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WAI-ARIA An introduction to Accessible Rich Internet Applications / CSS Minsk JS / 22 September 2018

357f279672db832fc41a5a2f36559fcb?s=47 Patrick H. Lauke
September 22, 2018
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WAI-ARIA An introduction to Accessible Rich Internet Applications / CSS Minsk JS / 22 September 2018

Vanilla HTML is limiting and boring. Our clients demand highly engaging and interactive web experiences. And wouldn’t you know, with just a bit of HTML and JavaScript we can craft amazing custom controls, widgets and effects that go far beyond the confines of traditional static markup. But how can we ensure that these custom experiences are both understandable and usable for people with disabilities, and in particular those using assistive technologies such as screen readers?

In this talk, we will look at the basics of making some common custom-built components accessible - covering how browsers and assistive technologies interact, the limitations of HTML, and how ARIA can help make interactive experiences more accessible. In addition, we will explore some of the recent additions in ARIA 1.1, as well as some particular challenges when it comes to traditional ARIA patterns and assistive technologies on mobile/tablet/touch devices.

Evergreen slidedeck at https://patrickhlauke.github.io/aria/presentation/ / https://github.com/patrickhlauke/aria/

357f279672db832fc41a5a2f36559fcb?s=128

Patrick H. Lauke

September 22, 2018
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Transcript

  1. wai-aria AN INTRODUCTION TO ACCESSIBLE RICH INTERNET APPLICATIONS Patrick H.

    Lauke / The Paciello Group
  2. what is ARIA and why do we need it ?

  3. the problem it's "easy" (in most cases) to make static

    web content accessible, but nowadays the web strives to be an application platform complex web applications require structures (e.g. interactive controls) that go beyond what regular HTML offers (though some of this introduced with HTML5 ... more on that later)
  4. jQuery UI

  5. webcomponents.org

  6. the problem when building interactive controls, some (too many) web

    developers go "all out" on the JavaScript/CSS, but ignore/sidestep regular HTML controls completely (where native HTML equivalents are available) and ignore how these controls are exposed to assistive technologies
  7. accessibility is a broad subject •  the general concept of

    accessibility covers a large spectrum of disabilities / user needs •  accessibility does not just mean "blind users with screen readers" •  sighted keyboard users, users with colour blindness / deficiencies, deaf / hard of hearing users, users with cognitive disabilities... •  however, ARIA is (almost) exclusively about how to ensure that web content is correctly conveyed to assistive technologies (screen readers, screen magnifiers with screen reading capability, etc)
  8. github.com/patrickhlauke/aria

  9. code examples here are simplified (but will hopefully convey the

    right concepts)
  10. <div onclick="...">Test</div> faked button for a sighted mouse / touchscreen

    user this is a button... but what about keyboard users?
  11. <div tabindex="0" onclick="...">Test</div> faked button with focus now we can

    at least focus it... but can we activate it?
  12. <div tabindex="0" onkeyup="..." onclick="...">Test</div> faked button with focus and keyboard

    handling for a sighted mouse / touchscreen / keyboard user this is a button... but what about assistive technology users?
  13. compare <div> to a real <button> faked button versus real

    <button>
  14. "test" versus "test button – to activate press SPACE bar"

  15. the problem generic/inappropriate HTML elements, with extra JavaScript/CSS on top...but

    they're still recognised and exposed as <span> , <div> , etc
  16. the interplay of browser and assistive technology

  17. Operating systems provide interfaces that expose information about objects and

    events to assistive technologies (e.g. Microsoft Active Accessibility [MSAA], the Mac OS X Accessibility Protocol [AXAPI], IAccessible2 [IA2])
  18. separate from the DOM, browsers have an "accessibility tree" (see

    chrome://accessibility for an example)
  19. Marco Zehe: Why accessibility APIs matter

  20. assistive technologies

  21. assistive technologies •  NVDA (free) •  Narrator (free) •  JAWS

    •  ZoomText •  Dragon NaturallySpeaking •  VoiceOver (free) •  TalkBack (free) •  ...
  22. inspection tools

