Somewhere around 2019, each document loaded from file:// became its own origin in Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1500453 (I didn't check when this happened in Chromium)
replyRelated WHATWG discussion: https://github.com/whatwg/html/issues/3099
Yeah, but that's fine, the document is .html, and it can load ./app.js or ./style.css just fine even if loaded by file:// (as long as it isn't initiated by JS itself, then Origin starts to matter a lot more), otherwise basically every single local HTML file would suddenly be broken, I don't think anyone would have accepted that even with the origin changes.
replyReact and Angular are completely broken through file://
replyI don't know about Angular but React works perfectly fine through file://. I'd think the bundler/packager matter more than whar JS libraries you use, you sure you're not actually thinking of something else not handling file:// properly?
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