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Most graphical [[e-mail client]]s support HTML email, and many default to it.<ref>[http://www.expita.com/nomime.html#programs Configuring Mail Clients to Send Plain ASCII Text] — E-mail client programs</ref> Many of these clients include both a [[GUI]] editor for composing HTML e-mails and a rendering engine for displaying received HTML e-mails.
HTML mail allows the sender to properly express headings, bulleted lists, emphasized text, [[subscript]]s and [[superscript]]s, and other visual and [[typographic]] cues to improve the readability and aesthetics of the message. Long [[URL]]s can be linked to without being broken into multiple pieces, and text is wrapped to fit the width of the user agent's viewport, instead of uniformly breaking each line at 78 characters (defined in RFC 2822, which was necessary on older [[data terminal]]s). It allows in-line inclusion of diagrams or mathematical formula as images, which are otherwise difficult to convey (typically using [[ASCII art]]).
== Compatibility ==
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