## Bug description

Creating a selector with an attribute isn't working at all.

`[data-attr="bla"]`

## Expected behavior

It should work

## How to reproduce

1. Create action
2. Add an attribute in the selector
3. 


## Additional context

The reason for this is that we store the attributes as `attr__data-attr` but we do not add `attr__` in the filtering. I am working on a solution.


#### *Thank you* for your bug report – we love squashing them!

posthog/test/test_event_model.py
action_watch_movie = Action.objects.create(team=self.team, name="watched movie")
        ActionStep.objects.create(action=action_watch_movie, tag_name="a", href="/movie")
        person = Person.objects.create(distinct_ids=["anonymous_user", "is_now_signed_up"], team=self.team)
        event_watched_movie_anonymous = Event.objects.create(
            distinct_id="anonymous_user", team=self.team, elements=[Element(tag_name="a", href="/movie")],
        )
        event_watched_movie = Event.objects.create(
            distinct_id="is_now_signed_up", team=self.team, elements=[Element(tag_name="a", href="/movie")],
        )
        events = Event.objects.filter_by_action(action_watch_movie)
        self.assertEqual(events[0], event_watched_movie)
        self.assertEqual(events[0].person_id, person.pk)
    def test_no_person_leakage_from_other_teams(self):
        action_watch_movie = Action.objects.create(team=self.team, name="watched movie")
        ActionStep.objects.create(action=action_watch_movie, event="user signed up")
        person = Person.objects.create(distinct_ids=["anonymous_user"], team=self.team)
        event_watched_movie_anonymous = Event.objects.create(
            event="user signed up", distinct_id="anonymous_user", team=self.team
        )
        team2 = Team.objects.create()
        person2 = Person.objects.create(distinct_ids=["anonymous_user"], team=team2)
        events = Event.objects.filter_by_action(action_watch_movie)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0].person_id, person.pk)
class TestElementGroup(BaseTest):