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Fixes #18768: Add migration docs for dropdowns

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Mark Otto 2016-05-08 15:07:16 -07:00
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docs/migration.md
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@ -104,6 +104,14 @@ New to Bootstrap 4 is the Reboot, a new stylesheet that builds on Normalize with
- Dropped the `.btn-group-xs` class entirely given removal of `.btn-xs`.
### Dropdowns
- Switched from parent selectors to singular classes for all components, modifiers, etc.
- Dropdowns can be built with `<div>`s or `<ul>`s now.
- Rebuilt dropdown styles and markup to provide easy, built-in support for `<a>` and `<button>` based dropdown items.
- Dropdown items now require `.dropdown-item`.
- Dropdown toggles no longer require an explicit `<span class="caret"></span>`; this is now provided automatically via CSS's `::after` on `.dropdown-toggle`.
### Grid system
- Added a new `~480px` grid breakpoint, meaning there are now five total tiers.