I have just seen that every page has length global variable.
What does this variable represent? Is it related in some way that how many iframes / frames are loaded on the page?
This will be a doctor happy to provide references. For example, the new tab page on Chrome has its value of 17 and here it is 0 on the stack overflow.
Yes, how many frames it contains (including iframe) are in the current window:
W3 specification:
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