javascript - create and use a CSS form in <Style>, not in <Body> with HTML -

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i have learnt html , have small program.

var acc = document.getelementsbyclassname("accordion");  var i;    (i = 0; < acc.length; i++) {      acc[i].onclick = function(){          this.classlist.toggle("active");          this.nextelementsibling.classlist.toggle("show");    }  }
.triangleright {      width: 0;      height: 0;      border: solid 10px;      border-color: transparent transparent transparent green ;  }    .triangledown {      width: 0;      height: 0;      border: solid 10px;      border-color: white transparent transparent transparent ;  }    button.accordion {      background-color: rgb(213,227,233);      color: #444;      cursor: pointer;      padding: 18px;      width: 100%;      border: none;      text-align: left;      outline: none;      font-size: 15px;      transition: 0.4s;  }    button.accordion.active {      background-color: rgb(0,56,96);      color: white;  }    button.accordion:after {      /* content:"/2795"; */      content: "<div class="triangleright"></div>";      font-size: 13px;      float:left;      margin-left: 5px;  }    button.accordion.active:after {      /* content:"/2796"; */      content: "<div class="triangledown"></div>";  }    div.panel {      padding: 0 18px;      background-color: white;      max-height: 0;      overflow: hidden;      transition: 0.6s ease-in-out;      opacity: 0;  }    div.panel.show {      opacity: 1;      max-height: 500px;    }
<button class="accordion">&nbsp; &nbsp; title</button>  <div class="panel">    <p>content</p>  </div>

i need create small triange before "title". when insert triangle form have created button.accordion:after , button.accordion.active:after, not work.

you can't create html elements in content property of css, more info

alternatively can have approach, can put button in div, , in div can have absolute position element shows arrow, , can handle div same have handle nextelementsibling...

here fiddle solves issue

html: 

<div class="parent">   <div class="arrow triangleright"></div>   <button class="accordion">&nbsp; &nbsp; title</button>   <div class="panel">     <p>content</p>   </div> </div>

javascript:

var acc = document.getelementsbyclassname("accordion"); var accdiv = document.getelementsbyclassname("arrow"); var i;  (i = 0; < acc.length; i++) {   acc[i].onclick = function() {     onaccclick(this);   } }  (i = 0; < accdiv.length; i++) {   accdiv[i].onclick = function() {     onaccclick(this.nextelementsibling);   } }  function onaccclick(elem) {     elem.classlist.toggle("active");   elem.nextelementsibling.classlist.toggle("show");   elem.previouselementsibling.classlist.toggle("triangledown"); }

css:

.triangleright {   width: 0;   height: 0;   border: solid 10px;   border-color: transparent transparent transparent green; }  .triangledown {   top: 22px !important;   right: 13px !important;   width: 0;   height: 0;   border: solid 10px;   border-color: white transparent transparent transparent; } div.arrow {   cursor: pointer; } button.accordion {   background-color: rgb(213, 227, 233);   color: #444;   cursor: pointer;   padding: 18px;   width: 100%;   border: none;   text-align: left;   outline: none;   font-size: 15px;   transition: 0.4s; }  button.accordion.active {   background-color: rgb(0, 56, 96);   color: white; }  .parent {   position: relative }  div.panel {   padding: 0 18px;   background-color: white;   max-height: 0;   overflow: hidden;   transition: 0.6s ease-in-out;   opacity: 0; }  .arrow {   position: absolute;   top: 16px;   right: 10px; }  div.panel.show {   opacity: 1;   max-height: 500px; }

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