| Basis off |
Bootstrap 3 |
Bootstrap 4 |
|
| Grid System |
It is based on 4 tier grid system (xs, sm, md, lg). |
It is based on 5 tier grid system (col, sm, md, lg, xl). |
|
| CSS File |
LESS |
SASS |
|
| Horizontal Form |
.row class is not required using grid in forms. |
.row class is required when using grid in form. |
|
| Primary Unit |
px |
rem |
|
| Font Size |
14px |
16px |
|
| Responsive Image |
Use .img-responsive class. |
Use .img-fluid class. |
|
| Image Alignment |
Use .pull-right and .pull-left class. |
You can use .pull-right, .pull-left |
|
| Offsetting Columns |
Uses col-*-offset-* classes to offset columns. For example, col-md-offset-4. |
Uses offset-*-* classes to offset columns. For example, offset-md-4. |
|
| Flexbox |
No |
Yes |
|
| Generic Class |
No |
mt-1, pt-2 |
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