The HTML Code Element (<code>) represents a fragment of computer code. By default, it is displayed in the browser's default monospace font.
The HTML Table Column Element (<col>) defines a column within a table and is used for defining common semantics on all common cells. It is generally found within a <colgroup> element.
The HTML Table Column Group Element (<colgroup>) defines a group of columns within a table.
The HTML <data> Element links a given content with a machine-readable translation. If the content is time- or date-related, the <time> must be used.
The HTML Definition Element (<dfn>) represents the defining instance of a term.
The HTML <dialog> element represents a dialog box or other interactive component, such as an inspector or window. <form> elements can be integrated within a dialog by specifying them with the attribute method="dialog". When such a form is submitted, the dialog is closed with a returnValue attribute set to the value of the submit button used.
The HTML element emphasis  <em> marks text that has stress emphasis. The <em> element can be nested, with each level of nesting indicating a greater degree of emphasis.
The HTML <fieldset> element is used to group several controls as well as labels (<label>) within a web form.
The HTML <form> element represents a document section that contains interactive controls to submit information to a web server.
The HTML Keyboard Input Element (<kbd>) represents user input and produces an inline element displayed in the browser's default monospace font.
The HTML <link> element specifies relationships between the current document and an external resource. Possible uses for this element include defining a relational framework for navigation. This Element is most used to link to style sheets.
The HTML <map> element is used with <area> elements to define an image map (a clickable link area).
The HTML <menu> element represents a group of commands that a user can perform or activate. This includes both list menus, which might appear across the top of a screen, as well as context menus, such as those that might appear underneath a button after it has been clicked.
The HTML <meta> element represents any metadata information that cannot be represented by one of the other HTML meta-related elements (<base>, <link>, <script>, <style> or <title>).
<q>
The HTML Quote Element (<q>) indicates that the enclosed text is a short inline quotation. This element is intended for short quotations that don't require paragraph breaks; for long quotations use <blockquote> element.
The HTML <rp> element is used to provide fall-back parenthesis for browsers non-supporting ruby annotations. Ruby annotations are for showing pronunciation of East Asian characters, like using Japanese furigana or Taiwainese bopomofo characters. The <rp> element is used in the case of lack of <ruby> element support its content has what should be displayed in order to indicate the presence of a ruby annotation, usually parentheses.
The HTML <rt> Element embraces pronunciation of characters presented in a ruby annotations, which are used to describe the pronunciation of East Asian characters. This element is always used inside a <ruby> element.
The HTML <rtc> Element embraces semantic annotations of characters presented in a ruby of <rb> elements used inside of <ruby> element. <rb> elements can have both pronunciation (<rt>) and semantic (<rtc>) annotations.
The HTML <ruby> Element represents a ruby annotation. Ruby annotations are for showing pronunciation of East Asian characters.
The HTML <samp> element is an element intended to identify sample output from a computer program. It is usually displayed in the browser's default monotype font (such as Lucida Console).