The problem is resolved: I use Windows Phone without a SIM card for development, but when I first set up the phone 1 year ago, I set up automatic synchronization of date and time. (like all)
However, without a SIM card and Wi-Fi, the phone does not synchronize the date and time, so the https certificate from google appeared as expired, and the iframe did not boot.
Setting the date and time manually solved the problem.
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