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dabblet.css

.hoge {
  border: 1px solid #666;
  width: 100px;
  height: 100px;
  background-color: #ccc;
  -webkit-transition: 0.3s ease-out;
  transform: scaleY(1);
}

.hoge:hover {
  transform: scaleY(0);
  height: 0;
}

dabblet.html

<div>aaa</div>
<div class="hoge">hoge</div>
<div>aaa</div>

settings.json

{"view":"split-vertical","seethrough":"","prefixfree":"1","page":"all"}