# Headings

Elements h1, h2, h3, h4, h5, h6 make up the heading content category.

hgroup groups a primary heading with one or more p subtitle elements:

abbr: Some vehicles meet the SULEV standard.
br was used to make this sentence start on a new line.

bdi: Some languages read right to left, مرحبا. bdo: The normal direction has been overridden.

em is used for emphasis and usually renders as italics, contrast that with i which is used for alternate voice or to offset from the normal (such as a phrase from a different language or taxonomic designation): E. coli can be bad. strong is used for importance or urgency and usually renders as bold, contrast that with b which is used to draw attention without the semantic meaning of importance.

cite: In the words of Charles Bukowski — An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way.

data can be used to specify 5 A.M. that is machine-readable, but time is a better choice for specifying 5 A.M. in a machine-readable format.

del can be varily used to mark deletions. ins marks insertions. s: similar to del, but used to mark content that is no longer relevant. Windows XP version available. u: a holdover with no real meaning that should be removed. mark: the HTML equivalent of the yellow highlighter. span: a generic element with no meaning by itself.

dfn: Foreign phrases add a certain je ne sais quoi to one's prose.

q: The W3C page About W3C says the W3C's mission is To lead the World Wide Web to its full potential by developing protocols and guidelines that ensure long-term growth for the Web.

kbd and samp: I did this:

c:\>format c: /yes

Is that bad? Press Ctrl+F5 for a hard reload.

var: To log in, type ssh user@example.com, where user is your user ID.

meter and progress: Storage space usage: 6 blocks used (out of 8 total) Progress: 37%

sub is used for subscripts: H₂O. sup is used for superscripts: E = MC². small is used for side comments: I wrote this whole document. [Editor's note: no he did not] wbr: used to specify where a word may break and it is supercalifragilisticexpialidocious.

a: Example.

address:

blockquote:

I quickly explained that many big jobs involve few hazards

This is a multi-line blockquote with a cite reference. People think focus means saying yes to the thing you've got to focus on. But that's not what it means at all. It means saying no to the hundred other good ideas that there are. You have to pick carefully. I'm actually as proud of the things we haven't done as the things I have done. Innovation is saying no to 1,000 things.

details and summary:

dialog: The dialog element represents a dialog box or other interactive component. Use the open attribute to show it inline; use .show() or .showModal() via JavaScript for programmatic control.

dl:

Definition List Title

Definition list division.

Kitchen Sink

Used in expressions to describe work in which all conceivable (and some inconceivable) sources have been mined. In this case, a bunch of markup.

aside

Defines content aside from the page content

blockquote

Defines a section that is quoted from another source

figure:

# Forms

output:

ul and ol:

• Unordered List item one
  • Nested list item
    • Level 3, item one
    • Level 3, item two
    • Level 3, item three
    • Level 3, item four
  • List item two
  • List item three
  • List item four
• List item two
• List item three
• List item four

1. List item one
   1. List item one
      1. List item one
      2. List item two
      3. List item three
      4. List item four
   2. List item two
   3. List item three
   4. List item four
2. List item two
3. List item three
4. List item four

menu: Semantically equivalent to ul, but intended for a list of interactive items such as toolbar buttons.

menuitem is deprecated and non-standard. It was originally conceived as a child of <menu type="context"> or <menu type="toolbar"> to declare individual commands — analogous to how <option> works inside <select>. The element was removed from the HTML living standard before reaching broad browser support; only Firefox ever implemented it, and that support was subsequently dropped. Do not use menuitem. Use <button> or <li> elements inside <menu> instead.

<!-- obsolete: do not use -->
<menu type="context">
  <menuitem label="Refresh" onclick="..."></menuitem>
  <menuitem label="Save" onclick="..."></menuitem>
</menu>

pre:

pre {
display: block;
padding: 7px;
background-color: #F5F5F5;
border: 1px solid #E1E1E8;
border-radius: 3px;
white-space: pre-wrap;
word-break: break-all;
font-family: Menlo, Monaco;
line-height: 160%;
}

You are in an open field west of a big white house with a boarded
front door.
There is a small mailbox here.

> open mailbox

Opening the mailbox reveals:
A leaflet.

>

# Tables

In the following table, characteristics are given in the second column, with the negative side in the left column and the positive side in the right column.

template: The template element holds inert HTML that is not rendered on page load. Its content does not display, scripts inside it do not run, and images do not load until the template is cloned and inserted via JavaScript.

audio: By Cqdx [CC BY-SA 3.0], from Wikimedia Commons.

iframe:

img:

map and area: An image map with four clickable quadrants defined by area elements.

math:

picture:

svg:

object:

video: