Discrepancies between Boosted and Bootstrap - Orange-OpenSource/Orange-Boosted-Bootstrap GitHub Wiki
Here is a non-exhaustive list of discrepancies exist between Boosted and Boostrap.
Hidden text instead of an aria-label
In Bootstrap, we have for example <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>.
In Boosted, we rather have <button type="button" class="btn-close" data-bs-dismiss="modal"><span class="visually-hidden">Close</span></button>.
We prefer to have an hidden text in CSS rather than an aria-label because we can get the visible label when the CSS is deactivated.