Looking forward to Bootstrap 4
summary
Bootstrap 4 moves the codebase from Less to Sass and rewrites the JavaScript with AMD support and optional flexbox, adds an extra XL breakpoint, renames utilities (e.g., .img-fluid, breakpoint-specific pulls), and replaces wells/panels/thumbnails with cards replace panels (card, card-block, header/footer). Glyphicons are removed, IE8 support is dropped, forms offer owner-drawn custom controls for consistent checkboxes/selects, and progress uses the native <progress>; Alpha is unstable so test before upgrading.
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