Definition
The HTML Permission Elements defines InPagePermissionMixinBlockerReason
enum InPagePermissionMixinBlockerReason {
// No blocker reason.
"",
// Blocker reasons supported by all InPagePermissionMixin users.
"illegal_subframe", "unsuccesful_registration",
"recently_attached", "intersection_changed",
"intersection_out_of_viewport_or_clipped",
"intersection_occluded_or_distorted", "style_invalid",
// Blocker reason specific to HTMLPermissionElement.
"type_invalid",
};