html - 在没有绝对定位的情况下创建具有正面/背面的卡片脚蹼

Question

我想向我的网站添加一项新功能，该功能使用来自 David Walsh 网站的 card-flipper 模式:https://davidwalsh.name/css-flip .问题是，我的卡片中的内容是可变的，所以高度是未知的(而且它也是一个响应式网站)。我的页面底部有一个页脚，它需要位于该区域下方，但由于这种方法依赖于绝对定位，因此页脚将位于顶部，如代码笔中所示:https://codepen.io/anon/pen/ALJmGZ

谁能想出任何 css hack 或对这种方法的更改，从而使卡片不必绝对定位？

HTML:

<div class="flip-container" ontouchstart="this.classList.toggle('hover');">
  <div class="flipper">
    <div class="front">
      <span class="name">David Walsh</span>
    </div>
    <div class="back">
      <div class="back-logo"></div>
      <div class="back-title">@davidwalshblog</div>
      <p>Mozilla Web Developer, MooTools & jQuery Consultant, MooTools Core Developer, Javascript Fanatic, CSS Tinkerer, PHP Hacker, and web lover.</p>
    </div>
  </div>
  <footer>Here is my footer</footer>
</div>

CSS:

.flip-container {
  -webkit-perspective: 1000;
  -moz-perspective: 1000;
  -o-perspective: 1000;
  perspective: 1000;

    border: 1px solid #ccc;
}

    .flip-container:hover .flipper,  
  .flip-container.hover .flipper {
        -webkit-transform: rotateY(180deg);
        -moz-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
        transform: rotateY(180deg);
    }

.flip-container, .front, .back {
    width: 320px;
    height: 427px;
}

.flipper {
    -webkit-transition: 0.6s;
    -webkit-transform-style: preserve-3d;

    -moz-transition: 0.6s;
    -moz-transform-style: preserve-3d;

  -o-transition: 0.6s;
    -o-transform-style: preserve-3d;

    transition: 0.6s;
    transform-style: preserve-3d;

    position: relative;
}

.front, .back {
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
  -o-backface-visibility: hidden;
    backface-visibility: hidden;

    position: absolute;
    top: 0;
    left: 0;
}

.front {
    background: url(http://davidwalsh.name/demo/dwflip.jpg) 0 0 no-repeat;
    z-index: 2;
}

.back {
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
  -o-transform: rotateY(180deg);
    transform: rotateY(180deg);

    background: #f8f8f8;
}

.front .name {
    font-size: 2em;
    display: inline-block;
    background: rgba(33, 33, 33, 0.9);
    color: #f8f8f8;
    font-family: Courier;
    padding: 5px 10px;
    border-radius: 5px;
    bottom: 60px;
    left: 25%;
    position: absolute;
    text-shadow: 0.1em 0.1em 0.05em #333;

    -webkit-transform: rotate(-20deg);
    -moz-transform: rotate(-20deg);
  -o-transform: rotate(-20deg);
    transform: rotate(-20deg);
}

.back-logo {
    position: absolute;
    top: 40px;
    left: 90px;
    width: 160px;
    height: 117px;
    background: url(http://davidwalsh.name/demo/logo.png) 0 0 no-repeat;
}

.back-title {
    font-weight: bold;
    color: #00304a;
    position: absolute;
    top: 180px;
    left: 0;
    right: 0;
    text-align: center;
    text-shadow: 0.1em 0.1em 0.05em #acd7e5;
    font-family: Courier;
    font-size: 2em;
}

.back p {
    position: absolute;
    bottom: 40px;
    left: 0;
    right: 0;
    text-align: center;
    padding: 0 20px;
  font-family: arial;
  line-height: 2em;
}

footer {
  background:red;
}

Answer 1

我找到了一种使用纯 CSS 而不使用绝对位置来完成此操作的方法。我使用了 css 动画而不是过渡，你可以在 50% 关键帧将元素的高度/宽度设置为 0。查看 fiddle :https://codepen.io/anon/pen/bwmkAo

萨斯:

@keyframes no-show {
    0% {
        transform: rotateY(0deg);
    height: auto;
    width: 100%;
    }

    49% {
        height: auto;
        width: 100%;
    }

    50% {
        height: 0;
        width: 0;
    }

    100% {
        transform: rotateY(180deg);
        height: 0;
        width: 0;
    }
}

@keyframes show {
    0% {
        transform: rotateY(-180deg);
        height: 0;
        width: 0;
    }

    49% {
        height: 0;
        width: 0;
    }

    50% {
        height: auto;
        width: 100%;
    }

    100% {
        transform: rotateY(0deg);
        height: auto;
        width: 100%;
    }
}

.flip-container {
    border: 1px solid #ccc;
}

.flip-container, .front, .back {
    width: 320px;
}

.flipper {
    position: relative;
}

.front, .back {
  position: relative;
    perspective: 1000px;

    transform-style: preserve-3d;
    perspective-origin: top center;
    animation-duration: 2s;
    animation-timing-function: linear;
    transition-property: transform;
    animation-fill-mode: forwards;
    -webkit-animation-fill-mode: forwards;
    overflow: hidden;
}

.front {
    z-index: 2;

    transform: rotateY(0deg);
    animation-name: show;
    .flipper.active & {
        animation-name: no-show;
    }

  .inner {
    height: 300px;
    background: green;
  }
}

.back {
    transform: rotateY(-180deg);
    animation-name: no-show;

    .flipper.active & {
        animation-name: show;
    }

  .inner {
    height: 400px;
    background: blue;
  }
}

footer {
    background: red;
}