Markdown Prettifier plugin instructions: Install dependancies npm

Apologies for a basic question. The Markdown Prettifier plugin instructions state that there is a dependancy that requires npm 1 to be installed. Could I have some guidance around this please?

You can install from within Obsidian without installing anything additional. Just install and activate.

npm ins only required if you want to compile the plug-in yourself - not required.

What behavior should a user expect after installing/activating within Obsidian, as you’ve said? I’ve done so and can’t discern any difference from before. Using MacOS.