I have just observed that every page has length global variable.
What does this variable represent? Is it somehow related to how many iframes/frames are loaded on page?
It'd be happy if a doc reference is provided.
For example, on Chrome new tab page its value is 17 and here, on StackOverflow it is 0.
Yes, it's how many frames (including iframes) are in the current window:
https://developer.mozilla.org/en-US/docs/Web/API/Window.length
W3 specification:
http://www.w3.org/html/wg/drafts/html/master/browsers.html#accessing-other-browsing-contexts
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