Selfish Accessibility: HTML5 Developer Conference 2014

Selfish AccessibilityPresented by Adrian Roselli for HTML5 Developer Conference 2014

I suspect there’s a hashtag.

About Adrian Roselli

• Co-written four books.• Technical editor

for two books.• Written over fifty

articles, most recentlyfor .net Magazine andWeb Standards Sherpa.

Great bedtime reading!

About Adrian Roselli

• Member of W3C HTML Working Group, W3C Accessibility Task Force, five W3C Community Groups.

• Building for the web since 1994.• Founder, owner at Algonquin Studios (

AlgonquinStudios.com).• Learn more at AdrianRoselli.com.• Avoid on Twitter @aardrian.

I warned you.

What We’ll Cover

• Boring Statistics• How to Be Selfish• Basic Tests• Some Techniques• Questions (ongoing!)

Work with me, people.

Boring Statistics

1 of 4 sections.

Any Disability

• In the United States:• 10.4% aged 21-64 years old,• 25% aged 65-74 years old,• 50% aged 75+.

• Includes:• Visual• Hearing• Mobility• Cognitive

http://www.who.int/mediacentre/factsheets/fs282/en/http://www.disabilitystatistics.org/reports/2012/English/HTML/report2012.cfm?fips=2000000&html_year=2012&subButton=Get+HTML

Vision Impairments

• 285 million worldwide:• 39 million are blind,• 246 million have low vision.• 82% of people living with blindness are aged 50

and above.• 1.8% of Americans aged 21-64.• 4.0% of Americans aged 65-74.• 9.8% of Americans aged 75+.

http://www.who.int/mediacentre/factsheets/fs282/en/http://www.disabilitystatistics.org/reports/2012/English/HTML/report2012.cfm?fips=2000000&html_year=2012&subButton=Get+HTML

Hearing Impairments

• 360 million people worldwide have disabling hearing loss.

• 17% (36 million) of American adults report some degree of hearing loss:• 18% aged 45-64 years old,• 30% aged 65-74 years old,• 47% aged 75+ years old.

http://www.who.int/mediacentre/factsheets/fs300/en/https://www.nidcd.nih.gov/health/statistics/Pages/quick.aspx

Mobility Impairments

• In the United States:• 5.5% aged 21-64 years old.• 15.6% aged 65-74 years old.• 32.9% aged 75+.

http://www.disabilitystatistics.org/reports/2012/English/HTML/report2012.cfm?fips=2000000&html_year=2012&subButton=Get+HTML

Cognitive Impairments

• Dyslexia• Dyscalculia• Memory issues• Distractions• In the United States:• 4.3% aged 21-64 years old.• 5.4% aged 65-74 years old.• 14.4% aged 75+.

http://www.disabilitystatistics.org/reports/2012/English/HTML/report2012.cfm?fips=2000000&html_year=2012&subButton=Get+HTML

How to Be Selfish

2 of 4 sections.

WebAIM’s Hierarchy for Motivating Accessibility Change

http://webaim.org/blog/motivating-accessibility-change/

My Hierarchy for Motivating Accessibility Change

Is better, no?

Getting Older

• Affects (nearly) everyone,• Carries risks and side effects,• Is not for the young.

I’m still experimenting with it.

Rising Damp on Flickr.

Darren Baldwin on Flickr.

Accidents

• Broken limbs,• Eye injuries,• Hearing injuries,• Head trauma.

All of these have happened to me, multiple times.

James Lee on Flickr.

Rev Stan on Flickr.

Let Ideas Compete on Flickr.

Fluffy Steve on Flickr.

Paul Townsend on Flickr.

But I’m Invincible!

• Multi-tasking,• Sunlight,• Eating at your desk,• No headphones handy,• Content is not in your native language.

The sun is trying to kill me.

Shawn Liu on Flickr.

Bitznbitez on Flickr.

Mariëlle on Flickr.

barockschloss on Flickr.

Seb on Flickr.

A.Davy on Flickr.

Raul Lieberwirth on Flickr.

Tim Norris on Flickr.

Lars Kristian Flem on Flickr.

Steve Rhodes on Flickr.

SuperFantastic on Flickr.

Jacob Enos on Flickr.

https://twitter.com/aardrian/statuses/388733408576159744

Tech Support

• Think of your family!• Think of your time spent helping them!

This is why we hate the holidays.

Robert Simmons on Flickr.

The Message

• Supporting accessibility now helps to serve future you.

• Supporting accessibility now helps injured you, encumbered you.

• Getting younger developers to buy in helps future you – if you teach them well.

There is no try.

Basic Tests

3 of 4 sections.

Click on Field Labels

• When you click label text next to a text box, does the cursor appear in the field?

• When you click label text next to a radio / checkbox, does it get toggled?

