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What is the difference between Bootstrap 3 and Bootstrap 4

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PARAMETER BOOTSTRAP 3 BOOTSTRAP 4
Grid System 4 tier grid system (xs, sm, md, lg). 5 tier grid system (xs, sm, md, lg, xl).
CSS File LESS SASS
Button Size Bootstrap 3 supports .btn-xs class. Only .btn-sm and .btn-lg are available in bootstrap 4.
Horizontal Form We do not need a .row class using a grid in forms. .row class is needed when using the grid in form.
Inverse/dark Table .table-inverse class is not supported. .table-inverse class is supported.
Primary Unit Primary unit is px. Primary unit is rem
Table Head Styles Table head styles are not supported. In bootstrap 4, table head styles with the .thead-light and .thead-dark classes.
Condensed Tables It supports .table-condensed. It supports .table-sm.
Responsive Image .img-responsive class is to be used. .img-fluid class is to be used.
Image Alignment Use the .pull-right and .pull-left class. One can use .pull-right, .pull-left and other such classes like .text-left and .text-center.
Structure In order to apply dropdown list, we use <ul>, <li> In order to apply .dropdown-item, we use <a>, <button>.
Color Limited colors are available; it supports inverse navbars but not other classes. There are many colors; .bg-dass or .navbar-light, .navbar-dark classes are supported.
Jumbotron .jumbotron-fluid class is not required for full-width. .jumbotron-fluid class is required for a full-width jumbotron.
Show content .in is used to expand content when the page loads. .show is used to expand content when the page loads.
Glyphicons Supported. Not supported.
Breadcrumb class .breadcrumb class is used against the <ul> tag. .breadcrumb class is used against the <li> tag.
Affix Supported. Not supported.
Flexbox Not supported. Supported.
Carousel Item It uses the .item class. It uses the .carousel-item class.
Dividers .divider class is applied to <li> element. .dropdown-divider class is applied to <div> element.
Panels, Wells and Thumbnails Supported. Not supported. Cards are used instead.

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