Google suggest/JS-based Dynamic drop-down menu

The basic principle is to create an IFRAME in the current window, and then list the prompts of related keywords in IFRAME, and click the list to put the selected items in the search box.
The number of searches for all related keywords can be listed so quickly. It seems that all the prompt words have been pre-searched and recorded in advance. I tried sex without any search prompts. It seems that the search term is strictly pornographic.
In addition, this dynamic list function is also applied to the Gmail address bar for automatic input,

 

The source code automatically completed by Google is as follows:

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