Make a Single-Choice List a Multi-Choice List with JavaScript There's no way to tell just by looking at a list whether the list supports multiple or single selections. By Peter Vogel 07/09/2012 I ...

Adding a JavaScript file to a Page using Page Properties If you only want to use a JavaScript file on one page of your site, it's best to add it to one specific page using that page's Page Properties.

Always test your pages using Google’s own tools and third-party resources to view the rendered HTML to make sure all your content is showing up.