polyglot/examples/html_python.html at main · hacksu/polyglot · GitHub

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#!/usr/bin/env python3
"""<!--
# Run as Python: python3 html_python.html
# Run as browser: open html_python.html
-->
<!DOCTYPE html>
<html>
<head><title>HTML + Python Polyglot</title></head>
<body style="background:#142027;color:#35c982;font-family:monospace;padding:40px;">
  <h1>Hello from the Browser!</h1>
  <p>This file is valid HTML <em>and</em> valid Python.</p>
  <pre id="how"></pre>
  <script>
    document.getElementById('how').textContent =
      'How it works:\n' +
      '  Python: everything above print() is a triple-quoted string.\n' +
      '  HTML:   the Python code sits inside an HTML comment <!-- ... -->.';
  </script>
</body>
</html>
<!--"""

# ── Python only sees below this line ─────────────────────────
# Everything above was assigned to an unnamed string expression.
# The HTML parser never sees this Python code — it is outside
# the </html> tag, which browsers silently ignore.

print("Hello from Python!")
print()
print("How it works:")
print("  Python: everything above is a triple-quoted string expression.")
print("  HTML:   the Python code is after </html>, which browsers ignore.")
print("  Both files are 100% valid in their own parser.")

# -->