• When you click label text next to a select menu, does it get focus?

http://www.karlgroves.com/2013/09/05/the-6-simplest-web-accessibility-tests-anyone-can-do/

Unplug Your Mouse

• Turn off your trackpad, stick, trackball, etc.• Can you interact with all controls (links,

menus, forms) with only the keyboard?• Can you tell which item has focus?• Does the tab order match your expectation?

http://www.karlgroves.com/2013/09/05/the-6-simplest-web-accessibility-tests-anyone-can-do/

Turn off Images

• Can you still make sense of the page?• Is content missing?• Can you still use the site?• Is your alt text useful?

http://www.karlgroves.com/2013/09/05/the-6-simplest-web-accessibility-tests-anyone-can-do/

Turn on High Contrast Mode

• Windows only.• Background images and colors are replaced.• Text colors are replaced.• Does this make your site unusable?

http://www.karlgroves.com/2013/09/05/the-6-simplest-web-accessibility-tests-anyone-can-do/http://blog.adrianroselli.com/2012/08/css-background-images-high-contrast-mode.html

Turn off CSS

• Does important content or functionality disappear?

• Do error messages or other items that rely on visual cues make sense?

• Is content still in a reasonable order?• Do any styles (colors, text effects, etc.)

remain?

http://www.karlgroves.com/2013/09/05/the-6-simplest-web-accessibility-tests-anyone-can-do/

Test for Colorblindness/Contrast

• Is there enough contrast?• Are hyperlinks, menus, etc. still visible?• Tools:• Chrome Color Contrast Analyzer• Lea Verou’s Contrast Ratio• WebAIM Color Contrast Checker• CheckMyColours.com

http://www.inpixelitrust.fr/blog/en/tips-create-accessible-color-palette/http://alistapart.com/blog/post/easy-color-contrast-testing

Protanopia

Deuteranopia

Tritanopia

Look for Captions & Transcripts

• Do video/audio clips have text alternatives?• Are links to closed-captions or transcripts built

into the player or separate text links?• Is there an audio description available?• Tools:• Media Access Australia YouTube captioning

tutorial, Vimeo captioning tutorial• Tiffany Brown’s WebVTT tutorial

http://webaim.org/techniques/captions/

https://www.youtube.com/watch?v=zCqN_cCLnnk

Hyperlinks!

• Is there any “click here,” “more,” “link to…”?• Are you using all-caps, URLs, emoticons?• Do you warn before opening new windows?• Do links to downloads provide helpful info?• Are you using pagination links?• Are your links underlined (or otherwise obvious)?• Is there alt text for image links?• Is the link text consistent?

http://www.sitepoint.com/15-rules-making-accessible-links/

http://blog.adrianroselli.com/2014/03/i-dont-care-what-google-did-just-keep.html

Some Techniques

4 of 4 sections.

WAI-ARIA

• Web Accessibility Initiative – Accessible Rich Internet Applications.

• Adds accessibility information to HTML elements.

• Can be used with prior versions of HTML.• WAI-ARIA 1.0 published March 20, 2014.

http://www.w3.org/TR/wai-aria/

Four Five Rules of ARIA Use

1. If you can use a native HTML5 element with semantics/behavior already built in, then do so, instead of repurposing another element.

RT this! https://twitter.com/aardrian/status/454249142387081219

Four Five Rules of ARIA Use

2. Do not change native semantics. Unless you really have to (no <h1> with a role="button", for example).

RT this! https://twitter.com/aardrian/status/454249201564532737

Four Five Rules of ARIA Use

3. All interactive ARIA controls must be usable with the keyboard — keyboard users must be able to perform equivalent actions.

RT this! https://twitter.com/aardrian/status/454249253284483072

Four Five Rules of ARIA Use

4. Do not use role="presentation" or aria-hidden="true" on a focusable element. If you do so, some users will never be able to focus.

RT this! https://twitter.com/aardrian/status/454249297408585729

Four Five Rules of ARIA Use

5. All interactive elements must have an accessible name (in progress). This may come from a visible (text on a button) or invisible (alt text on an image) property.

As of May 12: http://rawgit.com/w3c/aria-in-html/master/index.html#fifth-rule-of-aria-use Accessible name: http://www.w3.org/TR/wai-aria/terms#def_accessible_name

Role Playing

Stolen from Heydon Pickering: https://twitter.com/heydonworks/status/420196676297424898/

HTML/ARIA Don’t

• <div onclick="DoThing();">Do a thing.</div>

I see this all the time.

HTML/ARIA Don’t

• <div onclick="DoThing();" tabindex="0">Do a thing.</div>

I see this a bunch, too.

HTML/ARIA Don’t

• <div onclick="DoThing();" tabindex="0" onkeypress="DoThing();">Do a thing.</div>

Excluded bits like if(event.keyCode==32||event.keyCode==13)DoThing();

HTML/ARIA Don’t

• <div onclick="DoThing();" tabindex="0" onkeypress="DoThing();" role="button">Do a thing.</div>

ARIA roles to the rescue! Er…

HTML/ARIA Do

• <button onclick="DoThing();" onkeypress="DoThing();">Do a thing.</button>

Or just start with the right element. http://www.karlgroves.com/2013/05/14/links-are-not-buttons-neither-are-divs-and-spans/

WAI-ARIA

• Accessibility Lipstick on a Usability Pig• By Jared Smith: http

://webaim.org/blog/accessibility-lipstick-on-a-usability-pig/

• What is WAI-ARIA, what does it do for me, and what not?• By Marco Zehe: http

://www.marcozehe.de/2014/03/27/what-is-wai-aria-what-does-it-do-for-me-and-what-not/ ARIA ALL THE THINGS!

