### JavaScript
- Data attributes for all JavaScript plugins are now namespaced to help distinguish Bootstrap functionality from third parties and your own code. For example, we use `data-bs-toggle` instead of `data-toggle`.
+- Updated Popper to v2.x:
+ - Removed `offset` option from our Tooltip/Popover and Dropdown plugins; this can still be achieved using the `popperConfig` parameter.
+ - The `fallbackPlacement` option has become `fallbackPlacements`.
### Sass
- Dropped jQuery dependency and rewrote plugins to be in regular JavaScript.
- Removed underscore from public static methods like `_getInstance()` → `getInstance()`.
-- Moved from Popper v1.x to Popper v2.x
-- Removed `offset` option from our Tooltip/Popover and Dropdown plugin, this can still be achieve using `popperConfig` parameter.
### Color system