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Theme Switching is the process of providing the ability for the user to change the presentation styles or "look" of your site with the use of a Theme Switcher. The process of changing your WordPress Theme by the site Administrator is not called theme switching. Information on changing your site's Theme is found at Using Themes.
Theme Switchers are add-ons which allow the user to control the look of your site. Some Theme Switchers are manually chosen by the user, and others will change the look of the site with every page refresh.
Using Theme Switchers to enhance your site can showcase your talents as a web page designer, or provide entertainment for your users.
Whatever your reasons for using Theme Switchers, make sure that each theme you use has been thoroughly tested and validated for errors. Make sure that it works well with the content on your site.
Most WordPress Themes come ready out of the box to handle most layout concerns, but not for specific XHTML uses and CSS needs you may use within your posts. Check for any specific styles required within your posts that may not be addressed by each Theme such as:
If necessary, make sure each Theme features the additional styles in that Theme's style sheet.
Different tools for Theme Switching are listed below, but in general the Themes in your /wp-content/themes/ folder will dictate the number of Themes avaiable for the user to switch between.
To switch themes with these plugins you can enter a URL such as this in your browser:
Theme Preview also allows you to specify which stylesheet to use.