If you have a class derived from HtmlAreaMixin (or a Folder +htmlArea in the acquisition path), and 

  <dtml-var htmlArea_style>
  <dtml-var htmlArea_prefix>

in your html <head> section, turning an ordinary textarea into a WYSIWIG editor is done by a simple

  <dtml-var "htmlArea_editor('name')">

(name being the name of your textarea). This is what you get:

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If you can read this text, it means you are not experiencing the Plone design at its best. Plone makes heavy use of CSS, which means it is accessible to any internet browser, but the design needs a standards-compliant browser to look like we intended it. Just so you know ;)

(Of course, the content depends on the content of your textarea) As you can see, the bold button is pushed down, dependent on the current cursor position!