1 - télécharger la page courante en html - js
<a onclick="this.href='data:text/html;charset=UTF-8,'+encodeURIComponent(document.documentElement.outerHTML)" href="#" download="page.html">Download</a>
<a onclick="this.href='data:text/html;charset=UTF-8,'+encodeURIComponent(document.documentElement.outerHTML)" href="#" download="page.html">Download</a>