inline-formatting/text-align.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>text-align</title>

    <style>
      body {
        font: 1.2em Helvetica, Arial, sans-serif;
        margin: 20px;
        padding: 0;
      }

      textarea {
        font-family: monospace;
        display: block;
        margin-bottom: 10px;
        background-color: #f4f7f8;
        border: none;
        border-left: 6px solid #558abb;
        color: #4d4e53;
        width: 90%;
        max-width: 700px;
        padding: 10px 10px 0px;
        font-size: 90%;
      }

      textarea:nth-of-type(1) {
        height: 120px;
      }

      textarea:nth-of-type(2) {
        height: 160px;
      }

      .playable-buttons {
        text-align: right;
        width: 90%;
        max-width: 700px;
        padding: 5px 10px 5px 26px;
        font-size: 100%;
      }

      section {
        width: 90%;
        max-width: 700px;
        border: 1px solid #4d4e53;
        border-radius: 2px;
        padding: 10px 14px 10px 10px;
        margin-bottom: 10px;
      }

      section input {
        display: block;
        margin: 5px;
      }

      .example {
        border: 5px solid black;
        margin: 20px;
        inline-size: 400px;
      }

      .horizontal {
        writing-mode: horizontal-tb;
      }

      .vertical {
        writing-mode: vertical-rl;
      }
    </style>

    <style class="editable">
      .example {
        text-align: center;
      }
    </style>
  </head>

  <body>
    <section>
      <div class="example horizontal">
        One Two Three
      </div>

      <div class="example vertical">
        One Two Three
      </div>
    </section>
    <textarea class="playable-css">.example {
  text-align: center;
}</textarea>

    <textarea id="code" class="playable-html"><div class="example horizontal">
  One Two Three
</div>

<div class="example vertical">
  One Two Three
</div></textarea>
    <div class="playable-buttons">
      <input id="reset" type="button" value="Reset" />
    </div>
  </body>
  <script>
    var section = document.querySelector("section");
    var editable = document.querySelector(".editable");
    var textareaHTML = document.querySelector(".playable-html");
    var textareaCSS = document.querySelector(".playable-css");
    var reset = document.getElementById("reset");
    var htmlCode = textareaHTML.value;
    var cssCode = textareaCSS.value;

    function fillCode() {
      editable.innerHTML = textareaCSS.value;
      section.innerHTML = textareaHTML.value;
    }

    reset.addEventListener("click", function() {
      textareaHTML.value = htmlCode;
      textareaCSS.value = cssCode;
      fillCode();
    });

    textareaHTML.addEventListener("input", fillCode);
    textareaCSS.addEventListener("input", fillCode);
    window.addEventListener("load", fillCode);
  </script>
</html>