Feature request: Autocompletion in search box

[Tej12345]

Due to my laziness, I would like to have some autocompletion (choice of next words of matter of interests) related to words I looking for in a page. For example: We have a word, in a page, like chrominium and I want to get this word by typing chro and then pressing Tab and have a sequence of choices that includes chrominium in that list. Is that possible to analyze all the words on the page and then connect them to autocompletion requests?