Conditional Stylesheets
Internet Explorer implements a proprietary technology called Conditional Comments. While web developers frown upon technologies that aren't cross-browser supported, many CSS developers have found Conditional Comments very useful since they can be used to fix the rendering of CSS in IE by placing IE-only CSS inside conditional comments.
The Conditional Stylesheets module allows themes to easily add conditional stylesheets to the theme's .info file.
Conditional Stylesheets on Drupal 8
This module allows you to add "conditional-stylesheets" in a much simpler
For Drupal 6
Using this module is easier than manually adding conditional comments specifically to the page.tpl.php template or appending them to the
For Drupal 7
Without this module, the only way to have IE conditional stylesheets was to add 37 lines of code (more if you want to add more than one