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What is Bootstrap 4?

The Bootstrap 4 is the newest version of Bootstrap, which is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first web sites. The new features are,
  • Bootstrap 4 Source CSS files Converted in SCSS.
  • Bootstrap 4 has 5 grid system (.col-, .col-sm-3, .col-md-3, .col-lg-3, .col-xl-3). 
  • Bootstrap 4 has removed the xs from the lowest breakpoint. Therefore, (col-) covers all devices.
  • Bootstrap 4 has changed the offset class (.offset-md-4)
  • In Bootstrap 3 we are used this (.img-responsive) class for the responsive image. Bootstrap 4 has changed the class for a responsive image (.img-fluid).
  • Bootstrap 4 has changed to (.form-control-lg) and (.form-control-sm) to increase and decrease the input size. 
To learn more click here. 
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