Uncaught ReferenceError: process is not defined / how to use environment variables in HTML?

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This article talks about “ways to use environment variables at Netlify” that has some direct examples:

[Support Guide] Using environment variables on Netlify correctly

Last reviewed: August 2023 The preferred way to use environment variables in Netlify is to set them in our environment - be that in the Environment Variables settings UI (on the site’s “Build & Deploy settings” page), or via netlify.toml. You’ll want to choose the right pattern to meet your needs. Setting variables in our UI may be considered a bit more secure, since only people with access to the Netlify admin UI for your site can see them, rather than “anyone who can clone your repo!”. Thes…