E-Mail Reference - Usable HTML Tags / CSS Properties

This document was written to be an evaluation of what HTML tags and CSS properties actually work in HTML-based e-mail, and from these observations establish a best practices format that will work as coded and as visualized in a consistent format across as many e-mail clients as possible.

Practical Upshot: How can I write an HTML-based e-mail that will look the same no matter what e-mail client/platform views it?

History
CSS Properties

HTML Tags
Skeletal Tags <!DOCTYPE ... > <html> <head> <body> <frameset> <frame> <noframes> <layer>	Header Tags <base> <basefont> <isindex> <link> <meta> <nextid> <style> <title>	Hyperlinks <a> <map> / <area>
Physical Text Markup Tags <b> <big> <blink> <i> <s> <small> <strike> <sub> <sup> <tt> <u>	Content-Based Text Markup Tags <abbr> <acronym> <cite> <code> <del> <dfn> <em> <ins> <kbd> <samp> <strong> <var>	Content Presentation and Flow <address> <bdo> <blockquote> <br> <center> <div> <font> <h1> ... <h6> <hr> <iframe> <listing> <nobr> / <wbr> <p> <plaintext> <pre> <q> <span> <xmp>
Rules, Images, and Colors <hr> <img> color= bgcolor= background= <bgsound> <marquee>	Formatted Lists <dir> / <li> <dl> / <dt> / <dd> <menu> / <li> <ol> / <li> <ul> / <li>	Tables <table> <tr> <td> <th> <thead> <tbody> <tfoot> <caption> <colgroup> / <col>
Executable Content <applet> <embed> <noembed> <noscript> <object> <param> <script> <server>	Forms <form> <button> <fieldset> <legend> <label> <input type="button" /> <input type="checkbox" /> <input type="file" /> <input type="hidden" /> <input type="image" /> <input type="password" /> <input type="radio" /> <input type="reset" /> <input type="submit" /> <input type="text" /> <select> <option> <optgroup> <textarea>

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