What is the difference among col-lg- col-md- and col-sm- in Bootstrap

Question

What is the difference among col-lg-    col-md-  and col-sm-  in Twitter Bootstrap

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From Twitter Bootstrap documentation    small grid    768px     col-sm-   medium grid    992px     col-md-   large grid    1200px     col-lg-

User · Answer

I think the confusing aspect of this is the fact that BootStrap 3 is a mobile first responsive system and fails to explain how this affects the col-xx-n hierarchy in that part of the Bootstrap documentation   This makes you wonder what happens on smaller devices if you choose a value for larger devices and makes you wonder if there is a need to specify multiple values   You don t   I would attempt to clarify this by stating that    Lower grain types  xs  sm  attempt retain layout appearance on smaller screens and larger types  md lg  will display correctly only on larger screens but will wrap columns on smaller devices   The values quoted in previous examples refer to the threshold as which bootstrap degrades the appearance to fit the available screen estate   What this means in practice is that if you make the columns col-xs-n then they will retain correct appearance even on very small screens  until the window drops to a size that is so restrictive that the page cannot be displayed correctly   This should mean that devices that have a width of 768px or less should show your table as you designed it rather than in degraded  single or wrapped column form    Obviously this still depends on the content of the columns and that s the whole point  If the page attempts to display multiple columns of large data  side by side on a small screen then the columns will naturally wrap in a horrible way if you did not account for it  Therefore  depending on the data within the columns you can decide the point at which the layout is sacificed to display the content adequately   e g  If your page contains three col-sm-n columns bootstrap would wrap the columns into rows when the page width drops below 992px   This means that the data is still visible but will require vertical scrolling to view it  If you do not want your layout to degrade  choose xs  as long as your data can be adequately displayed on a lower resolution device in three columns   If the horizontal position of the data is important then you should try to choose lower granularity values to retain the visual nature  If the position is less important but the page must be visible on all devices then a higher value should be used   If you choose col-lg-n then the columns will display correctly until the screen width drops below the xs threshold of 1200px

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I think this image is pretty good to understand the concept better   for more detail understanding please go though below link   https   getbootstrap com docs 3 4 css

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Let s un-complicate Bootstrap   Notice how the col-sm occupies the 100  width  in other terms breaks into new line  below 576px but col doesn t  You can notice the current width at the top center in gif  Here comes the code   lt div class  quot container quot  gt       lt div class  quot row quot  gt           lt div class  quot col quot  gt col lt  div gt           lt div class  quot col quot  gt col lt  div gt           lt div class  quot col quot  gt col lt  div gt       lt  div gt       lt div class  quot row quot  gt           lt div class  quot col-sm quot  gt col-sm lt  div gt           lt div class  quot col-sm quot  gt col-sm lt  div gt           lt div class  quot col-sm quot  gt col-sm lt  div gt       lt  div gt   lt  div gt   Bootstrap by default aligns all the columns col  in a single row with equal width  In this case three col will occupy 100  3 width each  whatever the screen size  You can notice that in gif  Now what if we want to render only one column per line i e give 100  width to each column but for smaller screens only  Now comes the col-xx classes  I used col-sm because I wanted to break the columns into separate lines below 576px  These 4 col-xx classes are provided by Bootstrap for different display devices like mobiles  tablets  laptops  large monitors etc  So col-sm would break below 576px  col-md would break below 768px  col-lg would break below 992px and col-xl would break below 1200px  Note that there s no col-xs class in bootstrap 4    This pretty much sums-up  You can go back to work   But there s bit more to it  Now comes the col-  and col-xx-  for customizing width  Remember in the above example I mentioned that col or col-xx takes the equal width in a row  So if we want to give more width to a specific col we can do this  Bootstrap row is divided into 12 parts  so in above example there were 3 col so each one takes 12 3   4 part  You can consider these parts as a way to measure width  We could also write that in format col-  i e  col-4 like this    lt div class  quot row quot  gt     lt div class  quot col-4 quot  gt col lt  div gt     lt div class  quot col-4 quot  gt col lt  div gt     lt div class  quot col-4 quot  gt col lt  div gt   lt  div gt   And it would ve made no difference because by default bootstrap gives equal width to col  4   4   4   12   But  what if we want to give 7 parts to 1st col  3 parts to 2nd col and rest 2 parts  12-7-3   2  to 3rd col  7 3 2 so total is 12   we can simply do this   lt div class  quot row quot  gt     lt div class  quot col-7 quot  gt col-7 lt  div gt     lt div class  quot col-3 quot  gt col-3 lt  div gt     lt div class  quot col-2 quot  gt col-2 lt  div gt   lt  div gt    and you can customize the width of col-xx-  classes also   lt div class  quot row quot  gt       lt div class  quot col-sm-7 quot  gt col-sm-7 lt  div gt       lt div class  quot col-sm-3 quot  gt col-sm-3 lt  div gt       lt div class  quot col-sm-2 quot  gt col-sm-2 lt  div gt   lt  div gt    How does it look in the action   What if sum of col is more than 12  Then the col will shift adjust to below line  Yes  there can be any number of columns for a row   lt div class  quot row quot  gt           lt div class  quot col-12 quot  gt col-12 lt  div gt           lt div class  quot col-9 quot  gt col-9 lt  div gt           lt div class  quot col-6 quot  gt col-6 lt  div gt           lt div class  quot col-6 quot  gt col-6 lt  div gt       lt  div gt    What if we want 3 columns in a row for large screens but split these columns into 2 rows for small screens   lt div class  quot row quot  gt       lt div class  quot col-12 col-sm quot  gt col-12 col-sm TOP lt  div gt       lt div class  quot col col-sm quot  gt col col-sm lt  div gt       lt div class  quot col col-sm quot  gt col col-sm lt  div gt   lt  div gt     You can play around here  https   jsfiddle net JerryGoyal 6vqno0Lm

