writing great alt text
TRANSCRIPT
Writing great alt textWhitney QuesenberyCenter for Civic Design@civicdesign | @whitneyq | @awebforeveryone
The basicsAlt means alternative
Alt text is...A principle of accessibility
Web Content Accessibility Guidelines 2.0
Principle 1: Perceivable
Information and user interface components must be presentable to users in ways they can perceive.
Alt text is...A requirement for accessibility
Web Content Accessibility Guidelines 2.0
Guideline 1.1 Text Alternatives: Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language.
Alt text is...Code. Specifically, an attribute in the image element
<img src="tickets.jpg" alt="#A11YSUMMIT. Buy tickets">
Alt text is...Part of appealing to all senses.
Images – alternative text Video – captions and video descriptions
action Audio - transcripts
An accessible UX principle: Accessible Media: Appeal to all SensesA Web for Everyone by Sarah Horton and Whitney Quesenberyhttp://rosenfeldmedia.com/books/a-web-for-everyone/
Because technology needs itScreen readers (and other assistive technology) can't interpret the meaning of the image without it.
<img src="fb.jpg"><img src="twitter.jpg"><img src="li-logo-square.jpg"><img src="g.jpg><img src="btn1875412.jpg"
Because people need it
People who use screen readers and other AT
When images are missing or turned off
For translations
Jacob Vishnu
MariaTrevor
Personas from A Web for Everyone by Sarah Horton and Whitney Quesenberyhttp://rosenfeldmedia.com/books/a-web-for-everyone/resources/
The problemWhy are we (still) talking about alt text?
Alt text is invisible content It's hard to tell if it's good or
bad...or even it it's there. Even bad alt text passes some
accessibility checkers.
Banner Ad<img src="banner-ad-176987362334876292.jpg" alt="banner-ad-176987362334876292.jpg">
The tools don't helpThey ask for the information at the wrong time, and in the wrong way.
Or they are tedious.And repetitive.
Why isn't it an easy part of creating content?
See the alt text in context.
Have a sticky window where it's easy to edit at any time
More ideas?
Jacob is working at a computer, using a Braille note keypad. He has earphones on listening to something, and has dark glasses.
Trevor sits...
The usual rulesA simple way to decide how to write alt text
The simplest guidelineStart with this question:
What information does this image add?
Does the page make sense without it?
What kind of information is it?
If the image contains
<img src="useless image" alt="">
Text Repeat the words
Visual information Explain it Sensory information Describe it Nothing new Ignore it
A simple decision tree
What is the role of the image? Decorative? Use null alt text or CSS Sensory? Write a descriptive
identificaation Informative?
No new info? Use null alt text Simple or a link? Write short alt text Complex image? Create long text
Section of the same page Linked page Longdesc
4 Syllables - http://www.4syllables.com.au/2010/12/text-alternatives-decision-tree/
Or, a detailed analysis
HTML5: Techniques for providing useful text alternatives (updated Sept 8, 2014) http://rawgit.com/w3c/alt-techniques/master/index.html
On the HTML5 standards horizon:<figure> and <figcaption>
Keeps the image, alt text, and caption together
<figure><img src="castle-painting.jpg" alt="The castle now has two towers and two walls."> <figcaption>Oil-based paint on canvas. Eloisa Faulkner, 1756.</figcaption></figure>
Example from: http://rawgit.com/w3c/alt-techniques/master/index.html#m6
A writer's approachStart with a content strategy
Know your audience What knowledge or background
do they have? What terminology will they
know?
<img alt="Molecular structure of diethyl diazenedicarboxylate">
Context, not just rules What is the reader's goal?
How does the image fit into the page?
What other information is around the image?
What is noise? What is important?
1. Icons for categories2. Bookmark3. Hero image4. Title5. Description
Create a consistent 'voice'Make the alt text part of the (stylistic) voice of the site, in how images are voiced (by assistive technology).
Functional?Descriptive?Emotional?
Consider the foxWhat should the alt text for this image be?
