How to open Javadoc JAR file in web browser
- Rename the file scala-js-junit-tools_2.12-1.1.2.20180226041527-javadoc.jar to scala-js-junit-tools_2.12-1.1.2.20180226041527-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder scala-js-junit-tools_2.12-1.1.2.20180226041527-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 "scala-js-junit-tools_2.12-1.1.2.20180226041527-sources.jar" -d "scala-js-junit-tools_2.12-1.1.2.20180226041527-javadoc" -subpackages 
