>This is a spacer</li>
      </ul>
    </div>
    <footer>
      This should be a sticky footer
    </footer>
  </div>
</div>

标签： htmlcssflexboxgrid