With the SO Responsive Content plugin you can easily adjust the length of your content for different devices by making use of visibility classes.
For sites that have been built Responsive, this plugin will enable you to adjust your content too. On mobile devices like smart phones people are less likely to read very long pages of content and with the Responsive Content plugin you can easily adjust the text showing on these different devices.
The SO Responsive Content plugin adds a Formats drop down menu (pre WP 3.9 the menu is called "Styles") to the first line of the TinyMCE Editor. Once you have selected a visibility class, the plugin shows that in 3 locations:
There are 15 visibility classes in the Styles menu on the Visual Editor:
Since version 0.3 I have added 6 buttons to the Text Editor as well. For flexibility purposes these buttons (3 for showing and 3 for hiding) only add a class, so you can add the element yourself.
The plugin already comes with all the styles necessary to show the elements on or hide them from the front end, so all you need to do is save your Post, Page or other Post Type and visit your site from a few different devices (or resize your browser) to see your content change depending on the width of the browser!
Under the Other Notes-tab I have added some information on Usage and Languages.