Change record status: 
Project: 
Introduced in branch: 
8.x
Description: 

For consistency with other page elements (breadcrumb, navigation, etc.) messages are now wrapped in their own <div id="messages"> in the default page.tpl.php (modules/system/page.tpl.php):

<?php if ($messages): ?>
  <div id="messages"><?php print $messages; ?></div>
<?php endif; ?>

This change could affect CSS-only themes and all themes not implementing their own page.tpl.php.

Impacts: 
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Not done