When can I use...

# PNG alpha transparency

- Candidate Recommendation

Semi-transparent areas in PNG files

Resources:: W3 Test files; Workaround for IE6

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 6.0 to expire

# CSS 2.1 selectors

- Candidate Recommendation

Allows more accurate element selecting, using >, +, [attr], :first-child, etc.

Resources:: Detailed support information; Examples of advanced selectors

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 6.0 to expire

# WYSIWYG editable elements (contenteditable attribute)

- Working Draft

Method of making any HTML element editable

Resources:: Demo page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Firefox 2.0 to expire

# CSS table display

- Candidate Recommendation

Method of displaying elements an tables, rows, and cells

Resources:: Detailed article on usage

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 7.0 to expire

# CSS generated content

- Candidate Recommendation

Method of displaying text or images before or after elements

Resources:: Examples of different types of generated content

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 7.0 to expire

# Data URIs

- IETF standard

Method of embed images and other files in webpages as text.

Resources:: Example image; Inline Images with Data URLs; Wikipedia

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 7.0 to expire

Note: Support in Internet Explorer 8b2 is limited to images and linked resources like CSS files, not HTML files. Max URI length is 32KB.

# CSS3 Box-sizing

- Candidate Recommendation

Method of specifying whether or not an element's borders, padding and margin should be including in size units

Resources:: CSS3 box-sizing attribute

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 7.0 to expire

# Canvas (basic support)

- Working Draft

Method of generating dynamic graphics using JavaScript

Resources:: Wikipedia; Tutorial by Mozilla; Animation kit experiment

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

# XHTML served as application/xhtml+xml

- Recommendation

A strict form of HTML, and allows embedding of other XML languages

Resources:: Wikipedia; Examples compared to text/html pages

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

Note: The XHTML syntax is very close to HTML, and thus is almost always served as text/html on the web.

# SVG (basic support)

- Recommendation

Method of displaying basic Vector Graphics features using the embed or object elements

Resources:: Wikipedia; Sample files

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

# New, stylable HTML5 elements

- Working Draft

HTML5 offers some new elements, primarily for semantic purposes. The "stylable" part refers to the ability to use CSS on these elements

Resources:: Workaround for IE; Alternate workaround

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

Note: In Firefox 2 and older, the elements are self-closing.

# CSS3 Colors

- Candidate Recommendation

Method of describing colors using HSL, as well as allowing alpha-transparency

Resources:: HSL demo; RGBA demo; HSLA demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

Note: Incomplete support by Presto (Opera) refers to the lack of support for RGBA/HSLA. Incomplete support by Firefox 2 refers to support for HSL, not HSLA or RGBA

# querySelector

- Working Draft

Method of accessing DOM elements using CSS selectors

Resources:: Selectors test including querySelectorAll

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 7.0, Firefox 3.0, Opera 9.6 to expire

Note: Only works for the CSS selectors available. Thus the IE8 implementation is limited to the CSS 2.1 selectors

# getElementsByClassName

- Working Draft

Method of accessing DOM elements by class name

Resources:: Test page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

# CSS 3 selectors

- Candidate Recommendation

Advanced element selection

Resources:: Detailed support information; W3 Test suite; Automated CSS3 selector test

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

# CSS3 Multiple column layout

- Working Draft

Method of flowing information in multiple columns

Resources:: Demo page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Opera 10.0 to expire

# SVG fonts

- Recommendation

Method of using fonts defined as SVG shapes

Resources:: Font example

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5 to expire

Note: Gecko support "high on the list" for Firefox 3.2, but not guaranteed

# CSS3 Media Queries

- Candidate Recommendation

Method of applying styles based on media information. Includes things like page and device dimensions

Resources:: Demo page for page width

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0 to expire

Note: Incomplete support by webkit refers to only acknowledging different media rules on page reload

# CSS3 Rounded corners (border radius)

- Working Draft

Method of making the border corners round

Resources:: Demo page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Opera 10.0 to expire

Note: Incomplete support refers to non-antialiased corners

# Accessibility for AJAX and other web features (WAI-ARIA)

- Working Draft

Method of providing ways for people with disabilities to use dynamic web content and web applications

Resources:: Wikipedia; Information page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 1.* to expire

# Font linking (@font-face)

- Working Draft

Method of displaying fonts downloaded from websites

Resources:: Article with several test pages

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 1.* to expire

Note: Trident (Internet Explorer) only supports EOT fonts

# CSS3 Border images

- Working Draft

Method of using images for borders

Resources:: Example page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Opera 10.0 to expire

# CSS3 Box-shadow

- Working Draft

Method of displaying shadow or blur effect to elements

Resources:: Webkit demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Opera 10.0 to expire

# Cross-document messaging

- Working Draft

Method of sending information from pages on different domains to each other (using postMessage)

Resources:: Demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 1.* to expire

# CSS 3 Text-shadow

- Candidate Recommendation

Method of displaying shadow or blur effect to text

Resources:: Information page with examples

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Chrome 1.* to expire

Note: Incomplete support by webkit refers to the lack of support for multiple shadows

# CSS3 Multiple backgrounds

- Working Draft

Method of using multiple images as a background

Resources:: Example page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5 to expire

# Client-side storing of name/value pairs

- Working Draft

Method of storing data locally like cookies, but for larger amounts of data (sessionStorage and localStorage).

