Unsupported in HTML5

The following tables list the unsupported items in HTML5.

Note: To gather wide acceptance, HTML5 needs to remain backwards compatible with previous versions. Because of this, the HTML5 tags labeled as "deprecated" or "unsupported" are still supported by browsers, but their use by authors is highly discouraged.

HTML5 Unsupported Tags

The following list of elements are not supported in HTML5:

Element	Description
<acronym>	Defines an acronym
<applet>	Defines an embedded applet
<basefont>	Defines a default font-color, font-size, or font-family for all the text in a document
<big>	Defines bigger text
<center>	Defines centered text
<dir>	Defines list directory titles
<font>	Defines the font face, font size, and font color of text
<frame>	Defines a frame within a frameset
<frameset>	Defines a frameset
<noframes>	Used for browsers that do not handle frames
<strike>	Defines strikethrough text
<tt>	Defines teletype text

Within the Quick Guide, if an element is not supported, it will be indicated using the banner shown below:

UNSUPPORTED
in HTML5

HTML5 Unsupported Attributes

The following table lists the removed attributes and the elements from which they have been removed from HTML5:

Removed Attribute	From the Elements
rev	link, a
charset	link, a
shape	a
coords	a
longdesc	img, iframe
target	link
nohref	area
profile	head
version	html
name	img
scheme	meta
archive	object
classid	object
codebase	object
codetype	object
declare	object
standby	object
valuetype	param
type	param
axis	td, th
abbr	td, th
scope	td
align	caption, iframe, img, input, object, legend, table, hr, div, h1, h2, h3, h4, h5, h6, p, col, colgroup, tbody, td, tfoot, th, thead, tr
alink	body
link	body
vlink	body
text	body
background	body
bgcolor	table, tr, td, th, body
border	table, object
cellpadding	table
cellspacing	table
char	col, colgroup, tbody, td, tfoot, th, thead, tr
charoff	col, colgroup, tbody, td, tfoot, th, thead, tr
clear	br
compact	dl, menu, ol, ul
frame	table
frameborder	iframe
height	td, th
hspace	img, object
vspace	img, object
marginheight	iframe
marginwidth	iframe
noshade	hr
nowrap	td, th
rules	table
scrolling	iframe
size	hr
type	li, ol, ul
valign	col, colgroup, tbody, td, tfoot, th, thead, tr
width	hr, table, td, th, col, colgroup, pre

Within the Quick Guide, if an attribute has been removed, it will be indicated as shown in the example below:

Attribute	Value	Description
charset	char_encoding	Specifies the character encoding of the linked document HTML4:  HTML5:

In this example, the "charset" attribute is valid in HTML4, but has been removed from HTML5.