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Vernon Fowler

Don't Rely on Default Browser Error Messages - Intopia - 0 views

  • Another issue is that the messages are temporary. As soon as you put focus on the input with mouse, keyboard or touch, the message disappears. People with cognitive impairments will find it difficult to use these, and I think anyone trying to fill in the form while they’re distracted will have trouble as well. People who rely on the keyboard for navigation (which includes both sighted users and screen reader users) will also lose these messages as they move around the form.
  • If you’re confident of your error messages, you can remove the browser validation by adding the novalidate attribute to the wrapping form element, like this: <form novalidate>...</form>
  • You can style this with CSS, using the :valid and :invalid pseudo-classes
  • ...2 more annotations...
  • Only the first error is noted with a message.
  • The rest rely on a change of border colour, which is, again, not evident to screen reader users.
  •  
    "When I found out the major browsers were beginning to include error validation into their support for forms, I was pretty excited. Form validation is always a fiddly part of accessibility, so I'm always looking out for ways to make it easier for developers to do properly. I read MDN's form data validation tutorial and a CSS Tricks article on client-side form validation and immediately made some test forms. Sadly, I was disappointed with the results. The default error validation in browsers is almost completely inaccessible. I was hoping we'd get default "you've forgotten to fill this in" messages that could be customised. I might have been a bit too optimistic! Validation at the browser level has many of the same issues we find at the website level."
Vernon Fowler

Hiding Content for Accessibility - Snook.ca - 0 views

  • This clip technique is also what's provided in the .visuallyhidden helper class in HTML5 Boilerplate.
  • We've only begun using and testing this technique, so even this may not be perfect. Any feedback and suggestions are quite welcome.
Vernon Fowler

Places It's Tempting To Use Display: None; But Don't | CSS-Tricks - 0 views

  • I recently heard a heartbreaking story about a blind girl trying to apply for college and the form had missing labels so she had no idea what to put in what fields.
  • @media queries Turning on Voice Over in OS X and using Safari is a screen reader. Now imagine that Safari window was open to a very narrow width and the page had some @media queries for handling smaller viewports. And say that @media query hides some things with display: none in order to better visually accomodate the space. This could be good or bad for accessibility. Are you hiding a bunch of crap that isn't important to the page? Or are you hiding useful things that a person using a screen reader should have access to like they normally would.
Vernon Fowler

html5-boilerplate/css/main.css at master · h5bp/html5-boilerplate · GitHub - 0 views

  • /* * Hide from both screenreaders and browsers: h5bp.com/u */.hidden {    display: none !important;    visibility: hidden;}/* * Hide only visually, but have it available for screenreaders: h5bp.com/v */.visuallyhidden {    border: 0;    clip: rect(0 0 0 0);    height: 1px;    margin: -1px;    overflow: hidden;    padding: 0;    position: absolute;    width: 1px;}/* * Extends the .visuallyhidden class to allow the element to be focusable * when navigated to via the keyboard: h5bp.com/p */.visuallyhidden.focusable:active,.visuallyhidden.focusable:focus {    clip: auto;    height: auto;    margin: 0;    overflow: visible;    position: static;    width: auto;}/* * Hide visually and from screenreaders, but maintain layout */.invisible {    visibility: hidden;}
Vernon Fowler

A List Apart: Articles: Now You See Me - 0 views

  • visibility: hidden; Element is hidden from view, but is not removed from the normal flow (i.e., it still takes up the space it normally would) Content is ignored by screen readers display: none; Element is removed from the normal flow and hidden; the space it occupied is collapsed Content is ignored by screen readers height: 0; width: 0; overflow: hidden; Element is collapsed and contents are hidden Content is ignored by screen readers
  • if you want to ensure users have access to content (even if it isn’t displayed visually in the current interface), the final option (positioning content offscreen) is really the way to go.
  • Screen readers have access to the content
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  • position: absolute; left: -999em;
  • but links may “focus” oddly and negative indent may not prove long enough to fully hide content
  • limited to text and inline elements
  • Content is removed from the normal flow and shifted off the left-hand edge; the space it occupied is collapsed
    • Vernon Fowler
       
      This is usually my desired effect.
  • If you don’t want your hidden content to be read by a screen reader, those defaults may work for you
  • how profoundly your choice of hiding mechanism can influence the accessibility of your content to assistive technologies like screen readers
Vernon Fowler

WordPress › WP Accessibility « WordPress Plugins - 0 views

  • Remove the target attribute from links
  • Remove redundant title attributes
  • Add post titles to standard "read more" links
Vernon Fowler

WebAIM: Creating Accessible Forms - General Form Accessibility - 0 views

  • Screen reader users generally navigate through a form using the Tab key to jump from form control to form control. Associated form labels are read for each form control when the user navigates to them. Any non-label text content between the form controls is usually skipped over. Be sure to include important cues or instructions in associated labels or at the beginning of the form.
Vernon Fowler

Accessible forms using WCAG 2.0 | Web Usability - 0 views

  • The label element is not used for the following because labels for these elements are provided via the value attribute
  • This technique inserts new content into the DOM immediately following the element that was activated to trigger the script. The triggering element must be a link or a button, and the script must be called from its onclick event. These elements are natively focusable, and their onclick event is device independent. Focus remains on the activated element and the new content, inserted after it, becomes the next thing in both the tab order and screen-reader reading order. Note that this technique works for synchronous updates. For asynchronous updates (sometimes called AJAX), an additional technique is needed to inform the assistive technology that the asynchronous content has been inserted.
Vernon Fowler

Image ALT Tag Tips for HTML | AccessAbility - 0 views

  • Alt text with acronyms should be written with spaces in between letters. For instance, <alt="I T S at P S U" > (read by a screen reader as "ITS at PSU")
  • While there is no official length restriction on the length of alt text, many experts recommend 125 characters or fewer because of restrictions within the JAWS screen reader.
  • LONGDESC has incomplete support among both visual browsers and screen readers, and is deprecated in HTML5.
Vernon Fowler

Creating an Accessible Infographic | Access Matters Blog - 0 views

  • Screen readers are very literal and, as such, tend to read out numbers in a list with no particle words or punctuation.
  • Using a CSS technique to position text off the screen, it’s simple to add some particle words (such as “from” or “to”) for screen reader users. In the case of a range of numbers, the dashes can be presented using graphics and not part of the text content of the page. For example, in the second data point shown in the image below, instead of a screen reader announcing “twenty-six percent fifty-five sixty-four” it would be “twenty six percent fifty-five to sixty-four.”
  • Another example is implied headings. Sighted users can understand quickly from images that a data set title should be “gender” but if the heading doesn’t appear in the design, it should be added and visually hidden using CSS.
Vernon Fowler

RGD Launches Best Practices Handbook at DesignThinkers 2010 | Access Ability - 0 views

  • Available in both printed and accessible pdf formats, the handbook is free to anyone interested in designing more accessible and inclusive communications. Covering print, web and environmental design, it offers ideas on how to do better design – what factors to consider, what questions to ask, and where to find more information.
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Guest Post Online - 0 views

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