"cannot modify browser selection behavior"

Why am I getting this error message when exporting an OAM?

Opera 12.10 "Cannot modify browser selection behavior" for multiple elements - border, message, button, etc.

it's a compatibility-warning that says: "Opera 12.1 will not support some techniques that you've used in your doc"

actual Operaversion should 15 or 16, don't know exactly ... so 12 is quite outdated

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