Note:

If you want to create a new page for developers, you should create it on the Moodle Developer Resource site.

Accessibility notes: Difference between revisions

From MoodleDocs
(Consolidating accessibility documentation)
 
(14 intermediate revisions by 3 users not shown)
Line 1: Line 1:
<p class="note">These are DRAFT notes on what CSS classes, PHP functions and the so on have been added to Moodle 1.6 onwards to aid accessibility. They can be seen as design patterns, techniques, guidelines, and perhaps best practice(?)
{{obsolete}}


Based on a workshop at [http://moodlemoot.ca Moodlemoot 2007, Canada]
This page has been replaced because the content was no longer applicable to the current version of Moodle.
Lots for me to add/edit! Comments welcome!
[[User:Nick Freear|Nick Freear]] 11:38, 28 August 2007 (CDT)
</p>


Current documentation can be found here:


== Guidelines ==
[https://docs.moodle.org/dev/Accessibility "Accessibility in Moodle"]
Most of the relevant guidelines and standards are published by the [http://w3.org Worldwide Web Consortium] (W3C), including the [http://w3.org/WAI Web Accessibility Initiative] (WAI).


* [http://w3.org/TR/WCAG10 Web Content Accessibility Guidelines 1.0] (WCAG10), published May 1999, there are useful documents including [http://w3.org/WAI/intro/wcag10docs.php errata, a checklist, '''techniques''', quick tips and so on].
The previous version of this document can be seen [https://docs.moodle.org/dev/index.php?title=Accessibility_notes&oldid=49247 in the history]
* WCAG 1.0 contains 14 guidelines (see below), sub-divided into 65 checkpoints numbered 1.1 to 14.3.
* The checkpoints are organised into 3 priority levels, 1 (A) ''must'', 2 (double-A) ''should'', 3 (triple-A) ''may'' - Moodle should aim for level 2 and some of level 3.
* Moodle is subject to other guidelines including the [http://w3.org/TR/ATAG10 Authoring Tool Accessibility Guidelines 1.0], see [http://w3.org/WAI/guid-tech.html this overview].
 
 
The WCAG 1.0 Guidelines:
# Provide equivalent alternatives to auditory and visual content.
# Don't rely on color alone (or bold or other styling)
# Use markup and style sheets and do so properly.
# • Clarify natural language usage
# Create tables that transform gracefully.
# • Ensure that pages featuring new technologies transform gracefully.
# • Ensure user control of time-sensitive content changes.
# Ensure direct accessibility of embedded user interfaces.
# Design for device-independence.
# • Use interim solutions.
# • Use W3C technologies and guidelines.
# Provide context and orientation information.
# Provide clear navigation mechanisms.
# • Ensure that documents are clear and simple.
 
 
== Fix and test ==
 
; Formal user testing : The most valuable and time-consuming.
; Informal user feedback : .
; Expert evaluation : .
; Developer evaluation : .
 
A desirable process:
# Test
# Identify
# Specify/ report
# Discuss/ clarify
# Implement solution
# Re-test
# '''Iterate ...'''
 
== Issues remaining ==
A todo list, for Moodle 2.0?
 
* QuickForm fixes: review, complete.
* Old forms: replace remaining with QuickForms.
* Course formats: replace layout tables, as per 'weekscss' [http://tracker.moodle.org/browse/MDL-9306 MDL-9306].
* Layout tables: remove remaining.
* Text editor: fix remaining issues/ replace.
* ...
* Language packs: fix XHTML, semantics.
* Automated testing?
* Documentation.
 
== Issues fixed ==
Note, some of the headline items here could be added to the release notes.
See also [[Release Notes]] | [[Old releases]] | [[Roadmap]].
 
 
=== Moodle 1.9 Beta 2 ===
Released: circa 22 October 2007
 
* QuickForm fixes: [http://tracker.moodle.org/browse/MDL-8627 MDL-8627], MDL-11134.
* Skip block/ skip to content bug fixes, and extended to site home page, course index, as well as course pages [http://tracker.moodle.org/browse/MDL-7878 MDL-7878], MDL-11675, MDL-11695.
* Side block lists, MDL-6548: TODO.
* English language help files: completed MDL-9890.
* (''Consolidation'')
 
=== Moodle 1.8 ===
Released: 31st March 2007
 
Following more expert evaluation, the Open University put together a comprehensive [[Moodle Accessibility Specification|Specification]] listing what needed fixing in parts of core Moodle and modules.
Moodle.com undertook what were judged to be high priority items from this list - see meta-bug [http://tracker.moodle.org/browse/MDL-7396 MDL-7396] (45 sub-tasks, 3 dependencies). Here is a summary...
 
* Forms: QuickForms adopted for many - consistent rendering: labels, fieldset/legend, tableless.
* XHTML Strict drive.
* Text editor keyboard shortcuts.
* Tabs: replaced table with list.
* ...
* Side block lists [http://tracker.moodle.org/browse/MDL-6548 MDL-6548]: blog tags (inline), messages, news items, section links (inline).
* English help files: [http://tracker.moodle.org/browse/MDL-9890 MDL-9890], Help should be well-formed...
 