Resources:: Gecko reference

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 1.* to expire

# Audio element

- Working Draft

Method of playing sound on webpages (without requiring a plug-in)

Resources:: Podcast site that uses <audio>

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 2.0 to expire

Note: Opera 9.5+ supports the HTML5 audio object, though not the element. While the Opera "Video" build only supports Ogg Vorbis audio files using the video element, Opera 10 is expected to support the audio element as well.

# SVG in CSS backgrounds

- Working Draft

Method of using SVG images as CSS backgrounds

Resources:: Test page

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5, Chrome 1.* to expire

Note: Incomplete support by webkit refers to limitations on the conditions (see test page for examples). Gecko support "high on the list" for Firefox 3.2, but not guaranteed

# SVG SMIL animation

- Recommendation

Method of using animation elements to animate SVG images

Resources:: Example files

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5, Chrome 1.* to expire

Note: Gecko support "high on the list" for Firefox 3.2, but not guaranteed

# SVG filters

- Recommendation

Method of using photoshop-like effects on SVG shapes

Resources:: Advanced filter effects; W3C example

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 2.0 to expire

# Drag and Drop

- Working Draft

Method of easily dragging and drop elements on a page

Resources:: WhatWG demo; Another demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Chrome 1.*, Opera 10.0 to expire

# MathML

- Recommendation

An XML language that allows mathematical formulas and notations to be written on web pages.

Resources:: Wikipedia; MathML Opera Stress Tests; MathML Opera Torture Tests; Info on Opera's MathML support

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Safari 4.0, Chrome 1.* to expire

Note: Opera's support is limited to a CSS profile of MathML

# Offline web applications

- Working Draft

Method of selecting web page files to be cached, thus allowing them to work offline on subsequent visits to the page

Resources:: Offline app demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Chrome 1.*, Opera 10.0 to expire

Note: Also supported in Mobile Safari 3.1 Google Chrome includes the Google Gears plug-in by default, which can be used as alternative

# Video element

- Working Draft

Method of playing videos on webpages (without requiring a plug-in)

Resources:: Several tests

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Chrome 1.*, Opera 10.0 to expire

Note: Webkit only supports QuickTime videos by default, Presto and Firefox only support Ogg Theora files

# Independent JavaScript threading (Web Workers)

- Working Draft

Method of running scripts in the background, isolated from the web page

Resources:: Web Worker demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Chrome 1.*, Opera 10.0 to expire

Note: Google Chrome includes the Google Gears plug-in by default, which can be used as alternative

# Text API for Canvas

- Working Draft

Method of displaying text on Canvas elements

Resources:: Examples by Mozilla; Example chart

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Chrome 1.*, Opera 10.0 to expire

# HTML5 form features (Web Forms 2.0)

- Working Draft

Expanded form options, including things like date pickers, sliders and validation

Resources:: W3 Test page (based on original spec)

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Firefox 4.0, Safari 4.*, Chrome 2.0 to expire

Note: Opera implementation is based on the original WHATWG specification. Some changes have been made in HTML5

# Client-side Database Storage

- Working Draft

Method of storing data locally, allows database queries for access and manipulation

Resources:: Webkit example

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5, Chrome 1.* to expire

# Server-sent DOM events

- Working Draft

Method of continuously sending data from a server to the browser, rather than repeatedly requesting it (EventSource interface)

Resources:: Opera blog post w/info; Opera web chat demo

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0	2.0	3.1	0.2	9.0
Present	7.0	3.0	3.2	1.0	9.6
Near Future (2009)	8.0	3.5	4.0	1.*	10.0
Future (2010 or later)	9.0	4.0	4.*	2.0	10.*
Conclusion: Not ready. Waiting for Internet Explorer 8.0, Firefox 3.5, Safari 4.0, Chrome 1.* to expire

Note: Opera implementation is based on the original WHATWG specification, using the <event-source> HTML element. Much has changed in the specification since then, and no element is actually used.

# Summary

Calculation of support of currently displayed feature lists

	Internet Explorer	Firefox	Safari	Chrome	Opera
Past	6.0: 4%	2.0: 34%	3.1: 46%	0.2: 54%	9.0: 37%
Present	7.0: 11%	3.0: 51%	3.2: 68%	1.0: 54%	9.6: 63%
Near Future (2009)	8.0: 31%	3.5: 83%	4.0: 88%	1.*: 54%	10.0: 69%
Future (2010 or later)	9.0: 31%	4.0: 92%	4.*: 88%	2.0: 83%	10.*: 79%

When can I use...

Compatibility tables for features in HTML5, CSS3, SVG and other upcoming web technologies

FAQ

Which features do you choose to add to this list?

Why include Chrome and Safari separately, since they both use Webkit?

What's the point in having the conclusion if it will always be "not ready" with an implementation missing?

How do you decide on the eras? Chrome 0.2 in the same "era" as Internet Explorer 6? What?

When does is a feature considered "supported"?

Is there an intentional bias against Internet Explorer?

Then why are there more unofficial features by other browsers? Where's IE's filter, CSS behaviors, etc?

How often is this page updated?

Legend

Notes

Then why are there more unofficial features by other browsers? Where's IE's `filter`, CSS behaviors, etc?