Tags: ia



Tuesday, October 27th, 2020


Sara tweeted something recently that resonated with me:

Also, Pro Tip: Using ARIA attributes as CSS hooks ensures your component will only look (and/or function) properly if said attributes are used in the HTML, which, in turn, ensures that they will always be added (otherwise, the component will obv. be broken)

Yes! I didn’t mention it when I wrote about accessible interactions but this is my preferred way of hooking up CSS and JavaScript interactions. Here’s old Codepen where you can see it in action:

[aria-hidden='true'] {
  display: none;

In order for the functionality to work for everyone—screen reader users or not—I have to make sure that I’m toggling the value of aria-hidden in my JavaScript.

There’s another advantage to this technique. Generally, ARIA attributes—like aria-hidden—are added by JavaScript at runtime (rather than being hard-coded in the HTML). If something goes wrong with the JavaScript, the aria-hidden value isn’t set to “true”, which means that the CSS never kicks in. So the default state is for content to be displayed. There’s no assumption that the JavaScript has to work in order for the CSS to make sense.

It’s almost as though accessibility and progressive enhancement are connected somehow…

Friday, October 23rd, 2020

This page is a truly naked, brutalist html quine.

I think this is quite beautiful—no need to view source; the style sheet is already in the document.

Thursday, October 22nd, 2020

Accessibility Support

A very handy community project that documents support for ARIA and native HTML accessibility features in screen readers and browsers.

Wednesday, October 21st, 2020

Accessible interactions

Accessibility on the web is easy. Accessibility on the web is also hard.

I think it’s one of those 80/20 situations. The most common accessibility problems turn out to be very low-hanging fruit. Take, for example, Holly Tuke’s list of the 5 most annoying website features she faces as a blind person every single day:

  • Unlabelled links and buttons
  • No image descriptions
  • Poor use of headings
  • Inaccessible web forms
  • Auto-playing audio and video

None of those problems are hard to fix. That’s what I mean when I say that accessibility on the web is easy. As long as you’re providing a logical page structure with sensible headings, associating form fields with labels, and providing alt text for images, you’re at least 80% of the way there (you’re also doing way better than the majority of websites, sadly).

Ah, but that last 20% or so—that’s where things get tricky. Instead of easy-to-follow rules (“Always provide alt text”, “Always label form fields”, “Use sensible heading levels”), you enter an area of uncertainty and doubt where there are no clear answers. Different combinations of screen readers, browsers, and operating systems might yield very different results.

This is the domain of interaction design. Here be dragons. ARIA can help you …but if you overuse its power, it may cause more harm than good.

When I start to feel overwhelmed by this, I find it’s helpful to take a step back. Instead of trying to imagine all the possible permutations of screen readers and browsers, I start with a more straightforward use case: keyboard users. Keyboard users are (usually) a subset of screen reader users.

The pattern that comes up the most is to do with toggling content. I suppose you could categorise this as progressive disclosure, but I’m talking about quite a wide range of patterns:

  • accordions,
  • menus (including mega menu monstrosities),
  • modal dialogs,
  • tabs.

In each case, there’s some kind of “trigger” that toggles the appearance of a “target”—some chunk of content.

The first question I ask myself is whether the trigger should be a button or a link (at the very least you can narrow it down to that shortlist—you can discount divs, spans, and most other elements immediately; use a trigger that’s focusable and interactive by default).

As is so often the case, the answer is “it depends”, but generally you can’t go wrong with a button. It’s an element designed for general-purpose interactivity. It carries the expectation that when it’s activated, something somewhere happens. That’s certainly true in all the examples I’ve listed above.

That said, I think that links can also make sense in certain situations. It’s related to the second question I ask myself: should the target automatically receive focus?

Again, the answer is “it depends”, but here’s the litmus test I give myself: how far away from each other are the trigger and the target?

If the target content is right after the trigger in the DOM, then a button is almost certainly the right element to use for the trigger. And you probably don’t need to automatically focus the target when the trigger is activated: the content already flows nicely.

