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                <h1> Range Slider</h1>
<div class="slidecontainer">
   <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
   <p>レンジャースライダーの価値: <span id="demo"></span></p>


 .slider {
   -webkit-appearance: none;
   width: 100%;
   height: 15px;
   border-radius: 5px;
   background: #d3d3d3;
   outline: none;
   opacity: 0.7;
   -webkit-transition: .2s;
   transition: opacity .2s;
/* rangersliderのスライダーを設計します--- webkit-を使用してChrome、Opera、Safari、Edgeで実行します */
 .slider::-webkit-slider-thumb {
   -webkit-appearance: none;
   appearance: none;
   width: 25px;
   height: 25px;
   border-radius: 50%;
    background: DodgerBlue;
   cursor: pointer;
/* Firefoxでrangersliderを設計する */
 .slider::-moz-range-thumb {
   width: 25px;
   height: 25px;
   border-radius: 50%;
   background: #4CAF50;
   cursor: pointer;


                 var slider = document.getElementById("myRange");
 var output = document.getElementById("demo");
 /* デモのIDを持つスパンタグのデフォルト値50を表示する*/
 output.innerHTML = slider.value; 
/* レンジャースライダーの現在値を更新する*/
 slider.oninput = function() {
   output.innerHTML = this.value;