- CAPTCHAs are important for preventing DDoS attacks, as they prevent botnets from accessing processor-intensive parts of websites such as login forms. But they can give false positives, where CAPTCHAs filter out humans, which is particularly bad in the COVID-19 era where it is essential to be able to access services virtually. The article goes on to describe the history of CAPTCHA development:
- reCAPTCHA is a CAPTCHA service company that was acquired by Google; it accounts for around 93% of all CAPTCHAs on the web.
- Early versions of CAPTCHA software had users deciphering distorted words and numbers, and typing these into a box. These should no longer be used today, as they are entirely visual and therefore inaccessible to users with visual impairments.
- reCAPTCHA version 2, released in 2014, analyses the way the cursor moves across the screen to determine whether the motion is likely to be human. If it isn’t, it presents the user with an audio or visual challenge, such as clicking images which contain fire hydrants.
- reCAPTCHA version 3 was released in 2018; it eliminates user challenges altogether and returns a “probability score” indicating the likelihood the user is human. It is up to the developers to take extra steps if the score is low, e.g. authenticate the user through an email link.
- The article closes by asking developers not to roll out their own CAPTCHA solutions, which are likely to be less accessible than the industry standards.
- A really interesting article by Microsoft that is not (as I suspected from the headline) your typical “how to write good alt text” article.
- A recent Microsoft study found that users who rely on alt text want different alt text depending on the context of the image:
- “For example, if a photo of a person appeared in a news story, people might want a description that includes details about the setting of the image to give a sense of place. But if a photo of a person appeared on a social media or dating website, people might want increased details about that person’s appearance, including some details that may be subjective and/or sensitive, such as race, perceived gender, and attractiveness”.
- “One participant mentioned that knowing the race and gender of people in photos of board members on an employer/employment website might help them understand whether the company values a diverse workplace. These latter examples illustrate practical and ethical challenges for emerging AI systems, such as whether AI systems can – or should – be trained to provide subjective judgments or information about sensitive demographic attributes.”
- The article includes a table of contexts (such as e-commerce, news, dating) cross-checked against properties in an image that would be important to include in the alt text (e.g. weather, expression, hair colour), as indicated by the study’s participants.
- Microsoft concludes that new categories of metadata should be produced to feed into improved machine learning models, and there should be “custom vision-to-language models” that give different alt text depending on the context in which an image appears.
Next up is a Steve Faulkner special, as I’ve had two of his blog posts bookmarked for some time!
- re-upped: placeholder – the piss-take label
- Steve confirms that use of the
placeholderattribute alone, in absence of a
label, fails Success Criterion 3.3.2: Labels or Instructions. The problems with
placeholderare summarised nicely in one paragraph:
- “While the hint given by the controls label is shown at all times, the short hint given in the placeholder attribute is only shown before the user enters a value. Furthermore, placeholder text may be mistaken for a pre-filled value, and as commonly implemented the default color of the placeholder text provides insufficient contrast and the lack of a separate visible label reduces the size of the hit region available for setting focus on the control.”
- This bonus article from HTMHell adds that translation tools such as Google Translate may not translate attribute values, placeholder text gets cut off beyond the size of the field, and “if browsers auto-fill fields, users have to cut-and-paste auto-filled values to check if browsers filled in fields correctly”.
- Steve confirms that use of the
- aria-description: By Public Demand and to Thunderous Applause
- The new
aria-descriptionattribute coming to WAI-ARIA 1.3 is similar to
aria-label(takes a string of text associated with an element), but is intended for more verbose information. Steve sees it as replacing
aria-describedbyin those cases where the linked element is visually hidden, i.e.
<a href="#" aria-describedby="help">Help</a><div id="help" class="visually-hidden">This description is for screen reader users only</div>.
- It’s supported in Chrome, Firefox and Edge already.
- Steve closes with some advice: for
aria-label, a word or phrase is better than a sentence, and for
aria-description, a sentence is better than a paragraph.
