/indra/newview/skins/default/xui/en/floater_test_text_editor.xml

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<floater
 legacy_header_height="18"
 can_resize="true"
 height="600"
 layout="topleft"
 name="floater_test_text_editor"
 translate="false"
 width="800">
  <text_editor
   height="50"
   follows="top|left|bottom"
   left="10"
   name="test_text_editor"
   tool_tip="text editor"
   top="25"
   word_wrap="true" 
   width="200">
    Text Editor
  </text_editor>
  <text_editor
   height="50"
   follows="top|left|bottom"
   font="SansSerif" 
   left="10"
   name="test_text_editor"
   tool_tip="text editor"
   top_pad="10"
   width="200">
    This contains long text and should scroll horizontally to the right
  </text_editor>
  <text_editor
   height="50"
   follows="top|left|bottom"
   font="SansSerif"
   left="10"
   name="numeric_text_editor"
   tool_tip="text editor for numeric text entry only"
   top_pad="10"
   text_type="int"
   width="200">
    This is text that is NOT a number, so shouldn't appear
  </text_editor>

</floater>