  23. inspection tools test using assistive technologies (e.g. screenreaders), however... assistive

    technologies often use heuristics to repair incomplete/broken accessibility API information - so we want to check what's actually exposed to the OS/platform. of course, browsers also have bugs/incomplete support...
  24. Firefox Accessibility Inspector (version 61+) (enable devtools.accessibility.enabled in about:config )

  25. Chrome DevTools Accessibility panel

  26. Edge DevTools accessible properties

  27. Accessibility Viewer (aViewer)

  28. James Craig - Using ARIA 1.0 and the WebKit Accessibility

    Node Inspector
  29. Xcode Accessibility Inspector (but for Chrome, remember to turn on

    accessibility mode in chrome://accessibility)
  30. compare <div> to a real <button> faked button versus real

    <button>
  31. None
  32. None
  33. if you use custom (not standard HTML) widgets, use ARIA

    to ensure correct info is exposed
  34. what is ARIA?

  35. W3C - Accessible Rich Internet Applications (WAI-ARIA) 1.1

  36. ARIA defines HTML attributes to convey correct role, state, properties

    and value
  37. at a high level, ARIA defines various role and aria-*

    attributes that can be added to your markup
  38. W3C - WAI-ARIA 1.1 - 5.3 Categorization of Roles the

    whole model is vast and complex...and thankfully you don't need to remember this
  39. Roles are categorized as follows: •   Abstract Roles: never

    used in markup directly - they serve only for the categorization/definitions •   Widget Roles: interactive controls - simple or composite (made up of various components) •   Document Structure Roles: define what content/structures represent (e.g. headings, lists, groups) •   Landmark Roles: identify key parts of a document/page •   Live Region Roles: special areas of the page whose content is dynamically updated and should be announced by AT •   Window Roles: content that acts as a separate window (dialogs)
  40. each role has "states and properties" (e.g. ARIA 1.1 definition

    for button ) implicit/inherited or defined via aria-* attributes
  41. this is all complex and confusing...

  42. as my former colleague Karl Groves succinctly put it, ARIA

    helps answer the questions: what is this thing and what does it do?
  43. what information does ARIA provide? •   role: what type

    of "thing" is this? (e.g. 'button', 'main content') •   state: what is its situation? (e.g. 'disabled', 'checked', 'expanded') •   name: what is its name/label? •   relationship: is it tied to any other elements in the page somehow? this information is mapped by the browser to the operating system's accessibility API and exposed to assistive technologies. extra benefit: once AT understands meaning/purpose, it can automatically announce specific hints and prompts (e.g. JAWS "... button - to activate, press SPACE bar")
  44. <div tabindex="0" role="button" onkeyup="..." onclick="...">Test</div> faked button with appropriate role

  45. None
  46. use ARIA to: •  make custom widgets understandable to assistive

    technology users •  programmatically indicate relationships between elements •  notify users of dynamic updates •  hide irrelevant visible content from assistive technology •  remediation of inaccessible content without completely recoding
  47. ARIA roles and attributes: restrictions •  certain role s only

    make sense as part of a specific complex widget •  some aria-* attributes are global •  other aria-* attributes only make sense for particular role •  not all roles/attributes are supported/implemented consistently everywhere
  48. what ARIA doesn't do... ARIA is not magic : it

    only changes how assistive technology interprets content. specifically, ARIA does not : •  make an element focusable •  provide appropriate keyboard bindings •  change browser behavior •  automatically maintain/update properties •  change visible appearance all of this is still your responsibility...
  49. no ARIA is better than bad ARIA •  ARIA roles/attributes

    are a "promise" to users / assistive technologies (e.g. "this component is actually a button...") – you must ensure that it then behaves correctly •  if you're not sure how to represent a particular complex widget or control, don't just throw ARIA roles and attributes at your markup – you're more likely to make things worse / more confusing / non- functional for assistive technology users W3C - WAI-ARIA 1.1 Authoring Practices
  50. WAI-ARIA spec can be dry/technical - use for reference W3C

    - WAI-ARIA 1.1 Authoring Practices more digestible.
  51. in principle ARIA can be used in all markup languages

