纯CSS的ToolTip消息提示

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style.css 样式

/* START TOOLTIP STYLES */
[tooltip] {
  border-radius: 3px;
  position: relative; /* opinion 1 */
}

/* Applies to all tooltips */
[tooltip]::before,
[tooltip]::after {
  text-transform: none; /* opinion 2 */
  font-size: .9em; /* opinion 3 */
  line-height: 1;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  pointer-events: none;
  position: absolute;
  display: none;
  opacity: 0;
}
[tooltip]::before {
  content: '';
  border: 5px solid transparent; /* opinion 4 */
  z-index: 1001; /* absurdity 1 */
}
[tooltip]::after {
  content: attr(tooltip); /* magic! */
  
  /* most of the rest of this is opinion */
  font-family: 'Microsoft YaHei','Lantinghei SC','Open Sans',Arial,'Hiragino Sans GB','STHeiti','WenQuanYi Micro Hei','SimSun',sans-serif;
  text-align: center;
  
  /* 
    Let the content set the size of the tooltips 
    but this will also keep them from being obnoxious
    */
  min-width: 3em;
  max-width: 21em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 1ch 1.5ch;
  border-radius: .3ch;
  box-shadow: 0 1em 1em -.5em rgba(0, 0, 0, 0.15);
  color: #fff;
  z-index: 1000; /* absurdity 2 */
}

/* Make the tooltips respond to hover */
[tooltip]:hover::before,
[tooltip]:hover::after {
  display: block;
}

/* don't show empty tooltips */
[tooltip='']::before,
[tooltip='']::after {
  display: none !important;
}

/* FLOW: UP */
[tooltip][flow^="up"] {
  background-color: #5bc0de;
  border: 1px solid #46b8da;
}
[tooltip]:not([flow])::before,
[tooltip][flow^="up"]::before {
  bottom: 100%;
  border-bottom-width: 0;
  border-top-color: #46b8da;
}
[tooltip]:not([flow])::after,
[tooltip][flow^="up"]::after {
  background-color: #46b8da;
  bottom: calc(100% + 5px);
}
[tooltip]:not([flow])::before,
[tooltip]:not([flow])::after,
[tooltip][flow^="up"]::before,
[tooltip][flow^="up"]::after {
  left: 50%;
  -webkit-transform: translate(-50%, -.5em);
          transform: translate(-50%, -.5em);
}

/* FLOW: DOWN */
[tooltip][flow^="down"] {
  background-color: #00d46a;
  border: 1px solid #00c161;
}
[tooltip][flow^="down"]::before {
  top: 100%;
  border-top-width: 0;
  border-bottom-color: #00c161;
}
[tooltip][flow^="down"]::after {
  background-color: #00c161;
  top: calc(100% + 5px);
}
[tooltip][flow^="down"]::before,
[tooltip][flow^="down"]::after {
  left: 50%;
  -webkit-transform: translate(-50%, .5em);
          transform: translate(-50%, .5em);
}

/* FLOW: LEFT */
[tooltip][flow^="left"] {
  background-color: #ff6055;
  border: 1px solid #ff483a;
}
[tooltip][flow^="left"]::before {
  top: 50%;
  border-right-width: 0;
  border-left-color: #ff483a;
  left: calc(0em - 5px);
  -webkit-transform: translate(-.5em, -50%);
          transform: translate(-.5em, -50%);
}
[tooltip][flow^="left"]::after {
  background-color: #ff483a;
  top: 50%;
  right: calc(100% + 5px);
  -webkit-transform: translate(-.5em, -50%);
          transform: translate(-.5em, -50%);
}

/* FLOW: RIGHT */
[tooltip][flow^="right"] {
  background-color: #ffc928;
  border: 1px solid #ffc000;
}
[tooltip][flow^="right"]::before {
  top: 50%;
  border-left-width: 0;
  border-right-color: #ffc000;
  right: calc(0em - 5px);
  -webkit-transform: translate(.5em, -50%);
          transform: translate(.5em, -50%);
}
[tooltip][flow^="right"]::after {
  background-color: #ffc000;
  top: 50%;
  left: calc(100% + 5px);
  -webkit-transform: translate(.5em, -50%);
          transform: translate(.5em, -50%);
}

/* KEYFRAMES */
@-webkit-keyframes tooltips-vert {
  to {
    opacity: .9;
    -webkit-transform: translate(-50%, 0);
            transform: translate(-50%, 0);
  }
}
@keyframes tooltips-vert {
  to {
    opacity: .9;
    -webkit-transform: translate(-50%, 0);
            transform: translate(-50%, 0);
  }
}

@-webkit-keyframes tooltips-horz {
  to {
    opacity: .9;
    -webkit-transform: translate(0, -50%);
            transform: translate(0, -50%);
  }
}

@keyframes tooltips-horz {
  to {
    opacity: .9;
    -webkit-transform: translate(0, -50%);
            transform: translate(0, -50%);
  }
}

/* FX All The Things */ 
[tooltip]:not([flow]):hover::before,
[tooltip]:not([flow]):hover::after,
[tooltip][flow^="up"]:hover::before,
[tooltip][flow^="up"]:hover::after,
[tooltip][flow^="down"]:hover::before,
[tooltip][flow^="down"]:hover::after {
  -webkit-animation: tooltips-vert 300ms ease-out forwards;
          animation: tooltips-vert 300ms ease-out forwards;
}

[tooltip][flow^="left"]:hover::before,
[tooltip][flow^="left"]:hover::after,
[tooltip][flow^="right"]:hover::before,
[tooltip][flow^="right"]:hover::after {
  -webkit-animation: tooltips-horz 300ms ease-out forwards;
          animation: tooltips-horz 300ms ease-out forwards;
}

/* UNRELATED to tooltips */
body {
  margin: 0;
  min-height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  font-family:'Microsoft YaHei','Lantinghei SC','Open Sans',Arial,'Hiragino Sans GB','STHeiti','WenQuanYi Micro Hei','SimSun',sans-serif;
}
main {
  -webkit-box-flex: 1;
      -ms-flex: 1 1 100vh;
          flex: 1 1 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
aside {
  -webkit-box-flex: 0;
      -ms-flex: none;
          flex: none;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  background: #49b293;
  color: #fff;
  padding: 1em;
}
main div {
  text-align: center;
  color: #353539;
}
main span {
  padding: .5em 1em;
  margin: .5em;
  display: inline-block;
  color: #fff;
}

aside a {
  color: inherit;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
  padding: .4em 1em;
}

html：

<html>
<head>
  <meta charset="utf-8">
  <title>纯CSS的Tooltip消息提示</title>
  <link type="text/css" rel="stylesheet" href="style.css">
</head>
<body>
  <main>
    <div>
      <span tooltip="从上面滑入提示信息" flow="up">上面滑入提示</span>
    </div>
    <div>
      <span tooltip="从左侧滑入提示信息" flow="left">左侧滑入提示</span>
      <span tooltip="从右侧滑入提示信息" flow="right">右侧滑入提示</span>
    </div>
    <div>
      <span tooltip="从下面滑入提示信息" flow="down">下面滑入提示</span>
    </div>
  </main>
</body>
</html>