有很多网站都会使用时间轴动画，其好处就是就是可以直观展示时间线以及美化网站，那么时间轴动画效果是如何实现的呢？下面分享一个CSS3实现时间轴动画的实例，效果图如下，感兴趣的朋友就继续往下看吧。

       实现效果

       html

<h2>CSS3 Timeline</h2>
<p>Please set the $vertical variable to false to see the horizontal version.</p>
<ul id='timeline'>
  <li class='work'>
    <input class='radio' id='work5' name='works' type='radio' checked>
    <div class="relative">
      <label for='work5'>Lorem ipsum dolor sit amet</label>
      <span class='date'>12 May 2013</span>
      <span class='circle'></span>
    </div>
    <div class='content'>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio ea necessitatibus 

quo velit natus cupiditate qui alias possimus ab praesentium nostrum quidem obcaecati nesciunt!

 Molestiae officiis voluptate excepturi rem veritatis eum aliquam qui laborum non ipsam ullam 

tempore reprehenderit illum eligendi cumque mollitia temporibus! Natus dicta qui est optio rerum.
      </p>
    </div>
  </li>
  <li class='work'>
    <input class='radio' id='work4' name='works' type='radio'>
    <div class="relative">
      <label for='work4'>Lorem ipsum dolor sit amet</label>
      <span class='date'>11 May 2013</span>
      <span class='circle'></span>
    </div>
    <div class='content'>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio ea necessitatibus

 quo velit natus cupiditate qui alias possimus ab praesentium nostrum quidem obcaecati nesciunt!

 Molestiae officiis voluptate excepturi rem veritatis eum aliquam qui laborum non ipsam ullam

 tempore reprehenderit illum eligendi cumque mollitia temporibus! Natus dicta qui est optio rerum.
      </p>
    </div>
  </li>
  <li class='work'>
    <input class='radio' id='work3' name='works' type='radio'>
    <div class="relative">
      <label for='work3'>Lorem ipsum dolor sit amet</label>
      <span class='date'>10 May 2013</span>
      <span class='circle'></span>
    </div>
    <div class='content'>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio ea necessitatibus quo

 velit natus cupiditate qui alias possimus ab praesentium nostrum quidem obcaecati nesciunt! 

Molestiae officiis voluptate excepturi rem veritatis eum aliquam qui laborum non ipsam ullam

 tempore reprehenderit illum eligendi cumque mollitia temporibus! Natus dicta qui est optio rerum.
      </p>
    </div>
  </li>
  <li class='work'>
    <input class='radio' id='work2' name='works' type='radio'>
    <div class="relative">
      <label for='work2'>Lorem ipsum dolor sit amet</label>
      <span class='date'>09 May 2013</span>
      <span class='circle'></span>
    </div>
    <div class='content'>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio ea necessitatibus quo 

velit natus cupiditate qui alias possimus ab praesentium nostrum quidem obcaecati nesciunt!

 Molestiae officiis voluptate excepturi rem veritatis eum aliquam qui laborum non ipsam ullam

 tempore reprehenderit illum eligendi cumque mollitia temporibus! Natus dicta qui est optio rerum.
      </p>
    </div>
  </li>
  <li class='work'>
    <input class='radio' id='work1' name='works' type='radio'>
    <div class="relative">
      <label for='work1'>Lorem ipsum dolor sit amet</label>
      <span class='date'>08 May 2013</span>
      <span class='circle'></span>
    </div>
    <div class='content'>
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Odio ea necessitatibus quo

 velit natus cupiditate qui alias possimus ab praesentium nostrum quidem obcaecati nesciunt! 