    (depending on browser support )
  52. Using ARIA to enhance SVG accessibility

  53. ...but we'll just focus on ARIA in HTML

  54. W3C - ARIA in HTML

  55. W3C - Using ARIA

  56. the 5 rules of ARIA use

  57. 1. don't use ARIA

  58. None
  59. If you can use a native HTML element [HTML5] or

    attribute with the semantics and behaviour you require already built in, instead of re- purposing an element and adding an ARIA role, state or property to make it accessible, then do so. “
  60. you can use a <span> to behave as, and be

    exposed just like, a link... <span tabindex="0" role="link" onclick="document.location='...'" onkeyup="..." >link</span> example: link ...but why would you? unless there's a very good reason, just use <a href="...">...</a>
  61. 2. don't change native semantics unless you really have to

    / know what you're doing
  62. don't do this: <h1 role="button">heading button</h1> otherwise the heading is

    no longer a heading (e.g. AT users can't navigate to it quickly) you can do this instead: <h1><span role="button">heading button</span></h1> or, in accordance with the first rule or ARIA: <h1><button>heading button</button></h1> example: heading button
  63. don't do this: <ul role="navigation"> <li><a href="...">...</a></li> ... </ul> do

    this instead: <div role="navigation"> <ul> <li><a href="...">...</a></li> ... </ul> </div> or list is no longer a list (e.g. AT won't say "list with X items...") example: list navigation
  64. 3. make interactive ARIA controls keyboard accessible

  65. All interactive widgets must be focusable and scripted to respond

    to standard key strokes or key stroke combinations where applicable. [...] Refer to the keyboard and structural navigation and design patterns and widgets sections of the WAI-ARIA 1.1 Authoring Practices
  66. 4. don't "neutralise" focusable elements

  67. don't use role="presentation" or aria-hidden="true" on a visible focusable element.

    Otherwise, users will navigate/focus onto "nothing". <!-- don't do this... --> <button role="presentation">press me</button> <button aria-hidden="true">press me</button> <span tabindex="0" aria-hidden="true">...</span> example: neutralised elements
  68. Chrome DevTools indicates when a node is hidden (directly, or

    due to an ancestor being hidden)
  69. aria-hidden removes nodes from the accessibility tree (as seen here

    in Firefox's accessibility inspector)
  70. 5. interactive elements must have an accessible name

  71. <!-- don't do this... --> <span tabindex="0" role="button"> <span class="glyphicon

    glyphicon-remove"></span> </span>
  72. <span tabindex="0" role="button"> <span class="glyphicon glyphicon-remove"> <span class="...">Delete</span> </span> </span>

    <span tabindex="0" role="button" title="Delete" > <span class="glyphicon glyphicon-remove"></span> </span> refer to WAI-ARIA 1.1 - 5.2.7. Accessible Name Calculation
  73. <span tabindex="0" role="button" aria-label="Delete" > <span class="glyphicon glyphicon-remove"></span> </span> <span

    tabindex="0" role="button" aria-labelledby="..." > <span class="glyphicon glyphicon-remove"></span> </span> ... <span id=" ... " class="...">Delete</span> refer to WAI-ARIA 1.1 - 5.2.7. Accessible Name Calculation
  74. Chrome DevTools' accessibility panel can help understand which attributes contribute

    to an element's name example: accessible name calculation
  75. side note: aria-label / aria-labelledby / aria-describedby and arbitrary elements

    (see developer.paciellogroup.com)
  76. ARIA and HTML5

  77. ARIA and HTML5 •  ARIA is used when building things

    that native HTML can't do •  for many years, ARIA was a "bridging technology" to overcome HTML semantic limitations •  HTML5 introduced new elements, element types, attributes that solve some of these situations •  there are still things that HTML can't express, so ARIA is here to stay...
  78. example: HTML5 range input

  79. W3C HTML Accessibility API Mappings 1.0

  80. HTML5 accessibility

  81. of course you can (and for many complex widgets, must)

    still use WAI-ARIA in HTML5
  82. side note: you can validate pages with (static) ARIA validator.w3.org

