The Problem

If you use the Recent Comments sidebar widget in your WordPress installation, it's possible that you want to customize this widget's style.

You will quickly find, however, that as soon as you add the widget to your sidebar, it injects the following inline, hardcoded CSS into the containing page (using !important to make things worse): 

<style type="text/css">.recentcomments a{display:inline !important;padding:0 !important;margin:0 !important;}</style>

The code above comes from recent_comments_style() (found in wp-includes/default-widgets.php), which is in turn called by WP_Widget_Recent_Comments() in the same file (this is just an old-style PHP4 constructor – same as PHP5's __construct()), which is triggered when the Recent Comments widget is used:

add_action( 'wp_head', array(&$this, 'recent_comments_style') );

This leaves a bad taste in my mouth because: