motsu0

<input type="text" id="copy-text" value="これをコピーさせる"> <button id="bt-copy">copy</button>

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<button id="bt-prac">長押しでアラート</button>
<p id="op-prac">.</p>

<script src="path/to/long-press.js"></script>

motsu0

.loop-area{
  width: 240px;
  margin: 0 auto;
  font-size: 0;
  letter-spacing: 0;
  line-height: 0;
  overflow: hidden;
}
.loop-box{
  width: 480px;

motsu0

#sample-img{
  display: block;
  width: 60%;
  margin: 0 auto;
}
#canvas{
  display: block;
  width: 30%;
  margin: 0 auto;
}

motsu0

.a4-page{
  padding: 0 50px;
}
.a4-page+.a4-page{
  border-top: 1px solid #333;
}
.page-title{
  margin: 20px 0;
  text-align: center;
  font-size: 1.2rem;

motsu0

#game-area{
  position: relative;
}
#play-area{
  padding: 15px 0;
  position: relative;
  user-select: none;
}
#play-area,#controller{
  background-color: #43A047;

motsu0

.bt-area{
  text-align: center;
  margin: 30px auto;
}
.bt1,.bt2-outer{
  display: inline-block;
  vertical-align: bottom;
  margin: 20px;
}
.bt1{

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@media print{
  body,article.kiji{
    padding: 0;
    margin: 0;
  }
  .not-print{
    display: none;
  }
  .a4-page{
    box-sizing: border-box;

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//空配列生成
let arr = [];
let arr = new Array();
//任意長の配列生成
let arr = new Array(INT);
//一次元配列のコピー
let copy = arr.slice();
let copy = arr.concat();
//多次元配列のコピー
let copy = JSON.parse(JSON.stringify(arr));

motsu0

<p id="output-1"></p>
<p><button id="bt-1">画像読み込み開始</button></p>