shawfactor

Ever wanted to style your content differently depending on the role of the logged in user viewing your content?
Well now you can, simply activate the plugin and you are right to go.
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LH Add Roles to Body Class

Adds the currently logged in users role (or roles) to the body class in both the front and back end.

trauben-nuss

This plugin adds a abbreviation of the operating system (win, mac, linux, iPad, iPhone) to the body-tag. 
So if there’s a OS-specific difference, you can easily react to it by using the css-selector (e.g. “.mac”).
Next steps of this plugin: 
* adding a settings page 
* add the class to specified elements 
* add user-language-abbreviation to specified elements
let me know, if you wish something helpful.

OS Adder

Add the operating-system's abbreviation as a CSS-Class to the body-tag.

LH Add Roles to Body Class vs OS Adder