<button>Trigger Text</button>
<div id="target">
<p>Target content.</p>

But if the target is far away from the trigger in the DOM, I often find myself using a good old-fashioned hyperlink with a fragment identifier.

<a href="#target">Trigger Text</a>
<div id="target">
<p>Target content.</p>

Let’s say I’ve got a “log in” link in the main navigation. But it doesn’t go to a separate page. The design shows it popping open a modal window. In this case, the markup for the log-in form might be right at the bottom of the page. This is when I think there’s a reasonable argument for using a link. If, for any reason, the JavaScript fails, the link still works. But if the JavaScript executes, then I can hijack that link and show the form in a modal window. I’ll almost certainly want to automatically focus the form when it appears.

The expectation with links (as opposed to buttons) is that you will be taken somewhere. Let’s face it, modal dialogs are like fake web pages so following through on that expectation makes sense in this context.

So I can answer my first two questions:

  • “Should the trigger be a link or button?” and
  • “Should the target be automatically focused?”

…by answering a different question:

  • “How far away from each other are the trigger and the target?”

It’s not a hard and fast rule, but it helps me out when I’m unsure.

At this point I can write some JavaScript to make sure that both keyboard and mouse users can interact with the interactive component. There’ll certainly be an addEventListener(), some tabindex action, and maybe a focus() method.

Now I can start to think about making sure screen reader users aren’t getting left out. At the very least, I can toggle an aria-expanded attribute on the trigger that corresponds to whether the target is being shown or not. I can also toggle an aria-hidden attribute on the target.

When the target isn’t being shown:

  • the trigger has aria-expanded="false",
  • the target has aria-hidden="true".

When the target is shown:

  • the trigger has aria-expanded="true",
  • the target has aria-hidden="false".

There’s also an aria-controls attribute that allows me to explicitly associate the trigger and the target:

<button aria-controls="target">Trigger Text</button>
<div id="target">
<p>Target content.</p>

But don’t assume that’s going to help you. As Heydon put it, aria-controls is poop. Still, Léonie points out that you can still go ahead and use it. Personally, I find it a useful “hook” to use in my JavaScript so I know which target is controlled by which trigger.

Here’s some example code I wrote a while back. And here are some old Codepens I made that use this pattern: one with a button and one with a link. See the difference? In the example with a link, the target automatically receives focus. But in this situation, I’d choose the example with a button because the trigger and target are close to each other in the DOM.

At this point, I’ve probably reached the limits of what can be abstracted into a single trigger/target pattern. Depending on the specific component, there might be much more work to do. If it’s a modal dialog, for example, you’ve got to figure out where to put the focus, how to trap the focus, and figure out where the focus should return to when the modal dialog is closed.

I’ve mostly been talking about websites that have some interactive components. If you’re building a single page app, then pretty much every single interaction needs to be made accessible. Good luck with that. (Pro tip: consider not building a single page app—let the browser do what it has been designed to do.)

Anyway, I hope this little stroll through my thought process is useful. If nothing else, it shows how I attempt to cope with an accessibility landscape that looks daunting and ever-changing. Remember though, the fact that you’re even considering this stuff means you care more than most web developers. And you are not alone. There are smart people out there sharing what they learn. The A11y Project is a great hub for finding resources.

And when it comes to interactive patterns like the trigger/target examples I’ve been talking about, there’s one more question I ask myself: what would Heydon do?

Van11y: Accessibility and Vanilla JavaScript - ES2015

Van11y (for Vanilla-Accessibility) is a collection of accessible scripts for rich interfaces elements, built using progressive enhancement and customisable.

Monday, October 19th, 2020

Continuous partial browser support

Vendor prefixes didn’t work. The theory was sound. It was a way of marking CSS and JavaScript features as being experimental. Developers could use the prefixed properties as long as they understood that those features weren’t to be relied upon.

