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Re:SingleFile: Save a complete web page into a single HTML file by chefandy on Wednesday March 02, 2022 @04:01PM (#30533084)
WARC is also used by the Webrecorder project. They made an app called Wabac which does entirely client-side WARC or HAR replays using service workers and it seems to have pretty good browser support, but I haven't really dug into the specifics.

https://github.com/webrecorder/wabac.js-1.0

Re:SingleFile: Save a complete web page into a single HTML file by wabarc on Thursday March 03, 2022 @07:33AM (#30540086)
There is a project that uses a headless browser to implement HAR.

https://github.com/wabarc/screenshot