如何使块填充父窗口(不仅仅是可见窗口)的宽度

Question

当我水平滚动时，如何使块B像块A一样填充宽度？

html:

<div id="main">
  <div style="background-color:coral;">AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</div>
  <div style="background-color:lightblue;">B</div>
</div>

css：

#main div {
    display: inline-block; /*or block*/
    min-width: 100%;
    height: 50px;
}

https://jsfiddle.net/tombrito/hc9b8s06/1/

Answer 1

发生这种情况是因为块A溢出父级，而块B的宽度仅与父级一样宽。

相反，您应该使父级展开以包含块A。您可以使用实现这一点

#main {
  display: inline-block; /* (at least) as wide as contents */
  min-width: 100%; /* but grow to fill available space, if any */
}

#main {
  display: inline-block;
  min-width: 100%;
}
#main div {
  display: inline-block; /*or block*/
  min-width: 100%;
  height: 50px;
}

<div id="main">
  <div style="background-color:coral;">AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</div>
  <div style="background-color:lightblue;">B</div>
</div>