Merge pull request #47 from twbs/migration-catch-up

Migration guide catch up

docs/migration.md

@@ -8,6 +8,7 @@ title: Migrating to v4.x.x
 For a broader overview, see [what's new](http://blog.getbootstrap.com/DEAD-LINK-FIX-ME-PLEASE) in the v4.0.0 release announcement.
 
 - Dropped IE8 support—v4 is now only IE9+. For sites needing IE8, use v3.
+- Added official support for Android v5.0 Lollipop's Browser and WebView. Earlier versions of the Android Browser and WebView remain only unofficially supported.
 - Switched from `px` to `rem` as our primary unit in CSS.
 - Media queries are now in `em`s.
 - Global font-size increased from `14px` to `16px`.
@@ -16,6 +17,9 @@ For a broader overview, see [what's new](http://blog.getbootstrap.com/DEAD-LINK-
 - Added a new grid tier for ~`480px` and below.
 - Dropped Glyphicons icon font.
 - Refactored nearly all components to use more unnested classes instead of children selectors.
+- Non-responsive usage of Bootstrap is no longer supported.
+- Dropped the online Customizer in favor of more extensive setup documentation.
+- Replaced the separate optional theme with...
 
 ## Major class changes
 
@@ -23,7 +27,12 @@ This table shows the style changes between v3.x.x and v4.0.0.
 
 | Bootstrap 3.x.x | Bootstrap 4.0.0 |
 | --- | --- |
-|  |  |
+| Pager's `.previous` | `.pager-prev` |
+| Pager's `.next` | `.pager-next` |
+| Carousel's `.item` | `.carousel-item` |
+| Tabs | |
+| Pills | |
+| Buttons | |
 
 ## What's new
 We've added new components and changed some existing ones. Here are the new or updated styles.
@@ -32,13 +41,31 @@ We've added new components and changed some existing ones. Here are the new or u
 | --- | --- |
 | Cards | New, more flexible component to replace v3's panels, thumbnails, and wells. |
 | New navbar | Replaces the previous navbar with a new, simpler component. |
-| New progress bars | Replaces the old `.progress` with a real `<progress>` element. |
+| New progress bars | Replaces the old `.progress` `<div>` with a real `<progress>` element. |
+| New table variants | |
+| New utility classes | |
+
+TODO: audit new classes that didn't exist in v3
 
 ## What's removed
 The following components have been removed in v4.0.0.
 
 | Component | Removed from 3.x.x | 4.0.0 Equivalent |
 | --- | --- | --- |
-|  |  |  |
+| Panels |  | Cards |
+| Thumbnails |  | Cards |
+| Wells |  | Cards |
+| Justified navs | | |
+
+TODO: audit classes in v4 that aren't present in v4
+
+The following deprecated Less/SCSS variables have been removed in v4.0.0:
+* `@screen-phone`, `@screen-tablet`, `@screen-desktop`, `@screen-lg-desktop`. Use the more abstract `$screen-{xs,sm,md,lg,xl}-*` variables instead.
+* `@screen-sm`, `@screen-md`, `@screen-lg`. Use the more clearly named `$screen-{xs,sm,md,lg,xl}-min` variables instead.
+* `@screen-xs`, `@screen-xs-min`. The extra small breakpoint has no lower bound, so these variables were logically absurd. Reformulate your expression in terms of `$screen-xs-max` instead.
+* `@grid-float-breakpoint`
+
+TODO: audit list of stuff in v3 that was marked as deprecated
 
 ## Additional notes
+- Removed support for styled nested tables (for now)