{% elsif page.url contains "about" %}
<h1>About</h1>
<p class="lead">Learn about the project's history, meet the maintaining teams, and find out how to use the Bootstrap brand.</p>
+ {% elsif page.url contains "migration" %}
+ <h1>Migration</h1>
+ <p class="lead">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.</p>
{% endif %}
{% include ads.html %}
title: Migrating to v4.x.x
---
-## Migrating from 3.x.x to 4.0.0
+## Summary
-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
+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.
- Switched from `px` to `rem` as our primary unit in CSS.