Ok, for Android I needed the Internet permission. For HTML your Module seems not unusable.
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As far as I know, on HTML5 you have to have the PHP and your MonkeyGame.html on the same domain. It's a protection measure implemented in browsers I think.
Do you mean in the same folder?
Ok, tried that. Put both in the same folder, didn't work.
Ok found out what I still needed. At the beginning of my PHP script, I needed to add this:
Now Chrome and Firefox will retrieve data in HTML5.