Image Credit: J. and K. Hollingsworth/USFWS
What if we see it on this page?The text on page shown in the image saysRed Fox (Vulpes vulpes) DescriptionRed foxes are a rusty reddish color on the upper side of their body and tail. They have a white underside, chin and throat. Their tail is very bushy with a characteristic white tip, and they have prominent pointed ears. The backs of the ears, lower legs and feet are black. Other than the common rusty red, red foxes have three different color variations: a black phase where they are almost completely black, a silver phase in which they are black with silver-tipped hairs, and a "cross" phase where individuals are reddish brown with a dark cross across their shoulders. Adults typically stand 15 to 16 inches from the ground and are 35 to 41 inches in length. They can weigh between 8 and 15 pounds.
Examples...examples...and more examples
Get the basics right
Repeat the text in the image.Alt text: “Webcast. Applying 21st Century Toxicology to Green Chemical and Material Design. September 20-21, 2011”
Don't create images of textBonus: makes it more responsive as well
Get the basics rightIdentify the target of a link Do these social media
images go to the organizations' pages,
Or are they share links?
Alt text: “UXPA group on Facebook”"@UXPA_Int on Twitter""UXPA's LinkedIN profile"
Don't create noiseWhen images are used like a bullet, they can have empty alt text.If they are clickable make them part of the text link.
Don't hide meaningful imagesIs a profile photo part of the content?
<img alt="Photo of Caroline">or<img alt="Caroline Jarrett">
Make captions & alt text work togetherThe caption:“Figure 1. Meetings of the branch of UXPA China in Qingdao (photo by the author)”
The alt text: “A small group of people around a table.”
Don't hide information in the alt text
Caption: Red fox, credit: John & Karen Hollingsworth
Alt text: Red Fox as Sachuest Point NWR. Credit J and K Hollingsworth
Don't just repeat the same text
Caption and alt text both say:Gerald Chan is an alumnus of the public health school, having earned master’s and doctorate degrees in the 1970s
Consider the surrounding textThe caption:“Figure 1: The ABC of research methods”
The alt text: “ABC diagram.”or "ABC diagram sketched on a chalkboard.”or“A diagram sketched on a chalkboard as a triangle. Top: Attitude. Right: Behavior. Left: Comprehension.
When the text is long...Put the text on the same page, and link to it.
The alt text: “Two personas"
The caption includes a link:“Read the text in this image”
The text is in a box at the end of the article.
The caption reads: Example snapshots of personas demonstrate Spanish-speaking users’ language needs and preferences, as well as medical literacy, web skills, and other relevant characteristics. Read the text in this image."
The link points to a grey box below
When the information is in a chart...Combine the visual chart with a data table.
The alt text:"Bar chart of data in table below"
The title:"More Education Means More Money"http://www.careerinfonet.org/finaidadvisor/earnings.aspx?nodeid=21
When the text is in an infographic..Design the infographic in HTML and CSS so the text is text.
Not as easy to do, but a better experience for everyone.
http://simplyaccessible.com/article/text-is-text/ andhttp://apps.washingtonpost.com/g/page/national/the-health-hazards-of-sitting/750/
WorkflowMake alt text part of the writing process
How long should alt text be?
No more than a few words? (WebAIM)
5-15 words? (Many sources)
30-50 words (2-3 sentences)?(W3C Draft)
Keep it concise
Focus on the important words (no prizes for writing long prose).
Avoid noise words "Image of.. " "This is a..."
Be consistentEach image, each page, each section is all part of your site or app.
Use the same approach everywhere, especially for functional elements: Providing additional text Locating explanatory text or
data Identifying figures in the text
Write the text, caption, alt text together Hiding the image in the manuscript makes
it easier to visualize the flow of the words.
This is the text in the image:...mall, we realized that even everyday items such as clothing and shoes would also be bought in installments (see Figure 1). A light bulb went off for us—not only was it common to pay in installments, but it applied to items we did not expect, too. Alt text: Picture of shoes with installment pricing signFigure 1. In a mall in Sao Paulo, our research team spotted more items sold in installments than we initially expected. Notice that the installment price is more visually prominent than the total price!
Add alt text to the writing workflow
This is change!
Admit it Embrace it Set a reasonable pace
Rome wasn't built in a day(but if you don't start, you never get there)
Make the web a better place.
Write some (great) alt text today!
Storytelling for User Experiencewith Kevin BrooksGlobal UXwith Daniel SzucA Web for Everyonewith Sarah Hortonhttp://rosenfeldmedia.com/books/a-web-for-everyone/
Thank you.