How to open Javadoc JAR file in web browser
- Rename the file magiclib-better-dev-1.20.6-neoforge-0.3.27-beta-javadoc.jar to magiclib-better-dev-1.20.6-neoforge-0.3.27-beta-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder magiclib-better-dev-1.20.6-neoforge-0.3.27-beta-javadoc
- Double click index.html will open the index page on your default web browser.
How to generate Javadoc from a source JAR?
Running the command javadoc:
javadoc --ignore-source-errors -encoding UTF-8 -sourcepath "magiclib-better-dev-1.20.6-neoforge-0.3.27-beta-sources.jar" -d "magiclib-better-dev-1.20.6-neoforge-0.3.27-beta-javadoc" -subpackages 
