Pure CSS Tooltips 使用 CSS 小技巧幫按鈕加上 tooltip

/* Add this attribute to the element that needs a tooltip */

[data-tooltip] {
  position: relative;
  z-index: 2;
  cursor: pointer;
}

/* Hide the tooltip content by default */

[data-tooltip]:before,
[data-tooltip]:after {
  visibility: hidden;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
  filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  pointer-events: none;
}

/* Position tooltip above the element */

[data-tooltip]:before {
  position: absolute;
  top: 0px;
  left: 160px;
  margin-bottom: 5px;
  margin-left: -80px;
  padding: 7px;
  width: 180px;
  border-radius: 3px;
  background-color: #000;
  background-color: hsla(0, 0%, 20%, 0.9);
  color: #fff;
  content: attr(data-tooltip);
  text-align: center;
  font-size: 14px;
  line-height: 1.2;
}

/* Triangle hack to make tooltip look like a speech bubble */

[data-tooltip]:after {
  position: absolute;
  top: 5px;
  left: 75px;
  margin-left: -5px;
  width: 0;
  border-right: 10px solid #000;
  border-right: 10px solid hsla(0, 0%, 20%, 0.9);
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  content: " ";
  font-size: 0;
  line-height: 0;
}

/* Show tooltip content on hover */

[data-tooltip]:hover:before,
[data-tooltip]:hover:after {
  visibility: visible;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
  filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}