<img/>标记悬停上的触发工具提示

Question

我尝试在<img>代码上使用CSS添加工具提示，但我无法正常使用。

以下是工具提示与<a href> </a>标记一起使用但尝试将其应用于<img>标记的示例

http://jsfiddle.net/ronluna/6sgLagrr

如何在悬停<img>

时触发显示工具提示

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/* Base styles for the element that has a tooltip */
img,
[data-tooltip],
.tooltip {
  position: relative;
  cursor: pointer;
}

/* Base styles for the entire tooltip */
img:before,
img:after,
[data-tooltip]:before,
[data-tooltip]:after,
.tooltip:before,
.tooltip:after {
  position: absolute;
  visibility: hidden;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  -webkit-transition: 
	  opacity 0.2s ease-in-out,
		visibility 0.2s ease-in-out,
		-webkit-transform 0.2s cubic-bezier(0.71, 1.7, 0.77, 1.24);
	-moz-transition:    
		opacity 0.2s ease-in-out,
		visibility 0.2s ease-in-out,
		-moz-transform 0.2s cubic-bezier(0.71, 1.7, 0.77, 1.24);
	transition:         
		opacity 0.2s ease-in-out,
		visibility 0.2s ease-in-out,
		transform 0.2s cubic-bezier(0.71, 1.7, 0.77, 1.24);
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform:    translate3d(0, 0, 0);
  transform:         translate3d(0, 0, 0);
  pointer-events: none;
}

/* Show the entire tooltip on hover and focus */
img:hover:before,
img:hover:after,
img:focus:before,
img:focus:after,
[data-tooltip]:hover:before,
[data-tooltip]:hover:after,
[data-tooltip]:focus:before,
[data-tooltip]:focus:after,
.tooltip:hover:before,
.tooltip:hover:after,
.tooltip:focus:before,
.tooltip:focus:after {
  visibility: visible;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}

/* Base styles for the tooltip's directional arrow */
img:before,
.tooltip:before,
[data-tooltip]:before {
  z-index: 1001;
  border: 6px solid transparent;
  background: transparent;
  content: "";
}

/* Base styles for the tooltip's content area */
img:after,
.tooltip:after,
[data-tooltip]:after {
  z-index: 1000;
  padding: 8px;
  width: 160px;
  background-color: #000;
  background-color: hsla(0, 0%, 20%, 0.9);
  color: #fff;
  content: attr(data-tooltip);
  font-size: 14px;
  line-height: 1.2;
  text-align: center;
}

/* Directions */

/* Top (default) */
[data-tooltip]:before,
[data-tooltip]:after,
img:before,
img:after,
.tooltip:before,
.tooltip:after,
.tooltip-top:before,
.tooltip-top:after {
  bottom: 100%;
  left: 50%;
}

[data-tooltip]:before,
.tooltip:before,
img:before,
.tooltip-top:before {
  margin-left: -6px;
  margin-bottom: -12px;
  border-top-color: #000;
  border-top-color: hsla(0, 0%, 20%, 0.9);
}

/* Horizontally align top/bottom tooltips */
[data-tooltip]:after,
.tooltip:after,
img:after,
.tooltip-top:after {
  margin-left: -80px;
}

[data-tooltip]:hover:before,
[data-tooltip]:hover:after,
[data-tooltip]:focus:before,
[data-tooltip]:focus:after,
img:hover:before,
img:hover:after,
img:focus:before,
img:focus:after,
.tooltip:hover:before,
.tooltip:hover:after,
.tooltip:focus:before,
.tooltip:focus:after,
.tooltip-top:hover:before,
.tooltip-top:hover:after,
.tooltip-top:focus:before,
.tooltip-top:focus:after {
  -webkit-transform: translateY(-12px);
  -moz-transform:    translateY(-12px);
  transform:         translateY(-12px); 
}

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<br>
<br>
<a href="#" data-tooltip="This is a test">Test1</a>
<a href="#" class="tooltip" data-tooltip="THIS IS A TEST">Test2</a>

<img src="http://ctrlable.com/site/wp-content/uploads/2015/03/ctrlable_logo_white_cyan.png" class="tooltip" data-tooltip="THIS IS A TEST">
		

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Answer 1

图片是一个自我结束标记，因此您无法在内容之前或之后添加。将其包裹在一个范围内并在那里添加工具提示。

P.S其他自闭标签例如是输入，hr，br