<main>

Specifies the main content of a document

<map>

Defines an image map

<mark>

Defines marked/highlighted text

<meta>

Defines metadata about an HTML document

<meter>

Defines a scalar measurement within a known range (a gauge)

<nav>

Defines navigation links

<noframes>

Defines an alternate content for users that do not support frames

<noscript>

Defines an alternate content for users that do not support client-side scripts

<object>

Defines a container for an external application

<ol>

Defines an ordered list

<optgroup>

Defines a group of related options in a drop-down list

<option>

Defines an option in a drop-down list