I am quite impressed with the latest version of bootstrap. And I have started to work on it. Now I can understand that the grid system works on 4 column class size variants, with the following definition:
col-xs-* ---> mobile
col-sm-* ---> tablet
col-md-* ---> laptops
col-lg-* ---> large monitors
However, I need to know, what is the minimum and maximum resolutions for which these classes gets applied on so that I can design the layout better.
I am asking this because, I could see col-md class applied at 800px. I generated this resolution using Firefox's responsive view simulator.
While Bootstrap 3 provided Skip navigation, Nested headings, and color contrast, Bootstrap 4 has improved the accessibility with its components. Styling and layout from version 4 can be applied to a wide range of markup structures.
Bootstrap 3 is the most stable version of Bootstrap, and it is still supported by the team for critical bugfixes and documentation changes.
You should know that there is still support to continue using Bootstrap 3, but due to some changes that arose in the structure of Bootstrap 4 over its previous version, it is better to start developing or migrating our applications to this incredible new version.
$grid-breakpoints: ( xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px );
From the documentation for the grid:
/* Extra small devices (phones, less than 768px) / / No media query since this is the default in Bootstrap */
/* Small devices (tablets, 768px and up) */ @media (min-width: @screen-sm-min) { ... }
/* Medium devices (desktops, 992px and up) */ @media (min-width: @screen-md-min) { ... }
/* Large devices (large desktops, 1200px and up) */ @media (min-width: @screen-lg-min) { ... }
It also provides the container widths:
col-xs-* = less than 768px
col-sm-* = 768px and up
col-md-* = 992px and up
col-lg-* = 1200px and up
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