ขยายกระสุนอยู่เชื่อมโยงเมื่อเมาส์ชี้อยู่

.open-link::before {
      content: '•';
      position: relative;
      display: inline-block;
      width: 10px;
      transition: width .3s;
      margin-right: 10px;
    }
.open-link:hover::before {
      content: '• • •';
      width: 30px;
 }

<a class="open-link" href="#">Link</a>

.open-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}
.open-link::before {
    content: '• • •';
    overflow: hidden;
    width: 10px;
    position: relative;
    display: inline-block;
    transition: all 0.3s ease;
    margin-right: 10px;
    white-space: nowrap;
}
.open-link:hover::before {
    width: 50px;
}

<a class="open-link" href="#">Link</a>