From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <em> <strong> <dfn> <code> <samp> <kbd> <var> <cite> tags

Definition and Usage

The following elements are all phrase elements. They are not deprecated, but it is possible to achieve a much richer effect using style sheets.

<em>	Renders as emphasized text
<strong>	Defines important text
<dfn>	Defines a definition term
<code>	Defines computer code text
<samp>	Defines sample computer code
<kbd>	Defines keyboard text
<var>	Defines a variable
<cite>	Defines a citation

Differences Between HTML 4.01 and HTML 5

In HTML 4.01, the <strong> tag defined strong emphasized text, but in HTML 5 it defines important text.

Example

Source	Output
<em>Emphasized text</em><br /> <strong>Strong text</strong><br /> <dfn>Definition term</dfn><br /> <code>Computer code text</code><br /> <samp>Sample computer code text</samp><br /> <kbd>Keyboard text</kbd><br /> <var>Variable</var><br /> <cite>Citation</cite>	Emphasized text Strong text Definition term `Computer code text` `Sample computer code text` `Keyboard text` `Variable` Citation

Standard Attributes

class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title

For a full description, go to Standard Attributes in HTML 5.

Event Attributes

onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload

For a full description, go to Event Attributes in HTML 5.

Try-It-Yourself Demos

Text formatting
This example demonstrates how you can format text in a document.

"Computer output" tags
Demonstrates how different "computer output" tags will be displayed.