You need a local html server.

Thank you for wanting to help me. But unfortunately, after your answer, I am as perplexed as before. Is there a guide on the Internet? I've been looking for a solution for several days now. All explanations found seem to refer to plug-ins or operating systems that are no longer supported. Written in German and translated with ms translator.

You need one of the aforementioned app, or similar. I'm not using it, so I can't provide more detailed solution

• https://play.google.com/store/apps/details?id=com.phlox.simpleserver
• https://play.google.com/store/apps/details?id=com.qamar.ide.web
• https://play.google.com/store/apps/details?id=slowscript.httpfileserver