If you specify simple as the toolbar set, you get a very basic set of controls:
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In this example, additionally the height and width were specified:
htmlArea_editor(name, 'simple', height=100, width=50)
(surrounding dtml-var tag omitted for clarity). You may use integer or string values. Integers are always taken for px, as for the height; for the width, integer values <= 100 are taken for a percentage. Thus, this text control is 50% wide.
Of course you can use string values as well, e.g. '50px' or '90%'.