How does bootstrap collapse columns at a certain viewport width using only css? -


how bootstrap change applying col-sm-* col-xs-* when viewport width passes boundary (if width>768, apply sm, else apply xs).

<div class="container">     <div class="row">         <!-- navigation -->         <div class="col-sm-2 col-xs-12">             <ul class="nav nav-pills nav-stacked">                 <li><a href="">manage projects</a></li>                 <li><a href="">billing</a></li>                 <li><a href="">account settings</a></li>             </ul>         </div>         <!-- view -->         <div class="col-sm-10 col-xs-12">             view         </div>     </div> </div>

in bootstrap.css, see if @media(min-width>768) sets col-sm-* width's , float-left, see col-xs-* should ignored.
in particular, see if window getting bigger, how setting col-sm-* might override col-xs-* (maybe qwirk of browsers - last attribute applied 1 rendered), if window getting smaller, col-sm-* never told not applied, if makes sense.

as pointed out in comments, bootstrap designed "mobile first" means styled first mobile screens, , additional styles added in screen gets larger. done through use of css media queries, using min-width conditions.

these min-width media queries add styles within them page once browser exceeds minimum width. additionally, getting @ in question, css in fact use last style applied, when same style applied more once (this assumes both styles have same selector weighting, that's whole separate topic)

with these 2 things in mind, if inspect column elements, see when browser large, col-xs-* class getting applied, being overridden col-sm-* class. because class's order in css comes after other one, giving priority. however, once browser's width drops below point, media query removes styles page, allowing col-xs-* class regain it's precedence.

let me know if you'd me explain more in-depth, , i'll see can do.


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