Journal

2744 sparkline

Thursday, January 21st, 2021

Letters of exclusion

I think my co-workers are getting annoyed with me. Any time they use an acronym or initialism—either in a video call or Slack—I ask them what it stands for. I’m sure they think I’m being contrarian.

The truth is that most of the time I genuinely don’t know what the letters stand for. And I’ve got to that age where I don’t feel any inhibition about asking “stupid” questions.

But it’s also true that I really, really dislike acronyms, initialisms, and other kinds of jargon. They’re manifestations of gatekeeping. They demarcate in-groups from outsiders.

Of course if you’re in a conversation with an in-group that has the same background and context as you, then sure, you can use acronyms and initialisms with the confidence that there’s a shared understanding. But how often can you be that sure? The more likely situation—and this scales exponentially with group size—is that people have differing levels of inside knowledge and experience.

I feel sorry for anyone trying to get into the field of web performance. Not only are there complex browser behaviours to understand, there’s also a veritable alphabet soup of initialisms to memorise. Here’s a really good post on web performance by Harry, but notice how the initialisms multiply like tribbles as the post progresses until we’re talking about using CWV metrics like LCP, FID, and CLS—alongside TTFB and SI—to look at PLPs, PDPs, and SRPs. And fair play to Harry; he expands each initialism the first time he introduces it.

But are we really saving any time by saying FID instead of first input delay? I suspect that the only reason why the word “cumulative” precedes “layout shift” is just to make it into the three-letter initialism CLS.

Still, I get why initialisms run rampant in technical discussions. You can be sure that most discussions of particle physics would be incomprehensible to outsiders, not necessarily because of the concepts, but because of the terminology.

Again, if you’re certain that you’re speaking to peers, that’s fine. But if you’re trying to communicate even a little more widely, then initialisms and abbreviations are obstacles to overcome. And once you’re in the habit of using the short forms, it gets harder and harder to apply context-shifting in your language. So the safest habit to form is to generally avoid using acronyms and initialisms.

Unnecessary initialisms are exclusionary.

Think about on-boarding someone new to your organisation. They’ve already got a lot to wrap their heads around without making them figure out what a TAM is. That’s a real example from Clearleft. We have a regular Thursday afternoon meeting. I call it the Thursday afternoon meeting. Other people …don’t.

I’m trying—as gently as possible—to ensure we’re not being exclusionary in our language. My co-workers indulge me, even it’s just to shut me up.

But here’s the thing. I remember many years back when a job ad went out on the Clearleft website that included the phrase “culture fit”. I winced and explained why I thought that was a really bad phrase to use—one that is used as code for “more people like us”. At the time my concerns were met with eye-rolls and chuckles. Now, as knowledge about diversity and inclusion has become more widespread, everyone understands that using a phrase like “culture fit” can be exclusionary.

But when I ask people to expand their acronyms and initialisms today, I get the same kind of chuckles. My aversion to abbreviations is an eccentric foible to be tolerated.

But this isn’t about me.

Wednesday, January 20th, 2021

Get safe

The verbs of the web are GET and POST. In theory there’s also PUT, DELETE, and PATCH but in practice POST often does those jobs.

I’m always surprised when front-end developers don’t think about these verbs (or request methods, to use the technical term). Knowing when to use GET and when to use POST is crucial to having a solid foundation for whatever you’re building on the web.

Luckily it’s not hard to know when to use each one. If the user is requesting something, use GET. If the user is changing something, use POST.

That’s why links are GET requests by default. A link “gets” a resource and delivers it to the user.

<a href="/items/id">

Most forms use the POST method becuase they’re changing something—creating, editing, deleting, updating.

<form method="post" action="/items/id/edit">

But not all forms should use POST. A search form should use GET.

<form method="get" action="/search">
<input type="search" name="term">

When a user performs a search, they’re still requesting a resource (a page of search results). It’s just that they need to provide some specific details for the GET request. Those details get translated into a query string appended to the URL specified in the action attribute.

/search?term=value

I sometimes see the GET method used incorrectly:

  • “Log out” links that should be forms with a “log out” button—you can always style it to look like a link if you want.
  • “Unsubscribe” links in emails that immediately trigger the action of unsubscribing instead of going to a form where the POST method does the unsubscribing. I realise that this turns unsubscribing into a two-step process, which is a bit annoying from a usability point of view, but a destructive action should never be baked into a GET request.

When the it was first created, the World Wide Web was stateless by design. If you requested one web page, and then subsequently requested another web page, the server had no way of knowing that the same user was making both requests. After serving up a page in response to a GET request, the server promptly forgot all about it.

