Why can't I get Node's LSP support inside a script tag in an HTML file?

[SetsuikiHyoryu]

If it's my own defined function, I can get LSP support for it, but elements in Node.js don't receive LSP support.

And I know that the Node.js LSP works when I import the script as an external file, but I don't want to make things complicated when I want to do some simple HTML/CSS/JS examples.