time/future.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>The :future pseudo-class</title>
    <link rel="stylesheet" href="styles.css" />
    <style>
      * {
        box-sizing: border-box;
      }

      video {
        max-width: 300px;
      }
    </style>

    <style class="editable">
      :past(p, span) {
        background-color: green;
      }
    </style>
  </head>

  <body>
    <section class="preview">
      <video controls preload="metadata">
        <source src="video.mp4" type="video/mp4" />
        <source src="video.webm" type="video/webm" />
        <track
          label="English"
          kind="subtitles"
          srclang="en"
          src="subtitles.vtt"
          default
        />
      </video>
    </section>

    <textarea class="playable playable-css" style="height: 100px">
:future(p, span) {
  background-color: green;
}</textarea
    >

    <textarea class="playable playable-html" style="height: 150px">
<video controls preload="metadata">
  <source src="video.mp4" type="video/mp4" />
  <source src="video.webm" type="video/webm" />
  <track label="English" kind="subtitles" srclang="en" src="subtitles.vtt" default>
</video></textarea
    >

    <div class="playable-buttons">
      <input id="reset" type="button" value="Reset" />
    </div>
  </body>
  <script src="../playable.js"></script>
</html>