 
=== Moodle 1.7 ===
Released: 7th November 2006
 
* '''Consolidation'''
* Breadcrumb and left/right-arrow icons fixed: replaced with 'silent' Unicode arrow characters.
* Side block lists, [http://tracker.moodle.org/browse/MDL-6548 MDL-6548]: admin bookmarks, (mnet hosts), rss client.
 
 
=== Moodle 1.6 ===
Released: 19th June 2006
 
Accessibility proposal from Open University identified problems and some solutions. Note, due to time constraints we did not evaluate or modify modules, the content of most side blocks and so on - most changes were to core.
 
* ALT text: fixed for side-blocks, some themes, and in core.
* Standard theme & other 14 themes: removed layout table(s), &lt;h1> used to markup headings (some to do).
* Breadcrumb trail: marked up as a list, with a heading (hidden by default for visual user), and graphic for breadcrumb separator.
* Side blocks: heading marked up as &lt;h2>, added 'skip block' links (needs review).
* Side blocks: removed nested layout tables, started using list markup (activity modules, admin, course list, participants, main menu, social activities - list render in print_side_block; online users).
* Calendar: fixed data table headers, summary, abbreviations, non-visual indication of 'today', next/previous links.
* Calendar style: improved colour contrast in standard theme for event backgrounds, links, weekend colours.
* Weekscss course format: new format plug-in that does ''not'' use layout tables, based on the 'weeks' course format.
 
 
=== Moodle 1.5 ===
Released: 5th June 2005
 
== Assistive technology ==
 
Technology to enable those with disabilities to use a computer can be categorised in terms of their ''distance'' from the user.
For example:
 
* Physical layer: specialist pointing devices, mice, joy-sticks, keyboards.
* Operating system layer: Mac Voiceover, Windows Narrator ...
* System specialisation layer: technology not part of the OS that tries to work with ''all'' software tools.
** Screen magnification.
** Screen readers: JAWS, Window-Eyes, Thunder/WebbIE (speech or braille).
** Speech recognition: Dragon Naturally Speaking ...
* Software tool layer: audio browsers, plug-ins for Web browsers, word processors.
* Application layer: technology integrated in a web site, eg. Browsealoud, style sheet switching/ high-contrast, font size (bad?); ?
* Document layer: tagged PDFs, well-structured semantic PDFs, Word documents, HTML documents.
 
== What JAWS says ==
 
[[Wikipedia:Screen reader|Screen readers]] are assistive software that verbalise (via synthesised speech, braille display or both) text displayed on a computer screen from the operating system (Windows and so on) or applications (typically Web browsers, word processors, email software).
JAWS (Job Access With Speech) for Windows is a popular screen reader from [http://freedomscientific.com/ Freedom Scientific]; competitors include Window-Eyes from GW Micro, HAL from Dolphin, and [http://www.screenreader.net Thunder] (free for personal use - please try).
 
First, to clear up common mis-conceptions:
* Screen readers do NOT request pages directly, they work through a browser, often Internet Explorer.
* They DO try to deal with Javascript and style sheets (with the "screen" media attribute). So 'noscript' elements are not read.
* Screen readers can be configured/scripted for different levels of verbosity, different applications and so on. However, many users concentrate on learning the keyboard shortcuts and don't know or don't have the confidence to change the configuration. Expert evaluation therefore assumes that the default configuration is used.
* In default configuration JAWS does NOT read TITLE attributes. Always use ALT for images.
* Most screen readers have a 'virtual buffer' to allow keyboard shortcuts for headings, lists, forms. This can be a problem for Javascript.
...
[Too much accessibility]
 
Below are examples of what the JAWS for Windows 7 screen reader verbalises for good and bad markup (HTML).
 
 
=== Forms ===
 
JAWS and other screen readers have a ''forms mode'' to allow the user to input text in forms in a Web browser.
 
== Accessibility design patterns ==
 
=== Pattern 1: unlist, inline-list ===
 
Cascading style sheet (CSS) classes to remove default list-styles from HTML lists.
Class <code>inline-list</code> also makes a list horizontal.
 
* Warnings: none - please use!
* Difficulty: '''easy''' I hope.
* Context: Moodle contains lots of list - typically look for <code>foreach</code> loops.
* Principle: [http://www.w3.org/TR/WAI-WEBCONTENT/#gl-structure-presentation WCAG1 Guideline 3.6 - Mark up lists and list items properly].
* Available: ? Moodle 1.8 December 2006 (MDL-6838, nested lists are safe).
* Use count: 5+ (12 including deprecated <code>list</code>).
* Definition, CSS: <code>theme/standard/styles_layout.css</code>
.unlist, .inline-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sideblock .content .inline-list li {
  display: inline;
}
 
* Examples, PHP/HTML: <code>blocks/../block_blog_tags.php</code>
<nowiki>$this->content->text .= "<ul class='inline-list'>";
foreach ($etags as $tag) {
    $this->content->text .= '<li><a href="'.$link.'" ... >'.$tag->name.'</a></li> ';
}
$this->content->text .= "</ul>";</nowiki>
 
<nowiki><ul class="inline-list">
  <li><a .. class=" s20">Accessibility</a></li>
  <li><a .. class=" s10">Test</a></li>
</ul></nowiki>
 
 
[Problem, Context, Principle, Solution, Why, Examples]
 
=== Pattern 2: accesshide ===
 
CSS class for text to be 'seen' by screen readers but not visual users.
 
