HTML and CSS Reference
In-Depth Information
• The closing tag for the <p> tag is optional under the HTML specification; however,
under the XHTML 1.0 specification, the closing tag </p> is required for XHTML
• As a logical element, empty paragraphs are ignored by browsers, so do not try to
use multiple <p> tags in a row, like <p><p><p><p> , to add blank lines to a Web
• Often, nonbreaking space entities are used to hold open empty paragraphs, like so:
<p>&nbsp;</p> . The value of this markup is questionable.
• The HTML 3.2 specification supports only the align attribute with values of
center , left , and right .
• The HTML 2.0 specification supports no attributes for the p element.
<param> (Object Parameter)
This element specifies a parameter to be passed to an embedded object that is specified with
the object or applet element. This element should occur only within the scope of one of
these elements.
Standard Syntax
id="unique alphanumeric identifier"
name="parameter name"
type="mime Type"
value="parameter value"
valuetype="data | object | ref">
Attributes Introduced by HTML5
accesskey="spaced list of accelerator key(s)"
contenteditable="true | false | inherit"
contextmenu="id of menu"
data-X="user-defined data"
draggable="true | false | auto"
itemid="microdata id in URL format"
itemprop="microdata value"
itemref="space-separated list of IDs that may contain microdata"
itemtype="microdata type in URL format"
spellcheck="true | false"
Attributes Defined by Internet Explorer
datafld="column name" (4)
dataformatas="html | text" (4)
datasrc="data source id" (4)
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