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What are the biggest Bootstrap 5 breaking changes?
(1) jQuery no longer required — data-* renamed to data-bs-* (data-toggle→data-bs-toggle). (2) Directional utilities renamed start/end: ml-*→ms-*, mr-*→me-*, text-left→text-start, float-left→float-start.
What Bootstrap 4 components were removed in Bootstrap 5?
Jumbotron, media object, badge colour classes (badge-primary etc.), badge-pill. All custom form controls renamed: custom-select→form-select, custom-range→form-range, custom-control→form-check.
What replaced glyphicons?
Glyphicons removed in Bootstrap 4. Use Bootstrap Icons (cdn.jsdelivr.net/npm/bootstrap-icons), Font Awesome, or inline SVG.