  83. common structures and widgets (not an exhaustive list - enough

    to understand concepts)
  84. using ARIA to provide structure

  85. <p class="1" role="heading" aria-level="1" >Heading 1</p> ... <p class="h2" role="heading"

    aria-level="2" >Heading 2</p> ... <p class="h3" role="heading" aria-level="3" >Heading 3</p> ... example: headings •  add role="heading" •  if more than one hierarchical level, and can't be inferred from structure, add explicit aria-level
  86. <div role="list" > <div role="listitem" >...</div> <div role="listitem" >...</div> <div

    role="listitem" >...</div> ... </div> example: list/listitem •  add role="list" and role="listitem" •  generally more complex (big markup structures that boil down to essentially "a list of things...")
  87. <img> is identified as an image by assistive technologies, and

    you can provide> alternative text. <img src="..." alt="alternative text"> if you're using embedded <svg> , use ARIA to achieve the same: <svg role="img" aria-label="alternative text" > ... </svg> example: embedded SVG image
  88. removing semantics

  89. if your page/app uses inappropriate markup, ARIA can be used

    to remove semantic meaning. useful for remediation if markup cannot be changed. <table role="presentation" > <tr> <td>Layout column 1</td> <td>Layout column 2</td> </tr> </table> example: layout table remediation ARIA 1.1 introduced role="none" as an alias for role="presentation" – they are equivalent (and older browsers/AT likely better off still using role="presentation" )
  90. landmarks

  91. adapted from HTML5 Doctor - Designing a blog with html5

    example: blog structure
  92. None
  93. why define landmarks? •  users of assistive technologies can more

    easily find areas of your page/app •  AT keyboard controls to navigate to/between landmarks •  overview dialogs listing all landmarks (e.g. NVDA)
  94. example: blog structure with ARIA

  95. doesn't HTML5 solve this?

  96. adapted from HTML5 Doctor - Designing a blog with html5

    example: blog structure with HTML5
  97. None
  98. using ARIA for simple/standalone widgets

  99. my JavaScript sucks... (but will hopefully convey the right concepts)

  100. button

  101. <span class="...">Button?</span> <div class="...">Button?</div> <a href="#" class="...">Button?</a> example: button while

    using a link is slightly less evil, as at least it receives keyboard focus by default, it's still not correct: links are meant for navigation , not in-page actions or form submissions
  102. <span tabindex="0" class="..." role="button" >Button!</span> <div tabindex="0" class="..." role="button" >Button!</div>

    <a href="#" class="..." role="button" >Button!</a> •  add role="button" •  make sure it's focusable •  add handling of SPACE (and in some cases ENTER )
  103. assuming there's a click handler: foo.addEventListener('keyup', function(e) { // Space

    key if (e.keyCode === 32) { // stop default behavior (usually, scrolling) e.preventDefault(); // trigger the existing click behavior this.click(); } });
  104. you could even do it "in one go" for all

    your faked buttons, assuming they have the correct role="button" , with querySelectorAll and attribute selectors: var buttons = document.querySelectorAll("[role='button']"); for (var i=0; i<buttons.length; i++) { buttons[i].addEventListener('keyup', function(e) { if (e.keyCode === 32) { e.preventDefault(); this.click(); } }); }
  105. toggle button

  106. •  default HTML does not offer a simple on/off toggle

    •  "CSS only" <input type="checkbox"> hacks – but these may be confusing to AT users/not always appropriate •  ARIA can be used to enhance native elements – start off with closest match, like an actual <button> , and extend from there
  107. let's assume we implement this with JavaScript to purely add

    a CSS classname: <button class="...">Toggle</button> <button class="... toggled ">Toggle</button> example: toggle in real applications, you'll likely keep track of the state in some additional way – this is only for illustrative purposes
  108. <button class="..." aria-pressed="false" >Toggle</button> <button class="... toggled " aria-pressed="true" >Toggle</button>

    foo.getAttribute("aria-pressed"); foo.setAttribute("aria-pressed", "true"); foo.setAttribute("aria-pressed", "false"); add aria-pressed and dynamically change its value example: toggle with aria-pressed •  these are HTML attributes and must be read/written using getAttribute() / setAttribute() •  and even boolean attributes take string values
  109. <button class="... " aria-pressed="true" >Toggle</button> button[aria-pressed="true"] { ... } •

     bonus: use CSS attribute selectors – no need for extra CSS class (this also helps debugging – easier to spot visually when ARIA roles/properties aren't correctly set) example: toggle with aria-pressed and simplified CSS toggled button.toggled { ... }
  110. if your actual label text changes when toggling, aria-pressed is

    likely not necessary (could actually be more confusing for user) <button ...>Mute</button> if (...) { this.innerHTML = "Mute"; ... } else { this.innerHTML = "Unmute"; ... } example: toggle with a changing name/label and ARIA versus toggle with a changing name/label only
  111. checkbox