That’s how web browsing should still work. In fact, it’s one of the Web Platform Design Principles: It should be safe to visit a web page:

The Web is named for its hyperlinked structure. In order for the web to remain vibrant, users need to be able to expect that merely visiting any given link won’t have implications for the security of their computer, or for any essential aspects of their privacy.

The expectation of safe stateless browsing has been eroded over time. Every time you click on a search result in Google, or you tap on a recommended video in YouTube, or—heaven help us—you actually click on an advertisement, you just know that you’re adding to a dossier of your online profile. That’s not how the web is supposed to work.

Don’t get me wrong: building a profile of someone based on their actions isn’t inherently wrong. If a user taps on “like” or “favourite” or “bookmark”, they are actively telling the server to perform an update (and so those actions should be POST requests). But do you see the difference in where the power lies? With POST actions—fave, rate, save—the user is in charge. With GET requests, no one is supposed to be in charge—it’s meant to be a neutral transaction. Alas, the reality of today’s web is that many GET requests give more power to the dossier-building servers at the expense of the user’s agency.

The very first of the Web Platform Design Principles is Put user needs first :

If a trade-off needs to be made, always put user needs above all.

The current abuse of GET requests is damage that the web needs to route around.

Browsers are helping to a certain extent. Most browsers have the concept of private browsing, allowing you some level of statelessness, or at least time-limited statefulness. But it’s kind of messed up that private browsing is the exception, while surveillance is the default. It should be the other way around.

Firefox and Safari are taking steps to reduce tracking and fingerprinting. Rejecting third-party coookies by default is a good move. I’d love it if third-party JavaScript were also rejected by default:

In retrospect, it seems unbelievable that third-party JavaScript is even possible. I mean, putting arbitrary code—that can then inject even more arbitrary code—onto your website? That seems like a security nightmare!

I imagine if JavaScript were being specced today, it would almost certainly be restricted to the same origin by default.

Chrome has different priorities, which is understandable given that it comes from a company with a business model that is currently tied to tracking and surveillance (though it needn’t remain that way). With anti-trust proceedings rumbling in the background, there’s talk of breaking up Google to avoid monopolistic abuses of power. I honestly think it would be the best thing that could happen to Chrome if it were an independent browser that could fully focus on user needs without having to consider the surveillance needs of an advertising broker.

But we needn’t wait for the browsers to make the web a safer place for users.

Developers write the code that updates those dossiers. Developers add those oh-so-harmless-looking third-party scripts to page templates.

What if we refused?

Front-end developers in particular should be the last line of defence for users. The entire field of front-end devlopment is supposed to be predicated on the prioritisation of user needs.

And if the moral argument isn’t enough, perhaps the technical argument can get through. Tracking users based on their GET requests violates the very bedrock of the web’s architecture. Stop doing that.

Sunday, January 10th, 2021

My typical day

Colin wrote about his typical day and suggested I do the same.

Y’know, in the Before Times I think this would’ve been trickier. What with travelling and speaking, I didn’t really have a “typical” day …and I liked it that way. Now, thanks to The Situation, my days are all pretty similar.

  • 8:30am — This is the time I’ve set my alarm for, but sometimes I wake up a bit earlier. I get up, fire up the coffee machine, go to the head and empty my bladder. Maybe I’ll have a shower.
  • 9am — I fire up email and Slack, wishing my co-workers a good morning. Over the course of each day, I’ve usually got short 1:1s booked in with two or three of my colleagues. Just fifteen minutes or so to catch up and find out what they’re working on, what’s interesting, what’s frustrating. The rest of the time, I’ll probably be working on the Clearleft podcast.
  • 1pm — Lunch time. Jessica takes her lunch break at the same time. We’ll usually have a toasted sandwich or a bowl of noodles. While we eat, Jessica will quiz me with the Learned League questions she’s already answered that morning. I get all the fun of testing my knowledge without the pressure of competing.
  • 2pm — If the weather’s okay, we might head out for a brisk walk, probably to the nearby park where we can watch good doggos. Otherwise, it’s back to the podcast mines. I’ve already amassed a fair amount of raw material from interviews, so I’m spending most of my time in Descript, crafting and editing each episode. In about three hours of work, I reckon I get four or five minutes of good audio together. I should really be working on my upcoming talk for An Event Apart too, but I’m procrastinating. But I’m procrastinating by doing the podcast, so I’ve kind of tricked myself into doing something I’m supposed to be doing by avoiding something else I’m supposed to be doing.
  • Sometime between 5pm and 6pm — I knock off work. I pick up my mandolin and play some tunes. If Jessica’s done with work too, we play some tunes together.
  • 7pm — If it’s a Tuesday or Thursday, then it’s a ballet night for Jessica. While she’s in the kitchen doing her class online, I chill out in the living room, enjoying a cold beer, listening to some music with headphones on, and doing some reading or writing. I might fire up NetNewsWire and read the latest RSS updates from my friends, or I might write a blog post.
  • 8pm — If it is a ballet night, then dinner will be something quick and easy to prepare; probably pasta. Otherwise there’s more time to prepare something with care and love. Jessica is the culinary genius so my contributions are mostly just making sure she’s got her mise en place ahead of time, and cleaning up afterwards. I choose a bottle of wine and set the table, and then we sit down to eat together. It is definitely the highlight of the day.
  • 9pm — After cleaning up, I make us both cups of tea and we settle in on the sofa to watch some television. Not broadcast television; something on the Apple TV from Netflix, Amazon Prime, Disney+, or BBC iPlayer most likely. If we’re in the right mood, we’ll watch a film.
  • Sometime between 11pm and midnight — I change into my PJs, brush and floss my teeth, and climb into bed with a good book. When I feel my eyelids getting heavy, I switch off the light and go to sleep. That’s where I’m a Viking!