User · Answer

One particular case   Before learning bootstrap grid system  make sure browser zoom is set to 100   a hundred percent   For example   If screen resolution is  1600px x 900px  and browser zoom is 175   then  bootstrap-ped  elements will be stacked   HTML   lt div class  container-fluid  gt       lt div class  row  gt           lt div class  col-lg-4  gt class  col-lg-4  lt  div gt           lt div class  col-lg-4  gt class  col-lg-4  lt  div gt       lt  div gt   lt  div gt    Chrome zoom 100   Browser 100 percent - elements placed horizontally  Chrome zoom 175   Browser 175 percent - stacked elements

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TL DR   col-X-Y means on screen size X and up  stretch this element to fill Y columns    Bootstrap provides a grid of 12 columns per  row  so Y 3 means width 25    xs  sm  md  lg are the sizes for smartphone  tablet  laptop  desktop respectively   The point of specifying different widths on different screen sizes is to let you make things larger on smaller screens   Example   lt div class  col-lg-6 col-xs-12  gt    Meaning  50  width on Desktops  100  width on Mobile  Tablet  and Laptop

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The bootstrap docs do explain it  but it still took me a while to get it  It makes more sense when I explain it to myself in one of two ways   If you think of the columns starting out horizontally  then you can choose when you want them to stack   For example  if you start with columns  A   B   C  You decide when should they stack to be like this   A  B  C  If you choose col-lg  then the columns will stack when the width is  lt  1200px   If you choose col-md  then the columns will stack when the width is  lt  992px   If you choose col-sm  then the columns will stack when the width is  lt  768px   If you choose col-xs  then the columns will never stack   On the other hand  if you think of the columns starting out stacked  then you can choose at what point they become horizontal   If you choose col-sm  then the columns will become horizontal when the width is    768px   If you choose col-md  then the columns will become horizontal when the width is    992px   If you choose col-lg  then the columns will become horizontal when the width is    1200px

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Device Sizes and class prefix   Extra small devices Phones   lt 768px  -  col-xs- Small devices Tablets   768px  -  col-sm- Medium devices Desktops   992px  -  col-md- Large devices Desktops   1200px  -  col-lg-  Grid options   Reference  Grid System

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Updated 2020    Bootstrap 5 In Bootstrap 5  alpha  there is a new -xxl- size  col-  - 0  xs  col-sm-  - 576px col-md-  - 768px col-lg-  - 992px col-xl-  - 1200px col-xxl-  - 1400px Bootstrap 5 Grid Demo  Bootstrap 4 In Bootstrap 4 there is a new -xl- size  see this demo  Also the -xs- infix has been removed  so smallest columns are simply col-1  col-2   col-12  etc   col-  - 0  xs  col-sm-  - 576px col-md-  - 768px col-lg-  - 992px col-xl-  - 1200px Bootstrap 4 Grid Demo Additionally  Bootstrap 4 includes new auto-layout columns  These also have responsive breakpoints  col  col-sm  col-md  etc     but don t have defined   widths  Therefore  the auto-layout columns fill equal width across the row   Bootstrap 3 The Bootstrap 3 grid comes in 4 tiers  or  quot breakpoints quot       Extra small  for smartphones  col-xs-   Small  for tablets  col-sm-   Medium  for laptops  col-md-   Large  for laptops desktops  col-lg-     These grid sizes enable you to control grid behavior on different widths  The different tiers are controlled by CSS media queries  So in Bootstrap s 12-column grid    col-sm-3 is 3 of 12 columns wide  25   on a typical small device width   gt  768 pixels  col-md-3 is 3 of 12 columns wide  25   on a typical medium device width   gt  992 pixels   The smaller tier  xs  sm or md  also defines the size for larger screen widths  So  for the same size column on all tiers  just set the width for the smallest viewport     lt div class  quot col-lg-3 col-md-3 col-sm-3 quot  gt    lt  div gt  is the same as   lt div class  quot col-sm-3 quot  gt    lt  div gt  Larger tiers are implied  Because col-sm-3 means 3 units on sm-and-up  unless specifically overridden by a larger tier that uses a different size  xs default   gt  overridden by sm  gt  overridden by md  gt  overridden by lg  Combine the classes to use change column widths on different grid sizes  This creates a responsive layout   lt div class  quot col-md-3 col-sm-6 quot  gt    lt  div gt  The sm  md and lg grids will all  quot stack quot  vertically on screens viewports less than 768 pixels  This is where the xs grid fits in  Columns that use the col-xs-  classes will not stack vertically  and continue to scale down on the smallest screens  Resize your browser using this demo and you ll see the grid scaling effects   This article explains more about how the Bootstrap grid

User · Answer

well it s used to tell bootstrap how many columns are to be placed in a row depending on the screen size-  col-xs-2   would show only 2 columns in a row in extra small xs  screen  in the same way as sm defines a small screen  md medium sized   lg large sized   but according to bootstrap smaller first rule  if you mention  xs-col-2 md-col-4   then 2 columns would be shown in every row for screen sizes from xs upto sm included  and changes when it gets next size i e  for md up to lg included  for a better understanding of screen sizes try running them in various screen modes in chrome s developer mode ctr shift i  and try various pixels or devices

User · Answer

col-xs-     Extra Small      Phones Less than 768px    col-sm-     Small Devices    Tablets 768px and Up    col-md-     Medium Devices   Desktops 992px and Up    col-lg-     Large Devices    Large Desktops 1200px and Up

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