replace html tables with markdown in migration

1 files changed, 24 insertions, 44 deletions

diff --git a/docs/migration.md b/docs/migration.md
index 9051b00b4..4b7c360e6 100644
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -7,60 +7,40 @@ title: Migrating to v4.x.x
 
 Bootstrap 4 is not backwards compatible with v3.x.x. Use this section as a general guide to upgrading from v3.x.x to v4.0.0. For a broader overview, see [what's new](http://blog.getbootstrap.com/DEAD-LINK-FIX-ME-PLEASE) in the v4.0.0 release announcement.
 
+## At a glance
+
+- Dropped IE8 support—v4 is now only IE9+. For sites needing IE8, use v3.
+- 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`.
+- Dropped panels, thumbnails, and wells for a new component, cards.
+- Switched from LESS to SCSS for our source CSS files.
+- 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.
+
 ## Major class changes
+
 This table shows the style changes between v3.x.x and v4.0.0.
 
-<table>
-  <thead>
-    <tr>
-      <th>Bootstrap 3.x.x</th>
-      <th>Bootstrap 4.0.0</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td></td>
-      <td></td>
-    </tr>
-  </tbody>
-</table>
+| Bootstrap 3.x.x | Bootstrap 4.0.0 |
+| --- | --- |
+|  |  |
 
 ## What's new
 We've added new components and changed some existing ones. Here are the new or updated styles.
 
-<table>
-  <thead>
-    <tr>
-      <th>Component</th>
-      <th>Description</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td></td>
-      <td></td>
-    </tr>
-  </tbody>
-</table>
+| Component | Description |
+| --- | --- |
+| 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. |
 
 ## What's removed
 The following components have been removed in v4.0.0.
 
-<table>
-  <thead>
-    <tr>
-      <th>Component</th>
-      <th>Removed from 3.x.x</th>
-      <th>4.0.0 Equivalent</th>    
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <td></td>
-      <td></td>
-      <td></td>
-    </tr>
-  </tbody>
-</table>
+| Component | Removed from 3.x.x | 4.0.0 Equivalent |
+| --- | --- | --- |
+|  |  |  |
 
 ## Additional notes