The following tables compare deprecated and proprietary HTML

HTML

HyperText Markup Language is the predominant markup language for web pages. HTML elements are the basic building-blocks of webpages....

 elements and attributes compatibility and support for a number of layout engine

Layout engine

A web browser engine, , is a software component that takes marked up content and formatting information and displays the formatted content on the screen. It "paints" on the content area of a window, which is displayed on a monitor or a printer...

s. Please see the individual products' articles for further information. This article is not all-inclusive or necessarily up-to-date. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions or external programs.

In the early years of the World Wide Web

World Wide Web

The World Wide Web is a system of interlinked hypertext documents accessed via the Internet...

, the standards which today are used in most web browser

Web browser

A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier and may be a web page, image, video, or other piece of content...

s and web page

Web page

A web page or webpage is a document or information resource that is suitable for the World Wide Web and can be accessed through a web browser and displayed on a monitor or mobile device. This information is usually in HTML or XHTML format, and may provide navigation to other web pages via hypertext...

s were mostly non-existent. Different browsers and HTML editors were being offered by competing vendors such as Netscape

Netscape

Netscape Communications is a US computer services company, best known for Netscape Navigator, its web browser. When it was an independent company, its headquarters were in Mountain View, California...

, Microsoft

Microsoft

Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...

 and WebTV, all of whom had their own ideas for how web sites should be constructed. These varying features resulted in web developers coding for specific web browsers, using elements which could often be recognized by only one browser.

The WebTV and IBM WebExplorer inventions have never seen adoption by mainstream browsers.

Deprecated HTML elements

Element	Function	Supported first by	Deprecated in HTML version	Alternative solution	Trident Trident (layout engine) Trident is the name of the layout engine for the Microsoft Windows version of Internet Explorer.It was first introduced with the release of Internet Explorer version 4.0 in October 1997; it has been steadily upgraded and remains in use today...	Gecko Gecko (layout engine) Gecko is a free and open source layout engine used in many applications developed by Mozilla Foundation and the Mozilla Corporation , as well as in many other open source software projects....	WebKit WebKit WebKit is a layout engine designed to allow web browsers to render web pages. WebKit powers Google Chrome and Apple Safari and by October 2011 held over 33% of the browser market share between them. It is also used as the basis for the experimental browser included with the Amazon Kindle ebook...	KHTML KHTML KHTML is the HTML layout engine developed by the KDE project. It is the engine used by the Konqueror web browser. A forked version of KHTML called WebKit is used by several web browsers, among them Safari and Google Chrome...	Presto Presto (layout engine) Presto is the layout engine for later versions of the Opera web browser . After several public betas and technical previews, it was released on January 28, 2003 in Opera 7 for Windows, and as of Opera 11 it is still in use. Presto is dynamic: the page or parts of it can be re-rendered in response...
applet	Insert an applet	HotJava HotJava HotJava was a modular, extensible web browser from Sun Microsystems implemented in Java. It was the first browser to support Java applets, and was Sun's demonstration platform for the then new technology. It has since been discontinued and is now no longer supported...	4	embed, object				rowspan="6"
basefont	Sets font styles	Internet Explorer	4	CSS				rowspan="4"
center	Centers contents	Netscape	4	CSS	rowspan="3"	rowspan="3"	rowspan="3"
dir	Directory list	?	4	ul, ol
font	Applies font styles	Netscape	4	CSS
isindex	Adds a search field	?	4	input type="search"		rowspan="2"
listing	Displays preformatted text	IETF	2	pre, samp, code, CSS	rowspan="3"			rowspan="3"
menu	Menu list	?	4	ul, ol	rowspan="2"	rowspan="5"	rowspan="5"
plaintext	Designates that all HTML be ignored, and to display the page as is	?	3.2	The text/plain MIME type
s	Strike-through	?	4	del, CSS	rowspan="3"	rowspan="4"	rowspan="4"
strike	Strike-through	?	4	del, CSS
u	Underline	?	4	CSS
xmp	Similar to pre and plaintext, but ignores all HTML within and displays as is	?	2	pre, samp, code

