col-xs- not working in Bootstrap 4

Question

I have not encountered this before  and I am having a very hard time trying to find the solution  When having a column equal to medium in bootstrap like so    lt h1 class  text-center  gt Hello  world  lt  h1 gt      lt div class  container  gt         lt div class  row  gt             lt div class  col-md-12 text-center  gt                 lt h1 gt vicki williams lt  h1 gt             lt  div gt         lt  div gt     lt  div gt    The text-align works fine    But when making the column equal to extra small like so     lt div class  container  gt         lt div class  row  gt             lt div class  col-xs-12 text-center  gt                 lt h1 gt vicki williams lt  h1 gt             lt  div gt         lt  div gt     lt  div gt    Then the text-align no longer works    Is there some bootstrap concept that I am not understanding or is this in fact a error like I think it is  I have never had this issue  as my text always has aligned in the past with xs  Any help would be greatly appreciated  Here is my complete code    lt  DOCTYPE html gt   lt html lang  en  gt     lt head gt       lt  -- Required meta tags -- gt       lt meta charset  utf-8  gt       lt meta name  viewport  content  width device-width  initial-scale 1  shrink-to-fit no  gt        lt  -- Bootstrap CSS -- gt       lt link rel  stylesheet  href  https   maxcdn bootstrapcdn com bootstrap 4 0 0-alpha 6 css bootstrap min css  integrity  sha384-rwoIResjU2yc3z8GV NPeZWAv56rSmLldC3R AZzGRnGxQQKnKkoFVhFQhNUwEyJ  crossorigin  anonymous  gt     lt  head gt     lt body gt       lt h1 class  text-center  gt Hello  world  lt  h1 gt          lt div class  container  gt             lt div class  row  gt                 lt div class  col-xs-12 text-center  gt                     lt h1 gt vicki williams lt  h1 gt                 lt  div gt             lt  div gt         lt  div gt        lt  -- jQuery first  then Tether  then Bootstrap JS  -- gt       lt script src  https   code jquery com jquery-3 1 1 slim min js  integrity  sha384-A7FZj7v d sdmMqp nOQwliLvUsJfDHW k9Omg a EheAdgtzNs3hpfag6Ed950n  crossorigin  anonymous  gt  lt  script gt       lt script src  https   cdnjs cloudflare com ajax libs tether 1 4 0 js tether min js  integrity  sha384-DztdAPBWPRXSA 3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb  crossorigin  anonymous  gt  lt  script gt       lt script src  https   maxcdn bootstrapcdn com bootstrap 4 0 0-alpha 6 js bootstrap min js  integrity  sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk 02D9phzyeVkE jo0ieGizqPLForn  crossorigin  anonymous  gt  lt  script gt     lt  body gt   lt  html gt

User · Answer

I just wondered  why col-xs-6 did not work for me but then I found the answer in the Bootstrap 4 documentation  The class prefix for extra small devices is now col- while in the previous versions it was col-xs   https   getbootstrap com docs 4 1 layout grid  grid-options  Bootstrap 4 dropped all col-xs-  classes  so use col-  instead  For example col-xs-6 replaced by col-6

User · Answer

you could do this  if you want to use the old syntax  or don t want to rewrite every template    for  i from 1 through  grid-columns      include media-breakpoint-up xs         col-xs-   i           include make-col-ready           include make-col  i

User · Answer

col-xs-  have been dropped in Bootstrap 4 in favor of col-     Replace col-xs-12 with col-12 and it will work as expected   Also note col-xs-offset- n  were replaced by offset- n  in v4

User · Answer

If you want to apply an extra small class in Bootstrap 4 you need to use col-  important thing to know is that col-xs- is dropped in Bootstrap4

User · Answer

They dropped XS because Bootstrap is considered a mobile-first development tool  It s default is considered xs and so doesn t need to be defined

User · Answer

In Bootstrap 4 3  col-xs- value  is replaced by col- value   There is no change in sm  md  lg  xl remains the same     col- value   col-sm- value    col-md- value    col-lg- value    col-xl- value

[html] `col-xs-*` not working in Bootstrap 4

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