Still work to do. It might be a latency problem. There is only so much I can do if Apple have a policy of only nodding in the direction of compatible standards.

I have two friends with iPhones, but all they can do is prove one way or another. No debug facility even if they let me & I was aux fais with iPhones. There are websites that purport to test your website for iPhones but they rely heavily on the browser you use (in particular the <AUDIO> TAG), and the problem is with iPhone browsers not Computer Browsers per se.