Deprecated HTML attributes

Attribute	Element	Alternative solution	Trident Trident (layout engine) Trident is the name of the layout engine for the Microsoft Windows version of Internet Explorer.It was first introduced with the release of Internet Explorer version 4.0 in October 1997; it has been steadily upgraded and remains in use today...	Gecko Gecko (layout engine) Gecko is a free and open source layout engine used in many applications developed by Mozilla Foundation and the Mozilla Corporation , as well as in many other open source software projects....	WebKit WebKit WebKit is a layout engine designed to allow web browsers to render web pages. WebKit powers Google Chrome and Apple Safari and by October 2011 held over 33% of the browser market share between them. It is also used as the basis for the experimental browser included with the Amazon Kindle ebook...	KHTML KHTML KHTML is the HTML layout engine developed by the KDE project. It is the engine used by the Konqueror web browser. A forked version of KHTML called WebKit is used by several web browsers, among them Safari and Google Chrome...	Presto Presto (layout engine) Presto is the layout engine for later versions of the Opera web browser . After several public betas and technical previews, it was released on January 28, 2003 in Opera 7 for Windows, and as of Opera 11 it is still in use. Presto is dynamic: the page or parts of it can be re-rendered in response...
align	caption, div, fieldset, h1, h2, h3, h4, h5, h6, hr, img, input, legend, p, object, table	CSS	rowspan="6"	rowspan="6"		rowspan="18"	rowspan="18"
alink	body	CSS
background	body	CSS	rowspan="2"
bgcolor	body, table, tr, td, th	CSS
border	img, object	CSS	Supported for only img.
clear	br	CSS	rowspan="2"
compact	dl, ul, ol	CSS
color	basefont, font	CSS	rowspan="11"		Supported for only font.
height	td, th	CSS	rowspan="2"	rowspan="10"
hspace	img, object	CSS
language	script	The type attribute
link	body	CSS	rowspan="7"
noshade	hr	CSS
nowrap	td, th	CSS
size	basefont, font, hr	CSS
start	ol	None
text	body	CSS
type	li, ul, ol	CSS
version	html	DTD Document Type Declaration A Document Type Declaration, or DOCTYPE, is an instruction that associates a particular SGML or XML document with a Document Type Definition...
vlink	body	CSS	rowspan="3"	rowspan="3"	rowspan="3"	rowspan="3"	rowspan="3"
width	hr, pre, td, th	CSS
vspace	img, object	CSS

Proprietary HTML elements

Tag	Function	Supported first by	Alternative solution	Trident Trident (layout engine) Trident is the name of the layout engine for the Microsoft Windows version of Internet Explorer.It was first introduced with the release of Internet Explorer version 4.0 in October 1997; it has been steadily upgraded and remains in use today...	Gecko Gecko (layout engine) Gecko is a free and open source layout engine used in many applications developed by Mozilla Foundation and the Mozilla Corporation , as well as in many other open source software projects....	WebKit WebKit WebKit is a layout engine designed to allow web browsers to render web pages. WebKit powers Google Chrome and Apple Safari and by October 2011 held over 33% of the browser market share between them. It is also used as the basis for the experimental browser included with the Amazon Kindle ebook...	KHTML KHTML KHTML is the HTML layout engine developed by the KDE project. It is the engine used by the Konqueror web browser. A forked version of KHTML called WebKit is used by several web browsers, among them Safari and Google Chrome...	Presto Presto (layout engine) Presto is the layout engine for later versions of the Opera web browser . After several public betas and technical previews, it was released on January 28, 2003 in Opera 7 for Windows, and as of Opera 11 it is still in use. Presto is dynamic: the page or parts of it can be re-rendered in response...
bgsound	Used to add sound to the background of a website	Internet Explorer	audio
blink	Used to display a blinking text	Netscape Netscape Netscape Communications is a US computer services company, best known for Netscape Navigator, its web browser. When it was an independent company, its headquarters were in Mountain View, California...	Javascript, CSS
bq	Used to display a blockquote Blockquote In HTML and XHTML, the blockquote element defines a block quotation within the text. The syntax is <blockquote><p>blockquoted text goes here</p></blockquote>....	WebTV, HTML 3.0	blockquote
comment	Used to allow the addition of comments to HTML documents	Internet Explorer, WebTV	<!-- ... -->
ilayer	Inline layers	Netscape (4 only)	iframe
image	Synonym of img	?	img
layer	Used to create multiple layers of text and images which lay on top of each other in a given order	Netscape (4 only)	CSS, AJAX Ajax (programming) Ajax is a group of interrelated web development methods used on the client-side to create asynchronous web applications...
marquee	Used to display a scrolling, marquee-like text.	Internet Explorer, WebTV	JavaScript, CSS3
nobr	Prevents any line breaks from occurring within the flow of a text	Netscape	CSS	rowspan="2"	rowspan="2"	rowspan="2"	rowspan="2"	rowspan="2"
noembed	Displays an alternative text for browsers which do not recognize the embed tag	Netscape	Child elements of object used as fallback
spacer	Adds whitespace in a layout	Netscape	CSS
wbr	Placed inside a nobr element to add a line break	Netscape	Unicode character zero-width space Zero-width space The zero-width space is a non-printing character used in computerized typesetting to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing, or after characters that are not followed by a visible space but after which there may nevertheless be a...
xml	Delimits an XML data island inside an HTML page	Internet Explorer	?

