Comparison of layout engines (Non-standard HTML)
| Standard | 54.0.1 / June 29, 2017 |
|---|---|
| ESR | 52.2.1 / June 29, 2017 |
| Beta & Developer Edition | 55.0beta / June 14, 2017 semiweekly release |
|---|---|
| Nightly | 57.0a1 / August 2, 2017 daily release |
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. 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 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.
Rather than the names of web browsers and HTML to PDF converters, the names of the underlying engines are used. Some of the software and online converters that use the various engines are listed below.
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.
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