How to open Javadoc JAR file in web browser
- Rename the file kotlin-preact-signals-core-js-1.6.0-pre.737-javadoc.jar to kotlin-preact-signals-core-js-1.6.0-pre.737-javadoc.zip
- Use your favourite unzip tool (WinRAR / WinZIP) to extract it, now you have a folder kotlin-preact-signals-core-js-1.6.0-pre.737-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 "kotlin-preact-signals-core-js-1.6.0-pre.737-sources.jar" -d "kotlin-preact-signals-core-js-1.6.0-pre.737-javadoc" -subpackages 
