Unusual HTML tags


 * definition : definition
 * cite : citation


 * pre
 * : code
 * kbd : computer input
 * sample : computed output
 * variable : the name of a variable.


 * ins : inserted text
 * del : deleted text
 * Defines emphasized text
 * Defines text that is no longer correct
 * Defines strikethrough text

Invalid tags

 * Defines contact information for the author/owner of a document
 * Defines an article
 * Defines content aside from the page content
 * Isolates a part of text that might be formatted in a different direction from other text outside it
 * Overrides the current text direction
 * Defines additional details that the user can view or hide
 * Defines a dialog box or window
 * Specifies self-contained content
 * Defines a footer for a document or section
 * Defines a header for a document or section
 * Specifies the main content of a document
 * Defines marked/highlighted text
 * Defines a scalar measurement within a known range (a gauge)
 * Defines navigation links
 * Defines the result of a calculation
 * Defines a container for multiple image resources
 * Represents the progress of a task
 * Defines a section in a document
 * Defines a container for SVG graphics
 * Defines a template
 * Defines a date/time
 * Defines a video or movie
 * Defines a possible line-break
 * Defines a possible line-break