Molestiae officiis voluptate excepturi rem veritatis eum aliquam qui laborum non ipsam ullam

 tempore reprehenderit illum eligendi cumque mollitia temporibus! Natus dicta qui est optio rerum.
      </p>
    </div>
  </li>
</ul>

css

/* -------------------------------------
 * For horizontal version, set the
 * $vertical variable to false
 * ------------------------------------- */
/* -------------------------------------
 * General Style
 * ------------------------------------- */
@import url(https://fonts.googleapis.com/css?family=Noto+Sans);
body {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
  font-size: 100%;
  font-family: "Noto Sans", sans-serif;
  color: #eee9dc;
  background: #48b379;
}

h2 {
  margin: 3em 0 0 0;
  font-size: 1.5em;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* -------------------------------------
 * timeline
 * ------------------------------------- */
#timeline {
  list-style: none;
  margin: 50px 0 30px 120px;
  padding-left: 30px;
  border-left: 8px solid #eee9dc;
}
#timeline li {
  margin: 40px 0;
  position: relative;
}
#timeline p {
  margin: 0 0 15px;
}

.date {
  margin-top: -10px;
  top: 50%;
  left: -158px;
  font-size: 0.95em;
  line-height: 20px;
  position: absolute;
}

.circle {
  margin-top: -10px;
  top: 50%;
  left: -44px;
  width: 10px;
  height: 10px;
  background: #48b379;
  border: 5px solid #eee9dc;
  border-radius: 50%;
  display: block;
  position: absolute;
}

.content {
  max-height: 20px;
  padding: 50px 20px 0;
  border-color: transparent;
  border-width: 2px;
  border-style: solid;
  border-radius: 0.5em;
  position: relative;
}
.content:before, .content:after {
  content: "";
  width: 0;
  height: 0;
  border: solid transparent;
  position: absolute;
  pointer-events: none;
  right: 100%;
}
.content:before {
  border-right-color: inherit;
  border-width: 20px;
  top: 50%;
  margin-top: -20px;
}
.content:after {
  border-right-color: #48b379;
  border-width: 17px;
  top: 50%;
  margin-top: -17px;
}
.content p {
  max-height: 0;
  color: transparent;
  text-align: justify;
  word-break: break-word;
  hyphens: auto;
  overflow: hidden;
}

label {
  font-size: 1.3em;
  position: absolute;
  z-index: 100;
  cursor: pointer;
  top: 20px;
  transition: transform 0.2s linear;
}

.radio {
  display: none;
}

.radio:checked + .relative label {
  cursor: auto;
  transform: translateX(42px);
}
.radio:checked + .relative .circle {
  background: #f98262;
}
.radio:checked ~ .content {
  max-height: 180px;
  border-color: #eee9dc;
  margin-right: 20px;
  transform: translateX(20px);
  transition: max-height 0.4s linear, border-color 0.5s linear, transform 0.2s linear;
}
.radio:checked ~ .content p {
  max-height: 200px;
  color: #eee9dc;
  transition: color 0.3s linear 0.3s;
}

/* -------------------------------------
 * mobile phones (vertical version only)
 * ------------------------------------- */
@media screen and (max-width: 767px) {
  #timeline {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
  }
  #timeline li {
    margin: 50px 0;
  }

  label {
    width: 85%;
    font-size: 1.1em;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    display: block;
    transform: translateX(18px);
  }

  .content {
    padding-top: 45px;
    border-color: #eee9dc;
  }
  .content:before, .content:after {
    border: solid transparent;
    bottom: 100%;
  }
  .content:before {
    border-bottom-color: inherit;
    border-width: 17px;
    top: -16px;
    left: 50px;
    margin-left: -17px;
  }
  .content:after {
    border-bottom-color: #48b379;
    border-width: 20px;
    top: -20px;
    left: 50px;
    margin-left: -20px;
  }
  .content p {
    font-size: 0.9em;
    line-height: 1.4;
  }

  .circle, .date {
    display: none;
  }
}

       以上就是关于CSS3实现时间轴动画的介绍，有需要的朋友可以参考一下上述代码，希望文本对大家学习有帮助，更多MongoDB片键内容大家可以继续关注其他文章。

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