[tdrdt]

Off topic but related: sometimes I see developers who track interactions without checking if analytics is available.

  onclick="trackInteraction();doInteraction()"

Because the first action gives an error the other actions is not called. This means a broken site and a user that will not return.

[ev1]

i see this so frequently it's like people don't want "worthless" visitors that don't run ads and analytics even ;)