Proprietary HTML attributes

Attribute	Deprecated for	Function	Supported first by	Trident Trident (layout engine) Trident is the name of the layout engine for the Microsoft Windows version of Internet Explorer.It was first introduced with the release of Internet Explorer version 4.0 in October 1997; it has been steadily upgraded and remains in use today...	Gecko Gecko (layout engine) Gecko is a free and open source layout engine used in many applications developed by Mozilla Foundation and the Mozilla Corporation , as well as in many other open source software projects....	WebKit WebKit WebKit is a layout engine designed to allow web browsers to render web pages. WebKit powers Google Chrome and Apple Safari and by October 2011 held over 33% of the browser market share between them. It is also used as the basis for the experimental browser included with the Amazon Kindle ebook...	KHTML KHTML KHTML is the HTML layout engine developed by the KDE project. It is the engine used by the Konqueror web browser. A forked version of KHTML called WebKit is used by several web browsers, among them Safari and Google Chrome...	Presto Presto (layout engine) Presto is the layout engine for later versions of the Opera web browser . After several public betas and technical previews, it was released on January 28, 2003 in Opera 7 for Windows, and as of Opera 11 it is still in use. Presto is dynamic: the page or parts of it can be re-rendered in response...
bgproperties	body	Determines whether background image scrolls with the background	Internet Explorer	rowspan="10"
bordercolor	body	Sets colors for 3-D table borders in the table, td, th, and tr elements	Internet Explorer
bordercolordark	body	Sets colors for 3-D table borders in the table, td, th, and tr elements	Internet Explorer	rowspan="2"	rowspan="2"	rowspan="2"	rowspan="2"
bordercolorlight	body	Sets colors for 3-D table borders in the table, td, th, and tr elements	Internet Explorer
controls	img	Uses the img element to place video or audio clips	Internet Explorer
dynsrc	img	Uses the img element to place video or audio clips	Internet Explorer
event	script	Defines function to call for an object.	Internet Explorer		?	?	?
for	script	Defines the object to bind a scripting event.	Internet Explorer		?	?	?
frame	table	Controls the display of the outer borders of a table in the table tag	Internet Explorer		?
framespacing	frameset	Sets the amount of space between frames	Internet Explorer	?	?
leftmargin	body	Sets the margin between the browser window and the contents of the page	Internet Explorer	rowspan="2"	?	?
loop	img	Uses the img element to place video or audio clips	Internet Explorer
rightmargin	body	Sets the margin between the browser window and the contents of the page	Internet Explorer	rowspan="3"	?	?
start	img	Uses the img element to place video or audio clips	Internet Explorer
target	form	Specifies a target window or frame for the output of a form	Internet Explorer		?
valign	caption	Sets vertical alignment of table caption	Internet Explorer		?	?