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Deprecated in HTML5

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:

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: supported in html4.01
HTML5: not supported in html5

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


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