  112. <span tabindex="0" class="...">Option</span> <span tabindex="0" class="... checked">Option</span> example: checkbox

  113. <span tabindex="0" role="checkbox" aria-checked="false" class="...">Option</span> <span tabindex="0" role="checkbox" aria-checked="true" class="...

    checked">Option</span> •  add role="checkbox" •  make sure it's focusable •  add handling of SPACE •  add aria-checked and dynamically change its value example: checkbox with aria-checked
  114. radio button

  115. <span tabindex="0" class="...">Yes</span> <span tabindex="0" class="... selected">No</span> <span tabindex="0" class="...">Maybe</span>

    example: radio button
  116. <span tabindex="0" role="radio" aria-checked="false" class="...">Yes</span> <span tabindex="0" role="radio" aria-checked="true" class="...

    selected">No</span> <span tabindex="0" role="radio" aria-checked="false" class="...">Maybe</span> •  add role="radio" •  add handling of SPACE and cursor keys •  add aria-checked and dynamically change its value •  should be contained inside role="radiogroup" (cfr. <fieldset> ) example: radio button with ARIA (but note incomplete focus handling)
  117. disclosure widget

  118. <button ...>More details</button> <div class="show" ...> ... </div> example: disclosure

    widget
  119. <button ... aria-expanded="true" aria-controls="disclosure1" >More details</button> <div class="show" ... id="disclosure1">

    ... </div> example: disclosure widget with aria-expanded / aria-controls
  120. accordion

  121. •  ARIA Practices 1.0 suggested using a tab panel pattern

    (we'll briefly look at this in a moment) •  ARIA Practices 1.1 is more pragmatic: an accordion is seen simply as a series of disclosure widgets (see ARIA Practices 1.1 - 3.1 Accordion)
  122. <button ... aria-expanded="true" aria-controls="accordion1" >Item 1</button> <div class="show" ... id="accordion1">

    ... </div> <button ... aria-expanded="false" aria-controls="accordion2" >Item 2</button> <div class="show" ... id="accordion2"> ... </div> <button ... aria-expanded="false" aria-controls="accordion3" >Item 3</button> <div class="show" ... id="accordion3"> ... </div> example: accordion using disclosure widgets
  123. modal dialog

  124. <button>Launch...</button> ... <div ... > <div>My custom dialog</div> ... </div>

    example: modal dialog ...but focus handling is not really correct...
  125. •  when triggered, focus should move to the dialog •

     focus should be maintained inside the dialog example: modal dialog with focus management ...but for assistive tech users, it's still not clear what is happening...
  126. <button>Launch...</button> ... <div role="dialog" aria-labelledby="dialog-header" aria-describedby="modalDialogDescription" ... > <div id="modalDialogHeader">My

    custom dialog</div> <div id="modalDialogDescription"> ... </div> ... </div> example: modal dialog with focus management and ARIA ...almost perfect, but assistive tech users can still navigate out of the modal...
  127. <div id="wrapper"> <button>Launch...</button> </div> ... <div role="dialog" ...> ... </div>

    function openModal() { document.getElementById("wrapper") .setAttribute("aria-hidden","true"); ... } function closeModal() { document.getElementById("wrapper") .removeAttribute("aria-hidden"); ... } example: modal dialog with aria-hidden note: aria-hidden does not prevent regular keyboard focus!
  128. function openModal() { document.getElementById("wrapper").setAttribute("inert",""); ... } function closeModal() { document.getElementById("wrapper").removeAttribute("inert");

