Peter Wilson

Many browsers will not render your webpage until the print.css is loaded. Delay Print CSS prevents this from happening. Once your page has fully rendered (including JavaScript, images, etc) your print stylesheets will be loaded.
Using the methods described in a <a href="http://bigredtin.com/behind-the-websites/delay-loading-of-print-css/" rel="nofollow ugc">recent blog post</a> this plugin uses JavaScript, with a non JavaScript fallback, to load your stylesheets last.
If your WordPress site uses jQuery then it is used to load the stylesheets, otherwise the plugin outputs its own JavaScript.

Delay Print CSS

Prevent your print stylesheets from delaying rendering of your website

qstudio

Easily include browser specific stylesheets in templates or select browser and version specific classes in CSS.
Conditional browser stylesheets are added after the main theme style.css allowing them to overrule previous rules – you only need to add the CSS rules that should change.
This plugin uses up-to-date WordPress top level functions, sanitizes all input data and is fully internationalized.
For feature request and bug reports, <a href="https://qstudio.us/support/categories/conditional-stylesheets-and-body-classes" rel="nofollow ugc">please use the Q Support Website</a>.
Please do not use the WordPress.org forum to report bugs, as we no longer monitor or respond to questions there.
<h4>Features</h4>
<ul>
<li>Checks for and adds browser and version specific stylesheets – such as “browsers-windows-firefox.css”.</li>
<li>Add browser and version specific body classes to all pages – such as body.browsers-msie-10</li>
<li>Includes the Mobile Detect class and adds mobile & touch body classes.</li>
<li>Adds a post type body class, for example: “posttype-page”.</li>
<li>Inserts handy HTML comments in the HTML footer of template files to tell you which CSS files could be used and which were found.</li>
</ul>

Conditional Stylesheets and Body Classes

Add conditional browser stylesheets and body class declarations

Delay Print CSS vs Conditional Stylesheets and Body Classes