Comparison of layout engines (Non-standard HTML)

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The following tables compare deprecated and proprietary HTML elements and attributes compatibility and support for a number of layout engines. 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, the standards which today are used in most web browsers and web pages were mostly non-existent. Different browsers and HTML editors were being offered by competing vendors such as Netscape, Microsoft and WebTV, all of whom possessed their own ideas for how web sites should be constructed. These varying standards resulted in web developers coding for specific web browsers, using elements which could often be recognized by only one browser.

Explanation of the tables

Engine nomenclature

Rather than the names of web browsers, the names of the underlying engines are used. The browsers that use the various engines are listed below.

Layout engine	Release version	Preview version	Used by
Amaya	11.4.7	N/A	Amaya
Blink	537.36		Chromium/Chrome (28+), Opera (15+) and Yandex
Gecko	26.0	27.0	All Mozilla software, including Firefox; SeaMonkey and Galeon; Camino; K-Meleon; Flock (up to 2.x); Debian IceWeasel; GNU IceCat (formerly GNU IceWeasel); Icedove, Iceape and Iceowl; Fennec. Also used by the Maple platform in 2010 and 2011 Samsung "SmartTV" devices which are based on the build used in Firefox 3.0. Nokia Asha platform is also using Gecko for web apps rendering.
KHTML	4.10.5	N/A	Konqueror
Presto	2.12.388	N/A	Opera; Opera Mobile, Nintendo DS & DSi Browser; Internet Channel
Tasman	(IE 5.2.3 for Mac)	none (aborted in 2003)	Internet Explorer 5+ for Mac OS X
Trident	7.0 (IE 11)	7.0 (IE 11)	Internet Explorer and other Internet Explorer shells like Maxthon (Microsoft Windows operating systems only), Windows Phone 8
WebKit	534.20	r146740	Tizen (both OS and browser), Safari (both desktop and mobile), Google Chrome, Maxthon 3, Shiira, iCab 4, OmniWeb 5.5+, Web, Adobe AIR, Midori, Adobe Dreamweaver CS4 and CS5, Android browser, Palm webOS browser, Symbian S60 browser, OWB, Steam, Rekonq, Arora, Flock (version 3+), RockMelt, Dolphin Browser, Sleipnir, Konqueror, PhantomJS A headless browser for testing, rekonq. Used by the LG Smart TV platform to enable web content on TVs.

Values

Values indicate the level of support in the most recent version of the layout engine, or (if a version number is given) in the specified version. Version numbers without any other value indicate the version at which the layout engine first fully supported the feature.

Value	Meaning
Yes	Indicates that the layout engine fully supports this property/element when valid values are used.
No	Indicates that the property/element is completely ignored.
Partial	Indicates that the property/element is understood, but that not all values are supported. Supported values are implemented correctly.
Incorrect	Indicates that the property/element is understood, but that it is not implemented correctly in all cases.
Experimental	Indicates that the property/element is understood, but supported under an alternate name. May be incomplete or buggy.
Dropped	Indicates that the property/element is no longer supported.
Nightly build	Indicates that the property/element is supported to some extent in an experimental/nightly build. Future support is expected.
Depends	Indicates that the property/element is supported only on certain platforms, or if certain settings are configured.

Deprecated HTML elements

Element	Function	Supported first by	Deprecated in HTML version	Alternative solution	Trident	Gecko	WebKit	KHTML	Presto
<applet>	Insert an applet	HotJava	4	<embed>, <object>	<3.1[IE 4.0]	1.7	Yes	Yes	1.0
<basefont>	Sets font styles	Internet Explorer	4	CSS	<3.1[IE 3.0]	No	85	Yes	Yes
<center>	Centers contents	Netscape	4	CSS	3.1	Yes	Yes	Yes	Yes
<dir>	Directory list	?	4	<ul>, <ol>	3.1	Yes	Yes	Yes	Yes
<font>	Applies font styles	Netscape	4	CSS	3.1	Yes	Yes	Yes	Yes
<isindex>	Adds a search field	?	4	<input type="search">	<3.1[IE 5.5]	1.7	312	Yes	Partial
<listing>	Displays preformatted text	IETF	2	<pre>, <samp>, <code>, CSS	3.1	1.7	125	3.3	Yes
<menu>	Menu list	?	4	<ul>, <ol>	3.1	Yes	Yes	Yes	Yes
<plaintext>	Designates that all HTML be ignored, and to display the page as is	?	3.2	The text/plain MIME type	3.1	Yes	Yes	Yes	Yes
<s>	Strike-through	?	4	<del>, CSS	<3.1[IE 4.0]	1.7	Yes	Yes	1.0
<strike>	Strike-through	?	4	<del>, CSS	<3.1[IE 4.0]	1.7	Yes	Yes	1.0
<u>	Underline	?	4	CSS	<3.1[IE 4.0]	1.7	Yes	Yes	1.0
<xmp>	Similar to <pre> and <plaintext>, but ignores all HTML within and displays as is	?	2	<pre>, <samp>, <code>	<3.1[IE 3.0]	1.7	125	3.3	1.0

