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 ...

Create a second file and for now, call it another-page.html. Add the required HTML tags and some basic content in the another-page.html file. Add a link in the index.html page to another-page.html.

This means that your first step in moving an existing HTML+JavaScript page to Blazor begins with putting your page's HTML in a .cshtml file while leaving your JavaScript in the related .html file.