Warn on `click()` or similar on disconnected element

While e.g., Selenium generates an error if you try to call `click()` on a disconnected element, the browser doesn't.

However, in a test case, this scenario is _probably_ an issue in the test case, so the error might seem like a reasonable behavior. But when the goal is to be DOM compatible, an error _is not_ a reasonable behavior.

But logging a warning is!

Start by locating the click() handling and the code that determines whether an element is connected. Review existing tests for interactions with disconnected elements, then add coverage for the requested behavior. Done means click() and similar interactions log a warning without raising an error when the element is disconnected.

Written by the indexing model from the issue text.