I'm having same scenario where the onError does not catch the autoplay policy error. + 1 for this.

Thanks, sorry for the late follow-up on this - I am going to look at having SM2 return the promise the browser gives you when auto-play type stuff is blocked, so you know that things didn't work and then can hook off of that.

The best thing is not to try to auto-play at all, and then if for whatever reason things are blocked, you can give the user a notice to tap or click something in order to attempt playback again.

I like the idea of firing onerror() here too, but there are times when that method can be fired during playback and I want to prototype and tinker with the onerror() approach vs. a new method, or something else entirely for the "playback blocked" case.

In the meantime you can convert the error in a warning from outside the plugin without touch the code and with the ensure that not any call of the play function will ended in an error. You need to add something like that before you load the plugin or directly after that. What this is doing is injecting code in all the instances of the html5 Audio class, to catch the error and prevent the propagation of it to the console:

(function (window, document, _undefined) {
    "use strict";
    if ((typeof window.Audio !== "undefined") && window.Audio) {
        Audio = (function(Audio) {
            return function(url) {
                var aud = new Audio(url);//...arguments
                aud._original_play = aud.play;
                aud.play = function() {       // overwrite method
                    var promise = this._original_play();
                    if ((promise !== undefined) && promise.catch) {
                        promise['catch'](function(error) {
                            // Autoplay was prevented.
                            // Show a "Play" button so that user can start playback.
                        });
                    }
                    return promise;
                };
                return aud;
            }
        }(Audio));
    }
})(window, document);