    ... } example: modal dialog with inert note: inert does hide elements from accessibility tree and remove behavior such as keyboard focusability. however, not natively supported yet – use the inert polyfill
  129. <button>Launch...</button> ... <div role="dialog" aria-modal="true" aria-labelledby="dialog-header" aria-describedby="modalDialogDescription" ... > <div

    id="modalDialogHeader">My custom dialog</div> <div id="modalDialogDescription"> ... </div> ... </div> example: modal dialog with aria-modal (new in ARIA 1.1) ...but you still need to do the focus management yourself...
  130. managing focus

  131. complex widgets and focus •  some complex widgets (group of

    radio buttons, menus, listboxes, tab lists) only have a single "tab stop" •  focus/interactions within the widget are handled programmatically •   TAB / SHIFT + TAB moves to the next widget, not to sub-components
  132. keyboard navigation within widgets •  either: "roving" tabindex (only one

    element inside widget has tabindex="0" , all others tabindex="-1" ) •  or: focus remains on widget itself, denote active child element with aria-activedescendant (and manually scroll into view, provide highlight via CSS) W3C WAI-ARIA 1.1 Authoring Practices - 5.6 Keyboard Navigation Inside Components
  133. <span tabindex="-1" role="radio" aria-checked="false" class="...">Yes</span> <span tabindex="0" role="radio" aria-checked="true" class="...

    selected">No</span> <span tabindex="-1" role="radio" aria-checked="false" class="...">Maybe</span> only one radio button inside the group has focus. changing the selection using CURSOR keys, dynamically changes tabindex , aria- checked and sets focus() on the newly selected radio button example: ARIA Practices 1.1 - Radio Group Using Roving tabindex
  134. not all complex widgets lend themselves to "roving" tabindex –

    e.g. role="combobox" needs aria-activedescendant , as actual focus must remain inside the textbox. example: ARIA Practices 1.1 Combobox with Listbox Popup this approach can be complex, and not always supported by assistive technologies (particularly on mobile).
  135. live regions

  136. making assistive technology aware of content changes

  137. <div id="output"></div> var o = document.getElementById("output"); o.innerHTML = "Surprise!"; //

    show the notification example: notification as result of button press but how can AT users be made aware of the notification / content change?
  138. one way to notify users of assistive technologies of new

    content (a new element added to the page, made visible, a change in text) is to move focus() programmatically to it <div id="output" tabindex="-1" ></div> var o = document.getElementById("output"); o.innerHTML = "Surprise!"; // show the notification o.focus(); // move focus to the notification but this is not always possible, as it would interrupt the user's current actions... example: notification via focus() and a more problematic example simulating a long-running function.
  139. ARIA live regions •  announce a change on content without

    moving focus to it •   aria-live : off (default), polite , assertive
  140. <div id="output" aria-live="polite" ></div> var o = document.getElementById("output"); o.innerHTML =

    "Surprise!"; // show the notification example: notification via aria-live bonus points: set aria-disabled="true" on the control, and optionally aria-busy="true" on the notification / section of the page that is getting updated. see notification via aria-live , with aria- busy and aria-disabled
  141. •  some role s have implicit live region (e.g. role="status"

    and role="alert" ), as do some markup elements (e.g. <output> )
  142. <span role="status" > some form of status bar message... </span>

    example: status bar <span role="alert" > an alert message (no user interaction) </span> example: alert
  143. ARIA live regions need to be "primed" first – the

    browser and AT need to realize there's a live region, and start watching for changes. •  sending something with role="alert" as part of your static HTML document has no effect – AT won't announce this when the page is loading •  creating a dynamic element with aria-live="..." or an implicit live region role and filling it with content right away will (depending on timing) usually not give browser/AT enough time to "see" the element and notice the change ... again resulting in no announcement Mozilla Developer Network: ARIA Live Regions
  144. // create a new div element var newDiv = document.createElement("div");

    // set aria-live property newDiv.setAttribute("aria-live", "polite"); // and give it some content var newContent = document.createTextNode("Surprise!"); // add the text node to the newly created div newDiv.appendChild(newContent); // add the new div to the page document.body.appendChild(newDiv); // ... WON'T ACTUALLY WORK
  145. by default, live regions only announce any new/changed content. however,

    this can be controlled: •   aria-atomic : true / false ("treat the live region as one atomic unit and announce everything") example: live region clock and live region clock with aria-atomic (there's also aria-relevant , but it is badly supported/pointless - see Aaron Leventhal and Rob Dodson: Why authors should avoid aria-relevant).
  146. ARIA has many more complex/composite widgets and structures