Deprecated HTML attributes

Attribute	Element	Alternative solution	Trident	Gecko	WebKit	KHTML	Presto
align	<caption>, <div>, <fieldset>, <h1>, <h2>, <h3>, <h4>, <h5>, <h6>, <hr>, <img>, <input>, <legend>, <p>, <object>, <table>	CSS	3.1	Yes	Yes	Yes	Yes
alink	<body>	CSS	3.1	Yes	No	Yes	Yes
background	<body>	CSS	3.1	Yes	Yes	Yes	Yes
bgcolor	<body>, <table>, <tr>, <td>, <th>	CSS	3.1	Yes	Yes	Yes	Yes
border	<img>, <object>	CSS	3.1	Yes	Partial	Yes	Yes
clear	<br>	CSS	3.1	Yes	No	Yes	Yes
compact	<dl>, <ul>, <ol>	CSS	No	No	No	Yes	Yes
color	<basefont>, <font>	CSS	3.1	Yes	Partial	Yes	Yes
height	<td>, <th>	CSS	3.1	Yes	Yes	Yes	Yes
hspace	<img>, <object>	CSS	3.1	Yes	Yes	Yes	Yes
language	<script>	The type attribute	3.1	No	?	Yes	Yes
link	<body>	CSS	3.1	Yes	Yes	Yes	Yes
noshade	<hr>	CSS	3.1	Yes	Yes	Yes	Yes
nowrap	<td>, <th>	CSS	3.1	Yes	Yes	Yes	Yes
size	<basefont>, <font>, <hr>	CSS	3.1	Yes	Yes	Yes	Yes
text	<body>	CSS	3.1	Yes	Yes	Yes	Yes
type	<li>, <ul>, <ol>	CSS	3.1	Yes	Yes	Yes	Yes
version	<html>	DTD	3.1	Yes	Yes	No	No
vlink	<body>	CSS	3.1	Yes	Yes	Yes	Yes
width	<hr>, <pre>, <td>, <th>	CSS	3.1	Yes	Yes	Yes	Yes
vspace	<img>, <object>	CSS	3.1	Yes	Yes	Yes	Yes

Proprietary HTML elements

Tag	Function	Supported first by	Alternative solution	Trident	Gecko	WebKit	KHTML	Presto
<animate>	Loads a series of images which are then used as a replacement of the throbber animation.	IBM WebExplorer	N/A	No	No	No	No	No
<audioscope>	Used to display the audioscope, a graphical display of sound waves	WebTV	Flash, SVG, Canvas	No	No	No	No	No
<bgsound>	Used to add sound to the background of a website	Internet Explorer	<audio>	<3.1[IE 3.0]	No	No	No	1.0
<blackface>	Used to display text in a double-weight bold font face	WebTV	CSS	No	No	No	No	No
<blink>	Used to display a blinking text	Netscape	Javascript, CSS	No	1.7	No	No	1.0
<bq>	Used to display a blockquote	WebTV, HTML 3.0	<blockquote>	No	No	No	No	No
<comment>	Used to allow the addition of comments to HTML documents	Internet Explorer, WebTV	<!-- ... -->	3.1	No	No	No	No
<fn>	Footnotes	WebTV, HTML 3.0	<a href="#anchor"> combined with <element id="anchor"> where anchor is a valid id	No	No	No	No	No
<hype>	Plays a sound from the Mosaic demo	Mac Netscape 2+	N/A	No	No	No	No	No
<ilayer>	Inline layers	Netscape (4 only)	<iframe>	No	No	No	Partial	No
<image>	Synonym of img	?	<img>	3.1	Yes	Yes	Yes	Yes
<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	No	No	No	Partial	No
<limittext>	Used to set the width of the text display	WebTV	CSS	No	No	No	No	No
<marquee>	Used to display a scrolling, marquee-like text.	Internet Explorer, WebTV	JavaScript, CSS3	3.1	1.7	125	3.3	1.0
<multicol>	Used to format and display multiple columns of text and images	Netscape	CSS3	No	No	No	No	No
<nobr>	Prevents any line breaks from occurring within the flow of a text	?	CSS	3.1	Yes	Yes	Yes	Yes
<noembed>	Displays an alternative text for browsers which do not recognize the embed tag	Netscape	Child elements of object used as fallback	3.1	Yes	Yes	Yes	Yes
<nolayer>	Displays an alternative text for browsers which do not recognize the layer and ilayer elements	Netscape	N/A	3.1	Yes	Yes	Yes	Yes
<nosmartquotes>	Prevents regular single '...' and double "..." quotes from automatically being replaced with smart single ‘...’ and smart double “...” quotes	WebTV	N/A	No	No	No	No	No
<sidebar>	Creates a sidebar window that displays control elements.	WebTV	N/A	No	No	No	No	No
<shadow>	Adds shadow to text	WebTV	CSS3	No	No	No	No	No
<spacer>	Adds whitespace between words	Netscape	CSS, &nbsp;	No	Yes	No	No	No
<sound>	Used to add sound to the background of a website	Mosaic	<audio>	No	No	No	No	No
<wbr>	Placed inside a nobr element to add a line break	?	UTF-8 separator	Dropped	1.7	Yes	3.1	No
<xml>	Delimits an XML data island inside an HTML page	Internet Explorer	?	3.1	No	No	No	No

