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The simple theme renders “bare bones” HTML elements. The simple theme is most often used as a starting point for other themes. (See Extending Themes for more.)
For example, the textfield tag renders the HTML <input/> tag without a label, validation, error reporting, or any other formatting or functionality.
Both the xhtml theme and css_xhtml theme extend the simple theme. Look to them for examples of how to build on the foundation laid by the simple theme.
The simple theme head template prints out a javascript include required for the datetimepicker tag to render properly.
The simple themehead template only does one thing: it loads the minimal Ajax/Dojo support so that tags can import Dojo widgets easily.
The source of the simple head.ftl template is:
{% highlight freemarker %} {% remote_file_content https://raw.githubusercontent.com/apache/struts/master/core/src/main/resources/template/simple/head.ftl %} {% endhighlight %}