HTML5 Elements

• Sectioning elements already have accessibility built in. Use them.• <header>• <nav>• <main> (one per page)• <aside>• <footer>• <form> (a search form)

This stuff is baked in!

HTML5/ARIA Landmarks

• They don’t always have support in assistive technologies (AT), so use roles as well.• <header role="banner"> (once per page)• <nav role="navigation">• <main role="main"> (one per page)• <aside role="complementary">• <footer role="contentinfo"> (once per page)• <form role="search">

http://www.w3.org/WAI/GL/wiki/Using_ARIA_landmarks_to_identify_regions_of_a_page

Generic Desktop Layout

<header role="banner">

<nav role="navigation">

<aside role="complementary">

<form role="search">

<footer role="contentinfo">

<main role="main">

Generic “Mobile”

Layout

<header role="banner">

<nav role="navigation">

<aside role="complementary">

<form role="search">

<footer role="contentinfo">

<main role="main">

“Mobile” really means narrow screen in RWD, as well as this context.

HTML5 Headings

• Use normal heading ranks to convey document structure.

• Don’t skip; go in order.

<h1><h2>

<h3><h4>

<h5><h6>

Fun fact: NCSA Mosaic 1.0 had provisions for an <h7>: http://blog.adrianroselli.com/2013/04/ncsa-moscaic-turns-20.html

HTML5 Headings

• Document Outline Algorithm…• Is a myth,• Isn’t implemented in any browsers,• Should not be relied upon.

• Don’t be fooled by articles claiming otherwise.• Spec being updated.• No SEO benefit for one over other.

http://blog.adrianroselli.com/2013/12/the-truth-about-truth-about-multiple-h1.html

The New <div>itis

• <section>orrhea, <article> abuse.• These map to regions in page navigation order

(role="region").• Can overwhelm users of AT.• If it doesn’t get an <h#>, don’t use it.• If it shouldn’t be in the document outline,

don’t use it.

http://www.w3.org/TR/html5/sections.html#the-section-elementhttp://www.w3.org/TR/html5/sections.html#the-article-element

Alternative Text

• Which is correct?• <img src="fox.png" alt="Photo of a fox reading

aloud from a book.">• <img src="fox.png" title="Photo of a fox reading

aloud from a book.">• <img src="fox.png" aria-label="Photo of a fox

reading aloud from a book.">• <img src="fox.png" aria-labelledby="FoxPic"> <p

id="FoxPic">Photo of a fox reading aloud from a book.</p>

http://blog.adrianroselli.com/2013/11/image-alt-exception-change-re-re-re.html

Alternative Text

• Use alt.• Longdesc links to more verbose alternative.

http://www.w3.org/blog/2014/03/wcag-techniques-for-image-text-alternatives/

Alternative Text Decision Tree

http://www.4syllables.com.au/2010/12/text-alternatives-decision-tree/http://dev.w3.org/html5/alt-techniques/#tree

1. What role does image

play?

2. Does it present new

info?

3. What type of info?

Informative Yes

alt=""or

<a href="foo"><img alt="">Link</a>alt=""or

Use CSS

alt="descriptive identification"or

alt="short label" + caption

Pure

ly D

ecor

ative Se

nsor

y

No alt="label for link"

alt=“short alternative"or

alt="short label" + caption

alt="short label + location of long alternative"or

long text alternative on same or linked page

Long

/ C

ompl

ex

Shor

t / S

impl

eLink

Questions

This isn’t a section, you should have been asking all along.

Resources

• Web Accessibility and Older People:Meeting the Needs of Ageing Web Usershttp://www.w3.org/WAI/older-users/Overview.php

• Easy Checks - A First Review of Web Accessibilityhttp://www.w3.org/WAI/eval/preliminary

• How People with Disabilities Use the Web: Overviewhttp://www.w3.org/WAI/intro/people-use-web/Overview.html

In addition to the gems I’ve sprinkled throughout.

Resources

• 2.11 ARIA Role, State, and Property Quick Referencehttp://www.w3.org/TR/aria-in-html/#aria-role-state-and-property-quick-reference

• 2.12 Definitions of States and Properties (all aria-* attributes)http://www.w3.org/TR/aria-in-html/#definitions-of-states-and-properties-all-aria--attributes

In addition to the gems I’ve sprinkled throughout.

Resources

• a11yTipshttp://dboudreau.tumblr.com/

• How to Write User Stories for Web Accessibilityhttp://www.interactiveaccessibility.com/blog/how-write-user-stories-accessibility-requirements

• Book Excerpt: A Web for Everyonehttp://uxmag.com/articles/book-excerpt-a-web-for-everyone

In addition to the gems I’ve sprinkled throughout.

Selfish AccessibilityPresented by Adrian Roselli for HTML5 Developer Conference 2014

My thanks and apologies.

Slides from this talk will be available at http://rosel.li/HTML5DevConf2014