  147. example: tab panels

  148. <div role="tablist" ...> <div role="tab" aria-controls="panel1" aria-selected="true" ...>Tab 1</div> <div

    role="tab" aria-controls="panel2" ...>Tab 2</div> <div role="tab" aria-controls="panel3" ...>Tab 2</div> </div> <div role="tabpanel" id="panel1">...</div> <div role="tabpanel" id="panel2" aria-hidden="true" >...</div> <div role="tabpanel" id="panel3" aria-hidden="true" >...</div> example: ARIA Practices 1.1 Tabs with Automatic Activation variations: Marco Zehe - Advanced ARIA tip #1: Tabs in web apps not appropriate if you're just marking up a site navigation...
  149. some shortcomings / problems with ARIA

  150. as useful as ARIA is, it is far from perfect

    ... •  some patterns rooted deeply in native (Windows95 style) application paradigms – and as a result, quite limited/restrictive •  straying from these patterns / using ARIA incorrectly can make things worse for users •  certain roles/patterns define specific keyboard interactions – but work badly or not at all in touchscreen + AT scenarios •  particularly for new roles/attributes (ARIA 1.1) and complex patterns, browser and AT support may be lacking
  151. example: menu/menubar

  152. <div role="menubar" > <div role="menuitem" ...>...</div> <div role="menu" > <div

    role="menuitem" ...>...</div> <div role="menuitem" ...>...</div> <div role="menuitem" ...>...</div> ... </div> ... </div> example: ARIA Practices 1.1 Navigation Menubar most suitable for real "application-like" web-apps - arguably not appropriate for general "website navigation"
  153. ARIA 1.1 menu (role) specific child elements only ( menuitem

    , menuitemcheckbox , menuitemradio )
  154. menu with a form control - not a valid ARIA

    menu...
  155. example: touchscreen + assistive technology

  156. Using ARIA - 2.15 ARIA Design Patterns and Touch Device

    Support
  157. ARIA Practices 1.1 - Horizontal Slider on Android / Chrome

    / TalkBack (use volume keys...)
  158. ARIA Practices 1.1 - Horizontal Slider on iOS / Safari

    / VoiceOver (swipe up or down...)
  159. ARIA Practices 1.1 - Combobox with Listbox Popup on Android

    / Chrome / TalkBack
  160. ARIA Practices 1.1 - Combobox with Listbox Popup on iOS

    / Safari / VoiceOver
  161. frameworks, web components, angular, react, etc?

  162. •  not everybody codes their complex applications from scratch using

    hand-made HTML/JavaScript/CSS •  many ready-made libraries, scripts and frameworks offer at least basic ARIA support (by default, or as an "optional" setting or module) •  particularly open source projects offer good opportunities to get involved – file issues, submit pull requests, improve documentation •  lack of accessibility/ARIA support likely not down to malice, but a lack of knowledge or even understanding of the problem...
  163. Bootstrap - Accessibility

  164. AngularJS Developer Guide - Accessibility with ngAria

  165. React - Accessibility

  166. recap...

  167. ARIA is not a magic bullet

  168. what ARIA is/isn't ... •  ARIA conveys "what is this

    thing and what does it do?" to assistive technologies •  ARIA does not influence browser behavior itself – you need to manage keyboard handling, state, etc. yourself •  ARIA is vast and complex, depends on browser/AT support, has shortcomings
  169. pragmatic approach to using ARIA •  understand/break-up complex app into

    simple component elements •  you don't always need ARIA – appropriate HTML usually best •  No ARIA is better than Bad ARIA •  consult ARIA Practices to see if they match an existing pattern •  follow the rules of ARIA •  check main ARIA specification for correct syntax, expected attributes, valid values •  test in actual browser/AT
  170. get in touch @patrick_h_lauke github.com/patrickhlauke/aria paciellogroup.com splintered.co.uk