Problem using element.addEventListener

When I add an event listener to an element, for example this way textInput.element.addEventListener('focus', onInputFocus), listeners previously assigned to the object (textInput in the example) are removed.

Reproduce the issue from the example using textInput.element.addEventListener('focus', onInputFocus), then trace how listeners assigned to textInput and its element are registered. Confirm the behavior when the element listener is added and verify that previously assigned listeners remain available afterward.

Written by the indexing model from the issue text.