I'm often scrapping together a quick test to see how a particular web feature behaves in various browsers or with assistive technologies. This page is my semi-organized, not-quite-annotated list of many of these tests. Unfortunately with little or no annotation it's up to you to decipher my intent for many of these tests, and unfortunately my findings with these tests are sporadically reported if at all. The date associated with each test is the date of the most recent update. For tests dated September 2008 or later, you may find relevant discussion in blog posts on or about that date.

HTML5/Flash Audio

• HTML5 Audio test of browser dependence on media filename - June 2011
• HTML5 Audio filename dependence Part 2 - November 2011
• HTML5 Audio with default browser controls - August 2010
• HTML5 Audio with custom controls - August 2010
• Flash MP3 Player: niftyPlayer - September 2010
• Yahoo! Media Player Test #1 - September 2010
• Yahoo! Media Player Test #2 - September 2010
• Yahoo! Media Player Test #3 - September 2010

HTML5/Flash Video

• Test of output from universalsubtitles.org - July 2011
• YouTube Player Tests - June 2011
• HTML Video Tests - February 2011
• JW Player Tests - Several tests related to captions, audio description, etc. - January 2011

HTML5/ARIA (Not Audio or Forms Related)

• HTML5 Semantic Markup - page designed for testing screen reader support for HTML5 semantic markup (including the JAWS 11 header bug)
• ARIA Landmarks - Apr 2010
• ARIA Live Regions Test - Dec 2009
• Table Summary Test - page designed to test the "obsolete" table summary attribute against providing a summary via aria-describedby - Apr 2013

Language/Internationalization

• Lang Attributes Test - July 2010
• The Accessible Twitter Translation & Lang Experiment (TATTLE) - July 2010
• Portuguese Language Text - Demonstration of a bug in Google AJAX Language API - July 2010

Alternate Text

• Alt vs. Title - March 2010
• Alt Text Length - Mar 2004
• Alt Appropriateness - Jan 2007
• Long Description Test Page - Sep 2009
• NULL Alt and Long Alt - Dec 2005

Form Controls

• Buttons - Test of various methods for displaying buttons in HTML - December 2011
• Forms and ARIA - August 2011
• Form with Title Attributes on Input Fields - July 2011
• Forms with Disabled Input Fields
• Pre-populated Input Fields - Jan 2011
• Fieldset - May 2011
• Shared Label Accessibility Dilemma (SLAD) - Apr 2005
• Nested Fieldsets - Jan 2007

CSS

• Positioning Expandable Captions with CSS - Feb 2011
• CSS Focus - Sep 2008
• Floats in Lists - May 2010

Javascript/JQuery

• JQuery - getting the updated value of a textarea field - May 2011

Other Tests, Listed Alphabetically

• Abbreviations and Acronyms - Test to see whether and how browsers and assistive technologies support the <abbr> and <acronym> elements
• AccessKey Test - Test to see which browsers support dynamically-created accesskeys - Aug 2010
• AccessKey (Hidden) - Test to see whether browsers support accesskeys on hidden elements - Aug 2010
• Definition List - Jul 2003
• Event Handlers - Test of various methods of handling events - Aug 2010
• Frames: Title vs. Name - Apr 21, 2010
• Hidden Content Test - Mar 2008
• HTML Special Characters and Forms - Jul 2005
• Label Character Limit Test - Jun 2009
• Link Test - Tests which content user agents use to generate lists of links - Jul 2009
• Mixed Link Text Test - Oct 2009
• Lists within Tables - Dec 2009
• NOSCRIPT Test - Sep 2008
• OPTGROUP Test - Mar 2010
• Rich Text Editors - a (slow) work in progress
• Tables - simple and complex tables, with and without accessible markup - Jan 2006
• TABINDEX Test - Nov 2009
• Upper Case Character Test