css - Do nested Bootstrap 3 rows need to be within a col-sm-*? -

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do nested bootstrap 3 rows need within col-sm-* or can nested within col-md-, col-xs-, etc?

the documentation says col-sm-* doesn't appear explicit whether nesting within other col sizes forbidden.

http://getbootstrap.com/css/#grid-nesting

you can use class in same time. on base bootstrap decide 1 best screen.

you can nasted class inside of types - it's depend need.


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