为什么`overflow:hidden`阻止`position:sticky`工作?

问题描述：

在以下代码段中，在容器内放置了一个粘性div.它一直粘贴在滚动面板的顶部，而始终保持在其容器内.这与iOS上UITableView标头的行为相同，在标头中，直到下一个标头位于顶部为止，这些标头保持可见.

In the following snippet, there is a sticky div positioned inside a container. It sticks to the top of the scrolling panel while staying inside its container all the time. This is the same behavior as that of the UITableView headers on iOS, where the headers stay visible until the next header is at the top.

在第二个片段中，除了容器具有overflow:hidden CSS规则之外，其他所有内容都相同.这似乎阻止了position:sticky行为正常运行.

In the second snippet, everything is the same except that the container has an overflow:hidden CSS rule. This seems to prevent the position:sticky behavior from working correctly.

.parent {
  position: relative;
  background: #ccc;
  width: 500px;
  height: 150px;
  overflow: auto;
  margin-bottom: 20px;
}

.hidden-overflow {
  overflow: hidden;
}

.sticky {
  position: sticky;
  background: #333;
  text-align: center;
  color: #fff;
  top: 10px;
}

<div class="parent">
  <div>
    <div class="sticky">
      Hi, I am a sticky inside the container which contains the first paragraph.
    </div>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus volutpat sed metus et porttitor. Integer bibendum lacus eget massa ultricies fermentum. Donec cursus magna eu congue posuere. Sed eget ligula quam. Sed laoreet enim sapien, eget volutpat nisl pellentesque vel. Nulla id dolor sed dolor sodales tristique. Curabitur feugiat massa sed massa bibendum semper et ac orci. In imperdiet nibh quis iaculis viverra. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque vestibulum, nunc non volutpat tristique, nisl nisi volutpat nibh, quis pulvinar purus ex nec justo. Sed a cursus turpis. Quisque nulla odio, lacinia quis vestibulum sit amet, elementum laoreet nisi. Etiam aliquet ligula sagittis,
    consectetur ipsum sit amet, sodales augue.
    </p>
  </div>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus volutpat sed metus et porttitor. Integer bibendum lacus eget massa ultricies fermentum. Donec cursus magna eu congue posuere. Sed eget ligula quam. Sed laoreet enim sapien, eget volutpat
    nisl pellentesque vel. Nulla id dolor sed dolor sodales tristique. Curabitur feugiat massa sed massa bibendum semper et ac orci. In imperdiet nibh quis iaculis viverra. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos
    himenaeos. Quisque vestibulum, nunc non volutpat tristique, nisl nisi volutpat nibh, quis pulvinar purus ex nec justo. Sed a cursus turpis. Quisque nulla odio, lacinia quis vestibulum sit amet, elementum laoreet nisi. Etiam aliquet ligula sagittis,
    consectetur ipsum sit amet, sodales augue.
  </p>
  <p>
    Integer congue augue a quam tincidunt, vitae dictum sem iaculis. Proin feugiat nibh vitae leo facilisis, eget laoreet augue dictum. Nunc facilisis tempor feugiat. Aenean eget interdum diam. Maecenas non risus iaculis, scelerisque ipsum eu, facilisis urna.
    Integer velit justo, vestibulum vel vulputate vel, bibendum eu lorem. Phasellus viverra nisl a mi pretium eleifend.
  </p>
</div>
<div class="parent">
  <div class="hidden-overflow">
    <div class="sticky">
      Hi, I am another sticky in the container which contains the first paragraph, but my container has overflow:hidden.
    </div>
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus volutpat sed metus et porttitor. Integer bibendum lacus eget massa ultricies fermentum. Donec cursus magna eu congue posuere. Sed eget ligula quam. Sed laoreet enim sapien, eget volutpat nisl pellentesque vel. Nulla id dolor sed dolor sodales tristique. Curabitur feugiat massa sed massa bibendum semper et ac orci. In imperdiet nibh quis iaculis viverra. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque vestibulum, nunc non volutpat tristique, nisl nisi volutpat nibh, quis pulvinar purus ex nec justo. Sed a cursus turpis. Quisque nulla odio, lacinia quis vestibulum sit amet, elementum laoreet nisi. Etiam aliquet ligula sagittis,
    consectetur ipsum sit amet, sodales augue.
    </p>
  </div>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus volutpat sed metus et porttitor. Integer bibendum lacus eget massa ultricies fermentum. Donec cursus magna eu congue posuere. Sed eget ligula quam. Sed laoreet enim sapien, eget volutpat
    nisl pellentesque vel. Nulla id dolor sed dolor sodales tristique. Curabitur feugiat massa sed massa bibendum semper et ac orci. In imperdiet nibh quis iaculis viverra. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos
    himenaeos. Quisque vestibulum, nunc non volutpat tristique, nisl nisi volutpat nibh, quis pulvinar purus ex nec justo. Sed a cursus turpis. Quisque nulla odio, lacinia quis vestibulum sit amet, elementum laoreet nisi. Etiam aliquet ligula sagittis,
    consectetur ipsum sit amet, sodales augue.
  </p>
  <p>
    Integer congue augue a quam tincidunt, vitae dictum sem iaculis. Proin feugiat nibh vitae leo facilisis, eget laoreet augue dictum. Nunc facilisis tempor feugiat. Aenean eget interdum diam. Maecenas non risus iaculis, scelerisque ipsum eu, facilisis urna.
    Integer velit justo, vestibulum vel vulputate vel, bibendum eu lorem. Phasellus viverra nisl a mi pretium eleifend.
  </p>
</div>