That’s not what happened though. Developers used vendor-prefixed properties as though they were stable. Tutorials were published that basically said “Go ahead and use these vendor-prefixed properties and ship it!” There were even tools that would add the prefixes for you so you didn’t have to type them out for yourself.

Browsers weren’t completely blameless either. Long after features were standardised, they would only be supported in their prefixed form. Apple was and is the worst for this. To this day, if you want to use the clip-path property in your CSS, you’ll need to duplicate your declaration with -webkit-clip-path if you want to support Safari. It’s been like that for seven years and counting.

Like capitalism, vendor prefixes were one of those ideas that sounded great in theory but ended up being unworkable in practice.

Still, developers need some way to get their hands on experiment features. But we don’t want browsers to ship experimental features without some kind of safety mechanism.

The current thinking involves something called origin trials. Here’s the explainer from Microsoft Edge and here’s Google Chrome’s explainer:

  • Developers are able to register for an experimental feature to be enabled on their origin for a fixed period of time measured in months. In exchange, they provide us their email address and agree to give feedback once the experiment ends.
  • Usage of these experiments is constrained to remain below Chrome’s deprecation threshold (< 0.5% of all Chrome page loads) by a system which automatically disables the experiment on all origins if this threshold is exceeded.

I think it works pretty well. If you’re really interested in kicking the tyres on an experimental feature, you can opt in to the origin trial. But it’s very clear that you wouldn’t want to ship it to production.

That said…

You could ship something that’s behind an origin trial, but you’d have to make sure you’re putting safeguards in place. At the very least, you’d need to do feature detection. You certainly couldn’t use an experimental feature for anything mission critical …but you could use it as an enhancement.

And that is a pretty great way to think about all web features, experimental or otherwise. Don’t assume the feature will be supported. Use feature detection (or @supports in the case of CSS). Try to use the feature as an enhancement rather than a dependency.

If you treat all browser features as though they’re behind an origin trial, then suddenly the landscape of browser support becomes more navigable. Instead of looking at the support table for something on caniuse.com and thinking, “I wish more browsers supported this feature so that I could use it!”, you can instead think “I’m going to use this feature today, but treat it as an experimental feature.”

You can also do it for well-established features like querySelector, addEventListener, and geolocation. Instead of assuming that browser support is universal, it doesn’t hurt to take a more defensive approach. Assume nothing. Acknowledge and embrace unpredictability.

The debacle with vendor prefixes shows what happens if we treat experimental features as though they’re stable. So let’s flip that around. Let’s treat stable features as though they’re experimental. If you cultivate that mindset, your websites will be more robust and resilient.

Thursday, October 1st, 2020

Clamp | Utopia

Trys has been investigating how to incorporate CSS clamp() into the brilliant Utopia project. I won’t pretend to understand all the maths here—this is a very deep dive!

He’s also created a CSS generator Mark 2 if you want to use clamp() in your fluid type.

Monday, September 28th, 2020

The Empty Box | CSS-Tricks

This is an excellent framing for minimal viable products—what would the black box theatre production be?

Forget about all the production and complexity you could build. What’s the purpose you want to convey at the core?

Identify core functionality.

Wednesday, September 16th, 2020

When you browse Instagram and find former Australian Prime Minister Tony Abbott’s passport number

This was an absolute delight to read! Usually when you read security-related write-ups, the fun comes from the cleverness of the techniques …but this involved nothing cleverer than dev tools. In this instance, the fun is in the telling of the tale.

Sophie Zhang and The Social Dilemma | Revue

I watched The Social Dilemma last night and to say it’s uneven would be like saying the Himalayas are a little bumpy.

I’m shocked at how appealing so many people find the idea that social networks are uniquely responsible for all of society’s ills.

This cartoon super villain view of the world strikes me as a kind of mirror image of the right-wing conspiracy theories which hold that a cabal of elites are manipulating every world event in secret. It is more than a little ironic that a film that warns incessantly about platforms using misinformation to stoke fear and outrage seems to exist only to stoke fear and outrage — while promoting a distorted view of how those platforms work along the way.

