I haven't tried modifying the preferredContentMode in the callback. At least, modifying the preferredContentMode when initializing the webview doesn't seem to work

Modifying the preferredContentMode when initially creating a webview doesn't seem to work. I temporarily solved this problem by modifying UA to the iPhone identifier.

Modifying the preferredContentMode when initially creating a webview doesn't seem to work. I temporarily solved this problem by modifying UA to the iPhone identifier.

Modifying the preferredContentMode when initially creating a webview doesn't seem to work. So I temporarily solved this problem by modifying the UA method based on the device type.