> 21 Mapping text formats to HTML/XML > 21.10 Configuring preformatted text for HTML/XML
Paragraphs to which you have assigned the pre format property (for “preformatted” text) become blocks enclosed in <pre> tags in HTML. Browsers and other HTML viewers treat text within <pre> tags differently from other text. For example, long lines do not wrap when you narrow the viewer window, and whitespace is preserved.