Text classed as <code>accesshide</code> provides context for a non-sighted user, where the context or meaning would only otherwise be clear from formatting, for example coloured text, or a [[#Pattern 3: left, right arrows|''silent'' character]]. The example below shows how additional text is provided to differentiate ''today'' from the other days in the Moodle calendar - visual differentiation is provided in the ''standard'' theme by a black border, and the <code>accesshide</code> text is duplicated, in this case using Javascript (TODO: modify code! Javascript should use the title attribute.)
 
* Warning: this is a '''hack''', we prefer visible text - use cautiously (most necessary uses have already been identified), and consult before use.
* Warning: '''NOT''' for links - see [[#Pattern 4: skip link|skip link]] pattern below.
* Difficulty: '''tricky''' &mdash; please put the same text in an adjacent/parent <code>title</code> attribute.
* Also know as: offscreen/ off-screen hidden text.
* Context: provides context for a non-sighted user, where the meaning would otherwise be clear from formatting.
* Principle: [http://w3.org/TR/WCAG10/#gl-color WCAG10, Guideline 2 - don't rely on colour alone].
* Available: Moodle 1.6 March 2006.
* Bugs: 30-May-06, fixed [http://tracker.moodle.org/browse/MDL-5628 MDL-5628] for [[Wikipedia:Internet Explorer|IE 6]] Farsi [[Wikipedia:Right to left|RTL]] language.
* Use count: 29+ !
* Solution, CSS: <code>theme/standard/styles_layout.css</code>
.accesshide {
  position: absolute;
  top: -1000px;
}
 
* Solution, PHP: <code>lib/weblib.php</code> (available Moodle 1.9)
<nowiki>// @return string HTML
function get_accesshide($text, $elem='span', $class='', $attrs='')</nowiki>
 
* Examples, HTML: <code>calendar/lib.php</code>
<nowiki>...
<td class="day">26</td>
<td class="day today">
  <span class="accesshide">Today Friday, 27 April </span>
  <a onmouseover="return overlib(.. 'Today Friday, 27 April')" ..>27</a>
</td>
<td class="weekend day">28</td>
...</nowiki>
 
=== Pattern 3: left, right arrows ===
 
PHP variables holding 'silent' representations of right and left arrows (example ► <code>&amp;#x25BA;</code>), to avoid misuse of characters including "greater than" >, "right angle quote" ». The variables are initialised by the function weblib.php: check_theme_arrows, unless they have first been defined in the theme config.php.
 
* Difficulty: medium. Careful with fonts.<br />
* Available: Moodle 1.7
* Functions in <code>lib/weblib.php</code>
<nowiki>
function check_theme_arrows()
function link_arrow_right($text, $url='', $accesshide=false, $addclass='')
function link_arrow_left($text, $url='', $accesshide=false, $addclass='')
function get_separator()
 
$THEME->rarrow
$THEME->larrow </nowiki>
 
* Associated CSS in <code>theme/standard/styles_fonts.css</code>
.arrow, .arrow_button input {
  font-family: Arial,Helvetica,Courier,'Arial Unicode MS',sans-serif;
}
 
* Use count: ?
* Example PHP: weblib.php function print_navigation - breadcrumb trail.
 
 
=== Pattern 4: skip link ===
 
* Warnings: we prefer links to be visible.
* Difficulty: medium. <code>:active</code> is a hack for IE 6.
* Problem: keyboard-only users have large numbers of links to contend with in Moodle.
* Context: side blocks, home page and course pages.
* Principle: [http://w3.org/TR/WAI-WEBCONTENT/#gl-facilitate-navigation WCAG1 Guideline 13.6 - Group related links... and, until user agents do so, provide a way to bypass the group].
* Available: Moodle 1.9, October 2007.
* Use count:
* Solution 1, CSS: ('''only''' for comparison)
a.skip                      { color: white; }
a.skip:focus, a.skip:active { color: black; }
 
* Solution 2, CSS: <code>theme/standard/styles_layout.css</code> ('''used''' in Moodle 1.9)
a:skip      { position: absolute; top: -1000em; }
a.skip:focus, a.skip:active { position: static; }
 
* Plus, in each case:
.skip-destination, .skip-to { display: block; height: 1px; }
 
* Examples:
 
 
 
* Also: Weekscss course format, Moodleforms, img-text class .
 
[[Category:Accessibility]]

Latest revision as of 04:53, 24 May 2019

Warning: This page is no longer in use. The information contained on the page should NOT be seen as relevant or reliable.


This page has been replaced because the content was no longer applicable to the current version of Moodle.

Current documentation can be found here:

"Accessibility in Moodle"

The previous version of this document can be seen in the history