How to Know Which HTML Element is Causing Vertical Scroll Bar

Question

I am learning Bootstrap. On the getting started menu, there are few templates given. I am playing with that. One example is about fixed Footer. I used nav from previous example

Answer 1

Add:

  * {
   outline: 1px solid red;
  }

Then when you scroll down you should see one really tall box. Right click on it and select inspect element. That should give you the information you need.

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UPDATE:

Here is a nifty chrome plugin that can do that for you : http://pesticide.io/