it works now. for explanation, it's inside a typo3-cms. the absolute path was of course the wrong way. the realtive solved the problem. i just have to edit some more things, but it's running now on all available devices. only thing to solve will be to make the canvas dynamically responsive. but not today if you like to have a short look, it's a not released page of my new pages: https://factor118.de/index.php?id=87
i'll keep you updated if i found the adjustments for responsive pages. guess ther might be also some changes needed for touch-navigation, but not that important at this moment. doin such things when tired - stange thing, need to sleep...ah, but just let me check the last edit ... ,)