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This is my preferred method (now!). Also very simple to write a couple of lines of JavaScript to target P and H elements and replaces the last space with a non breaking space.

But a CSS method is very welcome!

Please do this at build time instead of shipping to clients. You'll slow down page rendering, introduce a repaint, and now require a script. Considering all browsers will be doing the exact same execution, it's needlessly wasteful.

Same thing applies to client-side syntax highlighting and LaTeX.

But that alters the content, and copy/paste would carry that forced pairing into a different line-length context.

In macOS, you can achieve this in plain text with [option]-[space]. Helpful in Markdown — although, of course, you can use ` ` in Markdown, as well.