kramdown.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Ruby.wasm Quickstart</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="browser.script.iife.js"></script>
    <style>
      .spinner {
        border: 4px solid rgba(0, 0, 0, 0.1);
        width: 40px;
        height: 40px;
        border-radius: 50%;
        border-left-color: #09f;
        animation: spin 1s ease infinite;
      }

      @keyframes spin {
        0% {
            transform: rotate(0deg);
        }
        100% {
            transform: rotate(360deg);
        }
      }
    </style>
    <script type="text/ruby">
        require 'js'
        require 'kramdown'

        div = JS.global.document.createElement("div")
        text = <<MARKDOWN
# This is markdown
This is parsed markdown

## Second heading
MARKDOWN

        div.innerHTML = Kramdown::Document.new(text).to_html
        JS.global.document.getElementById("spinner").style.display = "none"
        JS.global.document.body.appendChild(div)
  </script>
    </head>
    <body class="main">
        <h3>
          Kramdown Example
        </h3>
        <div id="spinner" class="spinner"></div>
    </body>
</html>