Synchronize with file instead of with editor?

[allefeld]

Proposed feature: Instead of synchronizing with a running editor, synchronize with a file, including edits made to that file in some editor. Optimally it should be possible to associate a specific textarea / webpage with a specific path.

Background: I often have to edit HTML in tiny textareas on different parts of the same website. To deal with that, I create files in a folder which I edit with VS Code, but I have to constantly copy and paste between the local file and the textarea. Moreover, the site tends to meddle with the code, so I keep the file as a backup.