Sunday, August 30th, 2020

The radium craze | Eric Bailey

The radioactive properties of React.

Tuesday, August 25th, 2020

The difference between aria-label and aria-labelledby - Tink - Léonie Watson

A handy reminder from Léonie (though remember that the best solution is to avoid the problem in the first place—if you avoid using ARIA, do that).

Thursday, August 20th, 2020

Service Workers | Go Make Things

Chris Ferdinandi blogs every day about the power of vanilla JavaScript. For over a week now, his daily posts have been about service workers. The cumulative result is this excellent collection of resources.

Thursday, August 13th, 2020

Гибкий веб-дизайн

Well, this is just wonderful! Students from Moscow Coding School are translating Resilient Web Design into Russian. Three chapters done so far!

This is literally the reason why I licensed the book with a Creative Commons Attribution‐ShareAlike license.

Sunday, August 9th, 2020


Fourteen years ago, I gave a talk at the Reboot conference in Copenhagen. It was called In Praise of the Hyperlink. For the most part, it was a gushing love letter to hypertext, but it also included this observation:

For a conspiracy theorist, there can be no better tool than a piece of technology that allows you to arbitrarily connect information. That tool now exists. It’s called the World Wide Web and it was invented by Sir Tim Berners-Lee.

You know those “crazy walls” that are such a common trope in TV shows and movies? The detectives enter the lair of the unhinged villain and discover an overwhelming wall that’s like looking at the inside of that person’s head. It’s not the stuff itself that’s unnerving; it’s the red thread that connects the stuff.

Red thread. Blue hyperlinks.

When I spoke about the World Wide Web, hypertext, apophenia, and conspiracy theorists back in 2006, conspiracy theories could still be considered mostly harmless. It was the domain of Dan Brown potboilers and UFO enthusiasts with posters on their walls declaring “I Want To Believe”. But even back then, 911 truthers were demonstrating a darker side to the fun and games.

There’s always been a gamification angle to conspiracy theories. Players are rewarded with the same dopamine hits for “doing the research” and connecting unrelated topics. Now that’s been weaponised into QAnon.

In his newsletter, Dan Hon wrote QAnon looks like an alternate reality game. You remember ARGs? The kind of designed experience where people had to cooperate in order to solve the puzzle.

Being a part of QAnon involves doing a lot of independent research. You can imagine the onboarding experience in terms of being exposed to some new phrases, Googling those phrases (which are specifically coded enough to lead to certain websites, and certain information). Finding something out, doing that independent research will give you a dopamine hit. You’ve discovered something, all by yourself. You’ve achieved something. You get to tell your friends about what you’ve discovered because now you know a secret that other people don’t. You’ve done something smart.

We saw this in the games we designed. Players love to be the first person to do something. They love even more to tell everyone else about it. It’s like Crossfit. 

Dan’s brother Adrian also wrote about this connection: What ARGs Can Teach Us About QAnon:

There is a vast amount of information online, and sometimes it is possible to solve “mysteries”, which makes it hard to criticise people for trying, especially when it comes to stopping perceived injustices. But it’s the sheer volume of information online that makes it so easy and so tempting and so fun to draw spurious connections.

This is something that Molly Sauter has been studying for years now, like in her essay The Apophenic Machine:

Humans are storytellers, pattern-spotters, metaphor-makers. When these instincts run away with us, when we impose patterns or relationships on otherwise unrelated things, we call it apophenia. When we create these connections online, we call it the internet, the web circling back to itself again and again. The internet is an apophenic machine.

I remember interviewing Lauren Beukes back in 2012 about her forthcoming book about a time-travelling serial killer:

Me: And you’ve written a time-travel book that’s set entirely in the past.

Lauren: Yes. The book ends in 1993 and that’s because I did not want to have to deal with Kirby the heroine getting some access to CCTV cameras and uploading the footage to 4chan and having them solve the mystery in four minutes flat.

