How to make a html css js editor

<html>
  <head>
    <title>HTML CSS JS Editor v5.0.3</title>
	<h4>HTML CSS JS Editor</h4>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
	  <link rel="icon" type="image/x-icon" href="C:\Users\Administrator\Pictures\favicon.ico">

    <link rel="stylesheet" href="style.css" />
	<link rel="stylesheet" href="backround.css" />
  </head>

  <body>
    <textarea id="html" placeholder="HyperText Markup Langauge"></textarea>
    <textarea id="css" placeholder="Casading Style Sheets"></textarea>
    <textarea id="js" placeholder="JavaScript"></textarea>
    <iframe id="code"></iframe>
    <!--These are some compile code and a text.-->

    <script type="text/javascript" src="app.js"></script>
	<p>Hedgesoft HTML CSS JS Editor is a free source HTML CSS JS Editor website that you can create a web, if you want to save, please press enter. Credits to me. Created by me and all codes by VS Code.</p>
  </body>
</html>

How to make a html css js editor

h4 {
	color: rgb(255, 255, 255);
	font-family: Arial, Consolas
    text-align: center;
}
textarea {
  width: 50%;
  float: top;
  min-height: 250px;
  overflow: scroll;
  margin: auto;
  display: inline-block;
  background: #f4f4f9;
  outline: none;
  font-family: Consolas;
  font-size: 17px;
}

iframe {
  bottom: 0;
  position: relative;
  width: 100%;
  height: 35em;
}

How to make a html css js editor

function compile() {
  var html = document.getElementById("html");
  var css = document.getElementById("css");
  var js = document.getElementById("js");
  var code = document.getElementById("code").contentWindow.document;

  document.body.onkeyup = function() {
    code.open();
    code.writeln(
      html.value +
        "<style>" +
        css.value +
        "</style>" +
        "<script>" +
        js.value +
        "</script>"
    );
    code.close();
  };
}

compile();

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