What is this strange div in Google-Chrome?

If I go on any page, with the latest version of google chrome and open Developer tools, there is this strange div that is the first element of the <bo开发者_运维技巧dy> in all HTML pages:

<div style="position: fixed; top: 0px; left: 0px; height: 0px; width: 0px; z-index: 9999999; ">
    <div style="position: fixed; top: 100%; height: 0px; ">
        <div style="position: relative; ">
        </div>
    </div>
</div>

It is there on every page I browse to, including this page on Stack Overflow. I'm wondering if anyone else sees this, or knows why it's there?

I think you must be running some extension that's adding it. I don't see that with the latest Chrome at my end (without extensions installed).

Might be part of some extension you are using with Chrome? I don't see it either. Try disabling your extensions one by one to find out which one is injecting that code.

Extensions may modify the source code of webpages before loading, so, yeah, it probably is one you have installed.