Display tooltip when container overflow is hidden

问题

Is there a way, preferably without js, to position and display a tooltip above a container, when the container must have overflow:hidden, without the tooltip be affected and clipped by the container?

Here is an example to illustrate this problem:

.container {
  overflow: hidden;
  position: relative;
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
  height: 70px;
  background: lightblue;
  text-align: center;
}
a.tooltips {
  position: relative;
  display: inline;
}
a.tooltips span {
  position: absolute;
  width: 140px;
  color: #FFFFFF;
  background: #000000;
  height: 96px;
  line-height: 96px;
  text-align: center;
  visibility: hidden;
  border-radius: 8px;
  box-shadow: 4px 3px 10px #800000;
}
a.tooltips span:after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -8px;
  width: 0;
  height: 0;
  border-bottom: 8px solid #000000;
  border-right: 8px solid transparent;
  border-left: 8px solid transparent;
}
a:hover.tooltips span {
  visibility: visible;
  opacity: 0.7;
  top: 30px;
  left: 50%;
  margin-left: -76px;
  z-index: 999;
}

<div class="container">
  
  <a class="tooltips" href="#">Hover me for Tooltip
      <span>Tooltip</span></a>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin porttitor elit neque, in condimentum ante pulvinar et. Donec et erat nulla. Vestibulum quis porta tellus. Curabitur non blandit metus. Vestibulum nec nisi quis urna tempor pharetra. Phasellus volutpat, arcu ac malesuada porttitor, erat diam facilisis ligula, eget aliquet nibh augue.
    </div>
  <div>

回答1:

There's a way to display an element in these conditions, by having it absolutely positioned (as a simple wrapper) and containing a relatively positioned tooltip.
So you need to add an element.
One important condition: the parent with overflow: hidden must not be positioned itself or the tooltip won't pop out/displayed above this parent.

Codepen (I renamed your .tooltips class as .has-tooltip and added 2 anothers)
My previous answer with a similar trick

 .container {
  overflow: hidden;
  /*position: relative;*/
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
  height: 70px;
  background: lightblue;
  text-align: center;
}
.has-tooltip {
  /*position: relative;*/
  display: inline;
}
.tooltip-wrapper {
  position: absolute;
  visibility: hidden;
}
.has-tooltip:hover .tooltip-wrapper {
  visibility: visible;
  opacity: 0.7;
  /*top: 30px;*/
  /*left: 50%;*/
  /*margin-left: -76px;*/
  /* z-index: 999; defined above with value of 5 */
}

.tooltip {
  display: block;
  position: relative;
    top: 2em;
    right: 100%;
  width: 140px;
  height: 96px;
  /*margin-left: -76px;*/
  color: #FFFFFF;
  background: #000000;
  line-height: 96px;
  text-align: center;
  border-radius: 8px;
  box-shadow: 4px 3px 10px #800000;
}
.tooltip:after {
  content: '';
  position: absolute;
    bottom: 100%;
    left: 50%;
  margin-left: -8px;
  width: 0;
  height: 0;
  border-bottom: 8px solid #000000;
  border-right: 8px solid transparent;
  border-left: 8px solid transparent;
}

<div class="container">
  
  <a class="has-tooltip" href="#">Hover me for Tooltip
      <span class="tooltip-wrapper"><span class="tooltip">Tooltip</span></span></a>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin porttitor elit neque, in condimentum ante pulvinar et. Donec et erat nulla. Vestibulum quis porta tellus. Curabitur non blandit metus. Vestibulum nec nisi quis urna tempor pharetra. Phasellus volutpat, arcu ac malesuada porttitor, erat diam facilisis ligula, eget aliquet nibh augue.
    </div>
  <div>

回答2:

now i used position absolute to fixed for the tooltip, check it now

.container {  
  position: relative;
  overflow:hidden;
  margin: auto;
  width: 50%;
  border: 3px solid green;
  padding: 10px;
  height: 70px;
  background: lightblue;
  text-align: center;
  z-index:9;
}
a.tooltips {
  position: relative;
  display: block;
}
a.tooltips span {
  position: fixed;
  width: 140px;
  color: #FFFFFF;
  background: #000000;
  height: 96px;
  line-height: 96px;
  text-align: center;
  visibility: hidden;
  border-radius: 8px;
  z-index:9999;
  top:15px;
  box-shadow: 4px 3px 10px #800000;
}
a.tooltips span:after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -8px;
  width: 0;
  height: 0;
  border-bottom: 8px solid #000000;
  border-right: 8px solid transparent;
  border-left: 8px solid transparent;
}
a:hover.tooltips span {
  visibility: visible;
  opacity: 0.7;
  top: 40px;
  left: 50%;
  margin-left: -76px;
  z-index: 999;
}

<div  style="height:500px;">
<div class="container">
  <a class="tooltips" href="#">Hover me for Tooltip
      <span>Tooltip</span></a>
  <div>
    </div>

来源：https://stackoverflow.com/questions/39146047/display-tooltip-when-container-overflow-is-hidden

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html

css

css3