how to crop html page, not image

I need to select a part of html page and **get coordinates of selection**, not image - i want to realize this like image cropping (square selection area), how can i do it? in more detail i want next: in browser on html page i'm click button, then all page are disabled and become darkgrey color, but small window is showing in real page color, i can manipulate this window: make it larger or smaller - in result i'm need coordinates of this window.
we need a lot more info. are you trying to crop in the browser? Client site? What is the end result you are looking for?

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