Index: src/wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-posts-list-table.php	(revision 48208)
+++ src/wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -1544,7 +1544,7 @@
 
 							<label>
 								<span class="title"><?php _e( 'Slug' ); ?></span>
-								<span class="input-text-wrap"><input type="text" name="post_name" value="" /></span>
+								<span class="input-text-wrap"><input type="text" name="post_name" value="" spellcheck="false" /></span>
 							</label>
 
 						<?php endif; // is_post_type_viewable() ?>