HTML and CSS Reference
This chapter presents the various elements of the HTML language. his
includes the syntax of character entities and markup tags and how a
browser or other user agent interprets the markup to display a page.
his description follows the drat speciication for HTML5 developed by the
World Wide Web Consortium's (W3C) HTML Working Group. In general, the
term “HTML” is used to describe elements of the language in general use that
are currently supported by modern browsers. he term “HTML5” is used to
describe elements that are new in the HTML5 drat speciication and that may
or may not be supported by a speciic browser.
A page on the World Wide Web is composed of a set of iles stored somewhere
on a device accessible to a web server. he exact location of a page is known
by its URL (Uniform Resource Locator). A web page has content consisting
of text, inline images, and embedded media objects. he page's marked-up
text is in one ile, and the individual images and media objects are in separate
iles. Images and media objects are also referenced by their URLs, so the same
objects can be used more than once on a page or on many diferent pages.
Video and audio objects are supported directly by HTML5. Other multimedia
is accessed through plug-ins or external helper applications that the browser
associates with the content type of the media object. he documentation or
online help for a speciic browser lists the recommended helper applications
appropriate to a speciic operating system.