_{(摘录自@Daniel的这里)}

为什么position:sticky在带有overflow:hidden的容器中不起作用?

Why doesn't position:sticky work in a container with overflow:hidden?

答

overflow: hidden不会阻止position: sticky工作.但是，如果您在粘滞元素的任何祖先上将overflow设置为hidden，则此祖先元素将是您的粘滞元素的滚动容器.如果将祖先上的overflow值从hidden切换到scroll并滚动该祖先(而不是窗口)，则可以看到粘滞仍在起作用.

overflow: hidden is not preventing position: sticky from working. But if you set overflow to hidden on any ancestor of your sticky element, then this ancestor element will be the scrolling container for your sticky element. If you switch the overflow value on your ancestor from hidden to scroll and scroll this ancestor (not the window), then you can see that sticky is still working.

另请参见 https://github.com/wilddeer/stickyfill#pro-tips:

溢出，溢出-x或在任何先前元素上的溢价y都会使粘滞锚定到该前任的溢出上下文.简单来说，滚动前者会导致粘滞物粘住，滚动窗口将不会.溢出:自动和溢出:滚动，但通常会导致问题和溢出混淆:隐藏.

Any non-default value (not visible) for overflow, overflow-x, or overflow-y on any of the predecessor elements anchors the sticky to the overflow context of that predecessor. Simply speaking, scrolling the predecessor will cause the sticky to stick, scrolling the window will not. This is expected with overflow: auto and overflow: scroll, but often causes problems and confusion with overflow: hidden.

或 http://www.coreyford.name/files/position-sticky-演示文稿/:

该框的位置取决于其包含的块(按位置:静态)及其滚动容器(由同一文档中最接近的祖先，其计算值为除可见"以外的"overflow-x"或"overflow-y"，或者视口，如果没有这样的祖先.

The box's position depends on its containing block (established as for position:static) as well as its scrolling container, defined by the nearest ancestor in the same document with a computed value for 'overflow-x' or 'overflow-y' other than 'visible', or the viewport if no such ancestor exists.

或者 CSS定位版式模块3级 W3C工作草案:

Or the CSS Positioned Layout Module Level 3 W3C Working Draft:

粘性放置的盒子的位置与相对位置相似定位框，但偏移量是参考带有滚动框的最近祖先；如果没有祖先，则为视口有一个滚动框.

A stickily positioned box is positioned similarly to a relatively positioned box, but the offset is computed with reference to the nearest ancestor with a scrolling box, or the viewport if no ancestor has a scrolling box.

为什么`overflow:hidden`阻止`position:sticky`工作?

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