Why is the Twitter Bootstrap grid not 960px?

Question

css

Actually the question is in the title. Why does bootstrap use a grid not 960 pixels , but incomprehensible 940?
And one more thing: the documentation talks about a standard grid of 12 columns, and immediately below is an example in which there are nine of these columns ! Am I missing something?

Answer 1

960, 940 - what's the difference?
Nine columns because all the content is in block #9, and navigation on the left is in block #3.

Answer 2

1) the number of columns, as well as their size, you can safely change.

Answer 3

There are 12 columns, because span1..span12. And the grid is 940 because it's actually 960, just 10+10 left+right padding :)

Answer 4

TheMengzor, Here is a screenshot for you where it is written about the default grid of 940 pixels with 9 columns

Answer 5

It is written above ... In your own example ... Standard 12 columns - 940 pixels ... For example, 767 pixels.