The following tags are permitted for Canvas Pages:

a, abbr, acronym, address, b, bdo, big, blockquote, br, caption, center, cite, code, dd, del, dfn, div, dl, dt, em, fieldset, font, form, h1, h2, h3, h4, h5, h6, hr, i, img, imput, ins, kbd, lable, legend, li, link, meta, ol, optgroup, option, p, pre, q, s, samp, script, select, small, span, strike, strong, style, sub, sup, table, tbody, td, textarea, tfoot, th, thead, tr, tt, u, ul, var

The following tags are permitted for emails:

• Block Line Elements: hr, address, div, h1, h2, h3, h4, h5, h6, p, blockquote, pre
  
• Special Inline Elements: a, area, br, bdo, font, img, map, span
  
• Table Elements:table, th, tr, td, caption, thead, tbody, tfoot, fb:user-table
  
• List Elements:dl, dd, dt, li, ol, ul
  
• Style Elements:

  1. Head elements and attributes: link, meta, style, _style, _imgstyle, _class
     
  2. Text elements: strong, em, b, big, i, ins, u, del, s

  
  
• Form Elements:input, form, option, optgroup, select, textarea, label, fieldset, legend
  
• Phrase Elements:abbr, acronym, cite, dfn, em, kbd, code, samp, strong, var
  
• FBML Link Tags:fb:name, fb:grouplink, fb:eventlink, fb:networklink, fb:user-table
  
• FBML Image Tags: fb:photo, fb:profile-pic
  
• FBML Internationalization Tags:fb:intl, fb:date, fb:intl-token, fb:fbml-attribute, fb:tag, fb:tag-attribute, fb:tag-body

You cannot include the following tags in an app email.

• HTML tags: body, base, iframe, applet, bgsound, blink, char, colgroup, comment, dir, embed, frame, frameset, head, html, hx, ilayer, inlineinput, isindex, keygen, layer, listing, marquee, menu, multicol, nextid, nobr, noembed, noframes, nolayer, noscript, object, plaintext, param, rt, ruby, samp, sound, spacer, spell, wbr, xml, xmp
  
• Script elements and attributes: script, script_onload, _clicktohide, _clicktoshow
  
• Mock AJAX elements and attributes: _clickrewriteurl, _clickrewriteid, _clickrewriteform, flash_autoplay, fb:swf, fb:mp3, fb:flv
  
• Other FBML: fb:iframe, fb:header, fb:dashboard, fb:mediaheader, fb:friend-selector, fb:multi-friend-input, fb:request-form, fb:if-multiple-actors, fb:redirect, fb:tabs, fb:error, fb:success, fb:explanation, fb:editor, fb:share-button, fb:wallpost, fb:message-preview, fb:attachment-preview, fb:comments, fb:google-analytics, fb:random, fb:dialog

You can include only plain text content in Feed/stream stories; they cannot contain any HTML or FBML tags.

However, you can include fb:intl and its child Internationalization tags as well as rich media like images, Flash, and MP3, which get rendered in the attachment parameter that you include when you call stream.publish, Facebook.streamPublish, or FB.Connect.streamPublish.

The following tags are permitted on mobile apps. Please note that you must wrap any mobile content (both XHTML and FBML) in fb:mobile tags.

• Block Level Elements: hr, address, div, h1, h2, h3, h4, h5, h6, p, blockquote, pre
  
• Special Inline Elements: a, br, bdo, img, span
  
• Table Elements: table, th, tr, td, caption, thead, tbody, tfoot, fb:user-table, fb:user-item
  
• List Elements: dl, dd, dt, li, ol, ul
  
• Style Elements:

  1. Head elements and attributes: style, _style, _imgstyle, _class
     
  2. Text elements: strong, em, b, big, i, ins, u, del, s

  
  
• Form Elements: input, form, option, optgroup, select, textarea, label, fieldset, legend, fb:submit
  
• Phrase Elements: abbr, acronym, cite, dfn, em, kbd, code, samp, strong, var
  
• FBML Image Tags: fb:photo, fb:profile-pic
  
• FBML Link Tags: fb:name, fb:grouplink, fb:eventlink, fb:networklink, fb:publisher-link, fb:userlink, fb:user-table
  
• FBML Page Navigation Tags: fb:header, fb:dashboard, fb:mediaheader, fb:tabs
  
• Other FBML Tags: fb:random, fb:wallpost

You can use the fb:request-form tag within the fb:serverFbml tag.

You cannot use the following FBML and XFBML tags within the fb:serverFbml tag:

fb:iframe, fb:mp3