The HTML <ol> Element (or HTML Ordered List Element) represents an ordered list of items. Typically, ordered-list items are displayed with a preceding numbering, which can be of any form, like numerals, letters or Romans numerals or even simple bullets. This numbered style is not defined in the HTML description of the page, but in its associated CSS, using the list-style-type property.
The HTML Plaintext Element (<plaintext>) renders everything following the start tag as raw text, without interpreting any HTML. There is no closing tag, since everything after it is considered raw text.
The HTML <pre> element (or HTML Preformatted Text) represents preformatted text. Text within this element is typically displayed in a non-proportional ("monospace") font exactly as it is laid out in the file. Whitespace inside this element is displayed as typed.
<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).
The HTML <source> element specifies multiple media resources for either the <picture>, the <audio> or the <video> element. It is an empty element. It is commonly used to serve the same media content in multiple formats supported by different browsers.
The HTML Subscript Element (<sub>) defines a span of text that should be displayed, for typographic reasons, lower, and often smaller, than the main span of text.
The HTML Superscript Element (<sup>) defines a span of text that should be displayed, for typographic reasons, higher, and often smaller, than the main span of text.
The HTML Table Element (<table>) represents tabular data - i.e., information expressed via a two dimensional data table.
The HTML Table Body Element (<tbody>) defines one or more <tr> element data-rows to be the body of its parent <table> element (as long as no <tr> elements are immediate children of that table element.)  In conjunction with a preceding <thead> and/or <tfoot> element, <tbody> provides additional semantic information for devices such as printers and displays. Of the parent table's child elements, <tbody> represents the content which, when longer than a page, will most likely differ for each page printed; while the content of <thead> and <tfoot> will be the same or similar for each page printed. For displays, <tbody> will enable separate scrolling of the <thead>, <tfoot>, and <caption> elements of the same parent <table> element.  Note that unlike the <thead>, <tfoot>, and <caption> elements however, multiple <tbody> elements are permitted (if consecutive), allowing the data-rows in long tables to be divided into different sections, each separately formatted as needed.
The Table cell HTML element (<td>) defines a cell of a table that contains data. It participates in the table model.
The HTML Table Foot Element (<tfoot>) defines a set of rows summarizing the columns of the table.
The HTML element table header cell <th> defines a cell as header of a group of table cells. The exact nature of this group is defined by the scope and headers attributes.
The HTML Table Head Element (<thead>) defines a set of rows defining the head of the columns of the table.
The HTML <time> element represents either a time on a 24-hour clock or a precise date in the Gregorian calendar (with optional time and timezone information).
The HTML element table row <tr> defines a row of cells in a table. Those can be a mix of <td> and <th> elements.