By the way, I noticed something interesting about the methodology behind conspiracy theories—particularly the open-ended never-ending miasma of something like QAnon. It’s no surprise that the methodology is basically an inversion of the scientific method. It’s the Texas sharpshooter fallacy writ large. Well, you know the way that I’m always going on about design principles and they way that good design principles should be reversible? Conspiracy theories take universal principles and invert them. Take Occam’s razor:

Do not multiply entities without necessity.

That’s what they want you to think! Wake up, sheeple! The success of something like QAnon—or a well-designed ARG—depends on a mindset that rigorously inverts Occam’s razor:

Multiply entities without necessity!

That’s always been the logic of conspiracy theories from faked moon landings to crop circles. I remember well when the circlemakers came clean and showed exactly how they had been making their beautiful art. Conspiracy theorists—just like cultists—don’t pack up and go home in the face of evidence. They double down. There was something almost pitiable about the way the crop circle UFO crowd were bending over backwards to reject proof and instead apply the inversion of Occam’s razor to come up with even more outlandish explanations to encompass the circlemakers’ confession.

Anyway, I recommend reading what Dan and Adrian have written about the shared psychology of QAnon and Alternate Reality Games, not least because they also suggest some potential course corrections.

I think the best way to fight QAnon, at its roots, is with a robust social safety net program. This not-a-game is being played out of fear, out of a lack of safety, and it’s meeting peoples’ needs in a collectively, societally destructive way.

I want to add one more red thread to this crazy wall. There’s a book about conspiracy theories that has become more and more relevant over time. It’s also wonderfully entertaining. Here’s my recommendation from that Reboot presentation in 2006:

For a real hot-tub of conspiracy theory pleasure, nothing beats Foucault’s Pendulum by Umberto Eco.

…luck rewarded us, because, wanting connections, we found connections — always, everywhere, and between everything. The world exploded into a whirling network of kinships, where everything pointed to everything else, everything explained everything else…

Friday, August 7th, 2020

Rainbow spacecraft and how humanity might end (Interconnected)

I too am a member of The British Interplanetary Society and I too recommend it.

(Hey Matt, if you really want to go down the rabbit hole of solar sails, be sure to subscribe to the RSS feed of Centauri Dreams—Paul Gilster is big into solar sails!)

Friday, July 31st, 2020

Recreating Wildlife Photographer of the Year online – part 1 – Introduction and technical approach – Blogs from the Natural History Museum

You’ve seen the Wildlife Photographer Of The Year project from Clearleft’s viewpoint …and you’ve listened to the podcast episode, right?

Now here’s the story from the team that made the website. It’s a great walkthrough of thoughtfully evaluating technologies to figure out the best approach.

Sunday, July 19th, 2020

90s Festival Generator

I spent far too long hitting refresh and then clicking on the names of some of the Irish bands down near the bottom of the line-up.

Saturday, July 18th, 2020

An Introduction To Stimulus.js — Smashing Magazine

An intro to Stimulus, the lightweight JavaScript library from Basecamp that takes a progressive enhancement approach, as seen with HEY.

One aspect I really like about the approach Stimulus encourages, is I can focus on sending HTML down the wire to my users, which is then jazzed up a little with JavaScript.

I’ve always been a fan of using the first few milliseconds of a user’s attention getting what I have to share with them — in front of them. Then worrying setting up the interaction layer while the user can start processing what they’re seeing.

Furthermore, if the JavaScript were to fail for whatever reason, the user can still see the content and interact with it without JavaScript.

Tuesday, July 14th, 2020


There’s a new project from Igalia called Open Prioritization:

An experiment in crowd-funding prioritization of new feature implementations for web browsers.

There is some precedent for this. There was a crowd-funding campaign for Yoav Weiss to implement responsive images in Blink a while back. The difference with the Open Prioritization initiative is that it’s also a kind of marketplace for which web standards will get the funding.

