The following tables compare HTML 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.
Only HTML 4 and XHTML 1.0 served as text/html (so called "HTML compatible" XHTML) are considered. XHTML 1.0 Strict is necessarily XHTML 1.1 with fewer elements and attributes deprecated. XHTML 2.0 is not considered as it is a redefinition of XHTML, which is not backward compatible. For more XHTML-related comparisons, please refer to comparison of layout engines (XHTML).
Version number, if possible, is provided for feature that is fully supported (based on HTML 4.01). Proprietary extensions are not included.
W3C deprecated tags and attributes and proprietary tags are compared in comparison of layout engines (Non-standard HTML).
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 | 11.3.1 | 11.3-pre | Amaya |
|---|
| Gecko | 19.0 | 20.0 | 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. |
|---|
| KHTML | | N/A | Konqueror† |
|---|
| Presto | 2.10.229 | 2.10.238 | 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 | 6.0 (IE 10) | 6.0 (IE 10) | 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†, rekonq. Used by the LG Smart TV platform to enable web content on TVs. |
|---|
† In Konqueror, the user can switch layout engine.
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. |
Global structure elements
The global structure of the document.
| Trident | Tasman | Gecko | WebKit | KHTML | Presto | iCab |
|---|
| Basic structure |
|---|
| html | <3.1[IE 5.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| head | <3.1[IE 4.0] |
| body |
| Metadata |
|---|
| title | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| meta |
| Headings |
|---|
| h1 | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| h2 |
| h3 |
| h4 |
| h5 |
| h6 |
| Grouping elements |
|---|
| div | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| span |
Text elements
Elements that represent text.
| Trident | Tasman | Gecko | WebKit | KHTML | Presto | iCab |
|---|
| Phrase |
|---|
| em | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| strong |
| dfn |
| code |
| samp |
| kbd |
| var |
| cite |
| acronym |
| abbr | 3.1 |
| Quotations |
|---|
| blockquote | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| q | 4.0 | 1.8[note 1] |
| Subscripts and superscripts |
|---|
| sub | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| sup |
| Lines and paragraphs |
|---|
| p | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| pre |
| br | <3.1[IE 5.0] |
| Marking document changes |
|---|
| ins | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| del |
List elements
Elements that represent lists of information.
Table elements
Elements that represent tabular information.
| Trident | Tasman | Gecko | WebKit | KHTML | Presto | iCab |
|---|
| Basic table elements |
|---|
| table | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| caption |
| tr |
| th |
| td |
| Row groups |
|---|
| thead | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| tbody |
| tfoot | ? |
| Column groups |
|---|
| colgroup | <3.1[IE 4.0] | ? | 1.0 | Yes | Yes | 1.0 | Yes |
| col |
Link elements
Hyperlinks, one of the primary forces driving the success of the World Wide Web.
Multimedia elements
Multimedia features including images, applets, video clips, and other HTML documents.
Frame elements
Elements to present documents in multiple views, which may be independent windows or subwindows. Frame layout is only available in the frameset profiles. All frames are not available in XHTML 1.1 (use generic object elements instead for inline frames).
Form elements
The user interface controls for interacting with the web server.
| Trident | Tasman | Gecko | WebKit | KHTML | Presto | iCab |
|---|
| Basic structure |
|---|
| form | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| fieldset |
| legend |
| Form controls and labels |
|---|
| button | <3.1[IE 4.0] [note 3] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| textarea | <3.1[IE 4.0] |
| input |
| label | 3.4.2[note 4] |
| List boxes (combo boxes) |
|---|
| select | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| optgroup |
| option |
Presentational elements
Elements that specify presentational information. Although not all elements are deprecated, their use is discouraged in favor of stylesheets. Deprecated elements are not available in the strict profiles and XHTML 1.1.
Stylesheet elements
The ways to apply stylesheets (CSS) to the document.
Script elements
Elements for embedding client-side script (JavaScript). See also DOM Events for a list of attributes used to attach an event handler to an element.
Language elements
Elements related to language information.
Generic attributes
Attributes that can be used in any elements.
| Trident | Tasman | Gecko | WebKit | KHTML | Presto | iCab |
|---|
| Element identifiers |
|---|
| id | <3.1[IE 3.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| class |
| Inline styles |
|---|
| style | <3.1[IE 3.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| Advisory information |
|---|
| title | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| Language information |
|---|
| lang | <3.1[IE 4.0] | Yes | 1.0 | Yes | Yes | 1.0 | Yes |
| dir | <3.1[IE 5.0] |
Notes
- ^
<q> does not support nested quotes prior to Gecko 1.8.[1] - ^ For images, a frame will be added to the object. Other content types are not supported and the element is incorrectly implemented as an ActiveX wrapper. Nested objects fallback mechanism is not supported prior to version 7.[2]
- ^ Prior to Internet Explorer 8.0 (trident 4.0), and in earlier compatibility modes, the innerText is submitted instead of the value attribute.[3]
- ^
<label> was focusable prior to KHTML 3.4.2.[citation needed] - ^ Internet Explorer 9 (trident 5.0) and earlier is limited to 31
<style> elements.[4][5] - ^ Trident doesn't hide CSS backgrounds and borders on a
<noscript> element when scripting is enabled[citation needed]. - ^ While alphabetic and alphanumeric words are affected, numeric (numbers only) words are not.[citation needed]
References
External links
