2

我正在使用padding-top将 div 的纵横比强制为 16:9。div 的内容是绝对定位并扩展以填充 div。

HTML：

<div class = "ratio-16-9">
  <p>This p element is in a div with an aspect ratio of 16:9.</p>
</div>

CSS：

.ratio-16-9 {
  padding-top:56.25% /* Yields 16:9 aspect ratio. */;
  position:relative;
}

.ratio-16-9 > p {
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:100%;
}

它可以很好地实现纵横比，但是由于某种原因，div 溢出了我的 CSS Grid 容器。

这是一个解决问题的工作示例：https ://jsfiddle.net/uo63yyer/30/

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  width: 100%;
}

body {
  background-color: #404040;
  min-height: 100%;
  width: 100%;
}

p {
  color: #f0f0f0;
  text-align: center;
}

#content {
  display: grid;
  grid-template-columns: auto;
  grid-template-rows: auto auto auto auto;
}

.topic {
  background-color: #808080;
  min-height: 100px;
  margin: 8px;
  padding: 8px;
}

.ratio-16-9 {
  background-color: #0080f0;
  padding-top: 56.25%;
  /* If you comment out the line above and uncomment the line below, things work propperly, but the aspect ratio is not maintained. */
  /*height:300px;*/
  position: relative;
}

.ratio-16-9>p {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
<div id="content">

  <div class="topic">
    <div class="ratio-16-9">
      <p>This p element is in a div with an aspect ratio of 16:9.</p>
    </div>
  </div>

  <div class="topic">
  </div>

  <div class="topic">
  </div>

  <div class="topic">
    <div>
      <!-- Uncomment the line below and things work propperly. -->
      <!--<p>This p element is in a propperly sized div and it works as one might expect it to.</p>-->
    </div>
  </div>

</div>

4

1 回答 1

2

问题似乎是用于auto调整网格列的大小：

#content {
  display:grid;
  grid-template-columns: auto;
  grid-template-rows: auto auto auto auto;
}

百分比填充是根据包含块 ( spec )的宽度计算的。

无论出于何种原因，auto浏览器都会为此目的忽略该值。

如果您从单位切换auto到fr单位，则布局将按预期工作。

#content {
  display:grid;
  grid-template-columns: 1fr;
  grid-template-rows:auto auto auto auto;
}


* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  width: 100%;
}

body {
  background-color: #404040;
  min-height: 100%;
  width: 100%;
}

p {
  color: #f0f0f0;
  text-align: center;
}

#content {
  display: grid;
  /* grid-template-columns:auto; */
  grid-template-columns: 1fr;
  grid-template-rows: auto auto auto auto;
}

.topic {
  background-color: #808080;
  min-height: 100px;
  margin: 8px;
  padding: 8px;
}

.ratio-16-9 {
  background-color: #0080f0;
  padding-top: 56.25%;
  /* If you comment out the line above and uncomment the line below, things work propperly, but the aspect ratio is not maintained. */
  /*height:300px;*/
  position: relative;
}

.ratio-16-9>p {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
<div id="content">
  <div class="topic">
    <div class="ratio-16-9">
      <p>This p element is in a div with an aspect ratio of 16:9.</p>
    </div>
  </div>
  <div class="topic"></div>
  <div class="topic"></div>
  <div class="topic">
    <div>
      <!-- Uncomment the line below and things work propperly. -->
      <!--<p>This p element is in a propperly sized div and it works as one might expect it to.</p>-->
    </div>
  </div>
</div>

https://jsfiddle.net/uo63yyer/31/

此外，请注意，在网格项目上使用基于百分比的填充可能会在不同浏览器中呈现不同的效果。Firefox 中忽略网格项的百分比填充

于 2017-05-17T02:34:41.017 回答