- The new
- At the end of March, Apple worked with Warner Music to launch the “Saylists” feature on Apple Music. This feature helps users find songs with lyrics and sounds which can be challenging to vocalise if you have a speech-sound disability/disorder (SSD), as one in 12 children in the UK do. Getting people with SSD to repeat hard and challenging sounds (such as words beginning with “ch”, “g”, “k” and “z”) is one of the most successful strategies to treat the disorder.
- Lawrence Weru discusses the Clubhouse app and what it is like as a person with a stutter. The invite-only app can gather over 1,000 people together in “rooms” for voice chats, where you can raise a ‘hand’ to ask to speak on the stage. He describes the anxiety stutterers feel when ‘raising the hand’ to speak on Clubhouse, and the instinct to just stay silent.
- Lawrence has listened to several hours of Clubhouse conversations per week, but it was 49 days before he heard someone with a stutter take to the stage. To put that into context, around 15% of Americans have a speech/language/voice disorder, often starting between the ages of 2 and 6, with a 1 in 4 chance of it staying for life.
- There is an increasing reliance on voice to interact with technology, making life difficult for stutterers: automated phone systems which require specific words without substitution, and Siri/Alexa which misinterpret pauses in speech as the end of the command. Clubhouse, and Twitter’s similar new “Spaces” feature, are continuing the move towards real-time voice. There’s an unfortunate lack of suggested solutions in the article, but it is worth a read to be made aware of the issue.
- Microsoft estimates that 60 million people use Windows High Contrast Mode (WHCM) regularly. The mode is under-tested compared to VoiceOver, which Adrian Roselli claims is over-represented. Marcus Herrmann shares his tips for developers wanting to test WHCM on their Apple machines:
- Download VirtualBox.
- Get a Windows 10 virtual machine (VM).
- Write down the Windows admin password – which is
Passw0rd!– as you’ll be asked for it a lot.
- Launch VirtualBox and select your virtual machine. Optional: use VirtualBox to take a restorable ‘snapshot’ as soon as you’ve got it working, as the Windows license on these VMs expire after 90 days.
- To activate WHCM, click on the search field next to the Start button and search for “high contrast”.
- Marcus notes that there are 4 High Contrast themes available in Windows 10: “High Contrast Black”, “High Contrast White”, “High Contrast #1” and “High Contrast #2”. You should ideally test in each.
- Lisa Irving filed a complaint against Uber in 2018, after, on multiple occasions, being denied a ride or being harassed by Uber drivers not wanting to transport her and her guide dog. An independent arbitrator this month ruled in her favour, ordering Uber to award her £790,000, or $1.1 million.
- Ms Irving’s lawyers said: “Of all Americans who should be liberated by the rideshare revolution, the blind and visually impaired are among those who stand to benefit the most. However, the track record of major rideshare services has been spotty at best and openly discriminatory at worst”.
- Uber had claimed that it wasn’t liable for its drivers conduct because they were contractors. This has been struck down in the UK after a lengthy legal battle, and was dismissed by the arbitrator, who concluded that Uber still had contractual supervision over the drivers.
- Eric Bailey reminds us that we should always finish our alt text with punctuation, such as a full stop/period. This makes the screen reader voice pause slightly before announcing the next words in the sequence, which feels a lot more natural. Example code:
<img src="puppy.jpg" alt="A golden retriever puppy wearing a tiny raincoat." />
- Live Captions, Google’s real-time captioning feature, is available now on Chrome. The technology, which first appeared on Pixel phones in 2019, has captions appearing as a small, movable box at the bottom of the browser. The captions are generated in real time from the sound of the audio, so there is a slight delay and a fair few mistakes, but it is still a useful feature, and works offline too.
- “Live Captions can be enabled in the latest version of Chrome by going to Settings, then the Advanced section, and then Accessibility.”
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