HCard

hCard is a microformat for publishing the contact details (which might be no more than the name) of people, companies, organizations, and places, in (X)HTML, Atom, RSS, or arbitrary XML. The hCard microformat does this using a 1:1 representation of vCard (RFC 2426) properties and values, identified using HTML classes and "rel" attributes.
It allows parsing tools (for example other websites, or Firefox's Operator extension) to extract the details, and display them, using some other websites or mapping tools, index or search them, or to load them into an address-book program.
In May 2009, Google announced that they would be parsing the hCard, hReview and hProduct microformats, and using them to populate search-result pages. In September 2010 Google announced their intention to surface hCard, hReview information in their local search results. In February 2011, Facebook began using hCard to mark up event venues.
Example.
Consider the HTML:
<ul>
 <li>Joe Doe</li>
 <li>Jo</li>
 <li>The Example Company</li>
 <li>604-555-1234</li>
 <li><a href="http://example.com/">http://example.com/</a></li>
</ul>
With microformat markup, that becomes:
<link rel="profile" href="http://microformats.org/profile/hcard">
</head>
<ul class="vcard">
 <li class="fn">Joe Doe</li>
 <li class="nickname">Jo</li>
 <li class="org">The Example Company</li>
 <li class="tel">604-555-1234</li>
 <li><a class="url" href="http://example.com/">http://example.com/</a></li>
</ul>
Here the properties "fn", nickname, "org" (organization), "tel" (telephone number) and "url" (web address) have been identified using specific class names; and the whole thing is wrapped in codice_1 which indicates that the other classes form an hcard, and are not just coincidentally named. If the hCard is for an organization or venue, the "fn" and "org" classes are used on the same element, as in codice_2 or codice_3. Other, optional, hCard classes also exist.
It is now possible for software, for example browser plug-ins, to extract the information, and transfer it to other applications, such as an address book.
Geo and adr.
The Geo microformat is a part of the hCard specification, and is often used to include the coordinates of a location within an hCard.
The "adr" part of hCard can also be used as a stand-alone microformat.
Live example.
Here are the Wikimedia Foundation's contact details as of September 2017, as a live hCard:
Wikimedia Foundation Inc.
149 New Montgomery Street, 3rd Floor
 San Francisco, CA 94105
USA
Phone: +1-415-839-6885
Email: info@wikimedia.org
Fax: +1-415-882-0495
The mark-up (wrapped for clarity) used is:
<div class="vcard">
 <div class="fn org">Wikimedia Foundation Inc.</div>
 <div class="adr">
 <div class="street-address">149 New Montgomery Street, 3rd Floor</div>
 <div> <span class="locality">San Francisco</span>, <abbr class="region" title="California">CA</abbr> <span class="postal-code">94105</span></div>
 <div class="country-name">USA</div>
 </div>
 <div>Phone: <span class="tel">+1-415-839-6885</span></div>
 <div>Email: <span class="email">info@wikimedia.org</span></div>
 <div class="tel">
 <span class="type">Fax</span>:
 <span class="value">+1-415-882-0495</span>
 </div>
</div>
Note that, in this example, the "fn" and "org" properties are combined on one element, indicating that this is the hCard for an organization, not a person.
Other attributes.
Other commonly used hCard attributes include