I have a bunch of code that I tend to put into the header.php of every site I do which are specific to Internet Explorer.

I was wondering if there was a way to insert code into a 'standard' header.php.

Yes, I can simply modify the header. But the idea is to make this a plugin which is generic.

Specifically, I'd like to create a plugin to echo the following in the header immediately after the default stylesheet:

<!--[if IE]>
  <link rel="stylesheet" href="<?php bloginfo('stylesheet_directory'); ?>/ie.css" type="text/css" />

2 Answers 2


Specifically, I'd like to create a plugin to echo the following in the header immediately after the default stylesheet

The preferred way is to enqueue it, with the default/main stylesheet as the dependency.

Here's a demo plugin, with the structure:

+ plugins/
+--+ my-ie-style/
   +--+ my-ie-style.php
   +--+ css/
      +--+ ie.css

where the my-ie-style.php file is:

 * Plugin Name: Demo - My IE style
 * Plugin URI:  http://wordpress.stackexchange.com/a/85496/26350
 * Description: Enqueue With IE conditional, depending on the main-style stylesheet
 * Author:      wpse
 * Version:     1.0.0
add_action( 'wp_enqueue_scripts', function()
    // Register
       'my-ie-style',                                 // handle
       plugin_dir_url( __FILE__  ) . 'css/ie.css',    // file
       [ 'main-style' ],                              // dependency    <-- ADJUST THIS!
       '1.0.0',                                       // version
       'all'                                          // media

    // Enqueue
    wp_enqueue_style( 'my-ie-style' );

    // Add IE conditional
        'my-ie-style',  // handle
        'conditional',  // key ('conditional', 'rtl', 'suffix', 'after', 'alt', 'title')
        'IE'            // value
} );

This will generate the following within the <head> tag:

<link rel='stylesheet' 
      media='all' />

<!--[if IE]>
<link rel='stylesheet' 
      media='all' />

where our custom IE stylesheet loads after the main stylesheet.

Hopefully you can adjust it to your needs.

  • Fabulous! I -knew- there had to be a way that worked within the WP core. Big Cheers! Opens up a number of other possibilities.
    – jchwebdev
    Commented Feb 12, 2013 at 20:36
  • Erm, where do i add that first part? Commented Jul 10, 2016 at 12:39
  • Please check the updated the answer @greenleader
    – birgire
    Commented Jul 11, 2016 at 21:56

You want wp_enqueue_style(). It's considered best practice and all around more elegant than hooking into the wp_head.


  • 1
    What would one do about the IE checking using wp_enqueue_style?
    – brasofilo
    Commented Feb 12, 2013 at 3:50

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