IE 9 not supported list v4 flexbox

add flexbox to the not supported list

https://github.com/twbs/bootstrap/issues/17802

diff --git a/docs/getting-started/browsers-devices.md b/docs/getting-started/browsers-devices.md
index 0f98f0678466c35be6900f47607932db1a319a6b..bcaf57c3e27f57171be0f1191c4f3bd720bb020a 100644 (file)
--- a/docs/getting-started/browsers-devices.md
+++ b/docs/getting-started/browsers-devices.md
@@ -131,6 +131,10 @@ Internet Explorer 9 is also supported, however, please be aware that some CSS3 p
         <th scope="row"><code>placeholder</code></th>
         <td class="text-danger">Not supported</td>
       </tr>
+      <tr>
+      <th scope="row"><code>flexbox</code></th>
+      <td class="text-danger">Not supported</td>
+      </tr>
     </tbody>
   </table>
 </div>