Examples include implementing the CSS lab() colour function in Firefox or implementing the :not() pseudo-class in Chrome. There are also some accessibility features like the :focus-visible pseudo-class and the inert HTML attribute.

I must admit, it makes me queasy to see accessibility features go head to head with other web standards. I don’t think a marketplace is the right arena for prioritising accessibility.

I get a similar feeling of discomfort when a presentation or article on accessibility spends a fair bit of time describing the money that can be made by ensuring your website is accessible. I mean, I get it: you’re literally leaving money on the table if you turn people away. But that’s not the reason to ensure your website is accessible. The reason to ensure that your website is accessible is that it’s the right thing to do.

I know that people are uncomfortable with moral arguments, but in this case, I believe it’s important that we keep sight of that.

I understand how it’s useful to have the stats and numbers to hand should you need to convince a sociopath in your organisation, but when numbers are used as the justification, you’re playing the numbers game from then on. You’ll probably have to field questions like “Well, how many screen reader users are visiting our site anyway?” (To which the correct answer is “I don’t know and I don’t care”—even if the number is 1, the website should still be accessible because it’s the right thing to do.)

It reminds of when I was having a discussion with a god-bothering friend of mine about the existence or not of a deity. They made the mistake of trying to argue the case for God based on logic and reason. Those arguments didn’t hold up. But had they made their case based on the real reason for their belief—which is faith—then their position would have been unassailable. I literally couldn’t argue against faith. But instead, by engaging in the rules of logic and reason, they were applying the wrong justification to their stance.

Okay, that’s a bit abstract. How about this…

In a similar vein to talks or articles about accessibility, talks or articles about diversity often begin by pointing out the monetary gain to be had. It’s true. The data shows that companies that are more diverse are also more profitable. But again, that’s not the reason for having a diverse group of people in your company. The reason for having a diverse group of people in your company is that it’s the right thing to do. If you tie the justification for diversity to data, then what happens should the data change? If a new study showed that diverse companies were less profitable, is that a reason to abandon diversity? Absolutely not! If your justification isn’t tied to numbers, then it hardly matters what the numbers say (though it does admitedly feel good to have your stance backed up).

By the way, this is also why I don’t think it’s a good idea to “sell” design systems on the basis of efficiency and cost-savings if the real reason you’re building one is to foster better collaboration and creativity. The fundamental purpose of a design system needs to be shared, not swapped out based on who’s doing the talking.

Anyway, back to accessibility…

A marketplace, to me, feels like exactly the wrong kind of place for accessibility to defend its existence. By its nature, accessibility isn’t a mainstream issue. I mean, think about it: it’s good that accessibility issues affect a minority of people. The fewer, the better. But even if the number of people affected by accessibility were to trend downwards and dwindle, the importance of accessibility should remain unchanged. Accessibility is important regardless of the numbers.

Look, if I make a website for a client, I don’t offer accessibility as a line item with a price tag attached. I build in accessibility by default because it’s the right thing to do. The only way to ensure that accessibility doesn’t get negotiated away is to make sure it’s not up for negotiation.

So that’s why I feel uncomfortable seeing accessibility features in a popularity contest.

I think that markets are great. I think competition is great. But I don’t think it works for everything (like, could you imagine applying marketplace economics to healthcare or prisons? Nightmare!). I concur with Iain M. Banks:

The market is a good example of evolution in action; the try-everything-and-see-what- -works approach. This might provide a perfectly morally satisfactory resource-management system so long as there was absolutely no question of any sentient creature ever being treated purely as one of those resources.

If Igalia or Mozilla or Google or Apple implement an accessibility feature because they believe that accessibility is important and deserves prioritisation, that’s good. If they implement the same feature just because it received a lot of votes …that doesn’t strike me as a good thing.

I guess it doesn’t matter what the reason is as long as the end result is the same, right? But I suspect that what we’ll see is that the accessibility features up for bidding on Open Prioritization won’t be the winners.