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[element-internals-behaviors.tentative.html]
[behaviors returns empty array when no behaviors configured]
expected: FAIL
[behaviors is a read-only frozen array]
expected: FAIL
[behaviors array cannot be modified after attachment]
expected: FAIL
[attachInternals throws TypeError for duplicate behavior instance]
expected: FAIL
[attachInternals throws TypeError for multiple instances of same behavior type]
expected: FAIL
[attachInternals throws TypeError when behavior is already attached to another element]
expected: FAIL
[attachInternals throws TypeError for string in behaviors array]
expected: FAIL
[attachInternals throws TypeError for null in behaviors array]
expected: FAIL
[attachInternals throws TypeError for undefined in behaviors array]
expected: FAIL
[attachInternals throws TypeError for plain object in behaviors array]
expected: FAIL
[attachInternals throws TypeError for number in behaviors array]
expected: FAIL
[attachInternals throws TypeError for DOM element in behaviors array]
expected: FAIL
[Behavior state is preserved across disconnect and reconnect]
expected: FAIL
[HTMLSubmitButtonBehavior cannot be subclassed]
expected: FAIL