This gets very tricky when you think about JavaScript. What if you only pop up important information via an onBlur event in a dynamically created div element t

This gets very tricky when you think about JavaScript. What if you only pop up important information via an onBlur event in a dynamically created div element that is overlayed on the page, only after asynchronously querying a REST endpoint to get information from a database? How would a crawler even know that this element is shown when you leave a specific input field? How would it know to wait a second while the database is getting the data? Like it or not, we're well past the days of complete HTML documents being served for a request.