The <bdi> element is used to isolate a small section of text which may be formatted to run in the opposite direction than the text around it (such as right-to-left in a left-to-right context). This is useful when a language with right-to-left directionality, such as Arabic or Hebrew, is used inline with left-to-right languages.
The <del> tag is used to identify text that has been deleted from a document but retained to show the history of modifications made to the document. Pair a <del> element with an <ins> element to identify the inserted text that replaced the deleted text.
The <tt> element was used to identify text to be displayed using the browser's default monospace or fixed-width font as it would appear on a fixed-width device such as a teletype. This element has been deprecated and the <code> element is an appropriate modern replacement for <tt>.
The <u> element was originally used to identify text that should be underlined. The element was deprecated in HTML 4.01, but in HTML5 it was redefined to represent text that should be displayed in a way that is an unarticulated but stylistically distinct from the surrounding text. For example, one proper use of the <u> element is to identify misspelled terms.
The <ul> element is used to define an unordered list of items. Use an unordered list to contain <li> elements that do not need to be presented in numerical order and can be rearranged without changing the meaning of the list.
The <wbr> element is used to define a word break opportunity in a string of text. It is particularly useful when you wish to define word break opportunities in a long unbroken string of text that might otherwise break improperly.
The <th> element is used to identify table cells that contain column header values rather than table data. A row of table heading values is created by nesting multiple <th> values in a parent <tr> element.
The <title> element is a required HTML element used to assign a title to an HTML document. Page titles are not displayed in the browser window, but they are used as the page name by search engines and displayed by browsers in the title bar, on the page tab, and as the page name of bookmarked webpages.