问有没有一种方法可以在元素上使用CSS3创建有角度的角？

EN

span {
  position: relative;
  display: inline-block;
  padding: 10px 20px 10px 25px;
  margin: 10px;
}
span::before, span::after {
  content: '';
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 50%;
  border: 2px solid #ddd;
  background: #eee;
  z-index: -1;
}
span::before {
  border-bottom: none;
  transform: skewX(40deg);
}
span::after {
  top: 50%;
  border-top: none;
  transform: skewX(-40deg);
}

/* second span */
span ~ span {
  font-size: 32px;
}

<span>Hello World</span>
<br>
<span>Hello World</span>

.quote {
  background: #000;
  color: #fff;
  position: relative;
  z-index: 1;
}
.q{
  background: #000;
  color: #fff;
  position: relative;
  z-index: 1;
  padding:10px;
  margin:100px;
  width:100px;
  border-right: 10px solid black;
}
.quote:after {
  background: inherit;
  bottom: -11px;
  content: '';
  display: block;
  height: 200%;
  left: -50px;
  position: absolute;
  right: -10px;
  transform: skewX(-35deg);
  transform-origin: 100%;
  z-index: -1;
}

.quote:before {
  background: inherit;
  top: -11px;
  content: '';
  display: block;
  height: 200%;
  left: -50px;
  position: absolute;
  right: -10px;
  transform: skewX(35deg);
  transform-origin: 100%;
  z-index: -1;
}

.q:after{
      background: inherit;
  bottom: 0;
  content: '';
  display: block;
  height: 50%;
  left: 10px;
  top:20px;
  position: absolute;
  right: -50px;
  transform: skewX(-35deg);
  transform-origin: 100%;
  z-index: -1;
}
.q:before{
  background: inherit;
  bottom: 0;
  content: '';
  display: block;
  height: 50%;
  left: 10px;
  top:-00px;
  position: absolute;
  right: -50px;
  transform: skewX(35deg);
  transform-origin: 100%;
  z-index: -1;
}

<div class="q">
    <span class="quote">Hello World!!</span>
</div>