Proprietary HTML attributes

Attribute	Deprecated for	Function	Supported first by	Trident	Gecko	WebKit	KHTML	Presto
autoactivate	<select>	viewer selects the list, it is activated automatically	WebTV	No	No	No	No	No
bgproperties	<body>	Determines whether background image scrolls with the background	Internet Explorer	3.1	No	Yes	Yes	No
bordercolor	<body>	Sets colors for 3-D table borders in the <table>, <td>, <th>, and <tr> elements	Internet Explorer	3.1	No	No	Yes	No
bordercolordark	<body>	Sets colors for 3-D table borders in the <table>, <td>, <th>, and <tr> elements	Internet Explorer	3.1	No	No	No	No
bordercolorlight	<body>	Sets colors for 3-D table borders in the <table>, <td>, <th>, and <tr> elements	Internet Explorer	3.1	No	No	No	No
controls	<img>	Uses the image tag to place video or audio clips	Internet Explorer	3.1	No	No	No	No
dynsrc	<img>	Uses the image tag to place video or audio clips	Internet Explorer	3.1	?	?	No	No
event	<script>	Defines function to call for an object.	Internet Explorer	3.1	?	?	?	?
for	<script>	Defines the object to bind a scripting event.	Internet Explorer	3.1	?	?	?	?
frame	<table>	Controls the display of the outer borders of a table in the table tag	Internet Explorer	3.1	?	?	Yes	No
framespacing	<frameset>	Sets the amount of space between frames	Internet Explorer	3.1	?	?	No	No
ibmlogo	<img>	used to show some internal mini images	IBM WebExplorer	No	No	No	No	No
internal-gopher-menu	<img>	used to show some internal mini images	IBM WebExplorer	No	No	No	No	No
left_arrow	<img>	used to show some internal mini images	IBM WebExplorer	No	No	No	No	No
leftmargin	<body>	Sets the margin between the browser window and the contents of the page	Internet Explorer	3.1	?	?	Yes	No
loop	<img>	Uses the image tag to place video or audio clips	Internet Explorer	3.1	No	No	No	No
red_bullet	<img>	used to show some internal mini images	IBM WebExplorer	No	No	No	No	No
rightmargin	<body>	Sets the margin between the browser window and the contents of the page	Internet Explorer	3.1	?	?	No	No
start	<img>	Uses the image tag to place video or audio clips	Internet Explorer	3.1	No	No	No	No
target	<form>	Specifies a target window or frame for the output of a form	Internet Explorer	3.1	No	?	Yes	No
usestyle	<caption>	?	WebTV	No	No	No	No	No
valign	<caption>	Sets vertical alignment of table caption	Internet Explorer	3.1	?	?	No	No

See also

• Web standards
• Wireless Markup Language

References

• DevGuru HTML - Non-standard elements
• OS/2 Web Explorer's proprietary HTML elements
• MSDN Handling Events with HTML elements