That’s a typical work day. My work week is Monday to Thursday. I switched over to a four-day week when The Situation hit, and now I don’t ever want to go back. It means making less money, but it’s worth it for a three day weekend.

My typical weekend involves more mandolin playing, more reading, more movies, and even better meals. I’ll also do some chores: clean the floors; back up my data.

Monday, January 4th, 2021

Speaking online

I really, really missed speaking at conferences in 2020. I managed to squeeze in just one meatspace presentation before everything shut down. That was in Nottingham, where myself and Remy reprised our double-bill talk, How We Built The World Wide Web In Five Days.

That was pretty much all the travelling I did in 2020, apart from a joyous jaunt to Galway to celebrate my birthday shortly before the Nottingham trip. It’s kind of hilarious to look at a map of the entirety of my travel in 2020 compared to previous years.

Mind you, one of my goals for 2020 was to reduce my carbon footprint. Mission well and truly accomplished there.

But even when travel was out of the question, conference speaking wasn’t entirely off the table. I gave a brand new talk at An Event Apart Online Together: Front-End Focus in August. It was called Design Principles For The Web and I’ve just published a transcript of the presentation. I’m really pleased with how it turned out and I think it works okay as an article as well as a talk. Have a read and see what you think (or you can listen to the audio if you prefer).

Giving a talk online is …weird. It’s very different from public speaking. The public is theoretically there but you feel like you’re just talking at your computer screen. If anything, it’s more like recording a podcast than giving a talk.

Luckily for me, I like recording podcasts. So I’m going to be doing a new online talk this year. It will be at An Event Apart’s Spring Summit which runs from April 19th to 21st. Tickets are available now.

I have a pretty good idea what I’m going to talk about. Web stuff, obviously, but maybe a big picture overview this time: the past, present, and future of the web.

Time to prepare a conference talk.

Friday, January 1st, 2021

2020

In 2020, I didn’t have the honour and privilege of speaking at An Event Apart in places like Seattle, Boston, and Minneapolis. I didn’t experience that rush that comes from sharing ideas with a roomful of people, getting them excited, making them laugh, sparking thoughts. I didn’t enjoy the wonderful and stimulating conversations with my peers that happen in the corridors, or over lunch, or at an after-party. I didn’t have a blast catching up with old friends or making new ones.

But the States wasn’t the only country I didn’t travel to. Closer to home, I didn’t have the opportunity to take the Eurostar and connecting trains to cities like Cologne, Lisbon, and Stockholm. I didn’t sample the food and drink of different countries.

In the summer, I didn’t travel to the west coast of Ireland for the second in year in a row for the annual Willie Clancy festival of traditional Irish music. I didn’t spend each day completely surrounded by music. I didn’t play in some great sessions. I didn’t hear some fantastic and inspiring musicians.

Back here in Brighton, I didn’t go to the session in The Jolly Brewer every Wednesday evening and get lost in the tunes. I didn’t experience that wonderful feeling of making music together and having a pint or two. And every second Sunday afternoon, I didn’t pop along to The Bugle for more jigs and reels.

I didn’t walk into work most days, arrive at the Clearleft studio, and make a nice cup of coffee while chit-chatting with my co-workers. I didn’t get pulled into fascinating conversations about design and development that spontaneously bubble up when you’re in the same space as talented folks.

Every few months, I didn’t get a haircut.

Throughout the year, I didn’t make any weekend trips back to Ireland to visit my mother.

2020 gave me a lot of free time. I used that time to not write a book. And with all that extra time on my hands, I read fewer books than I had read in 2019. Oh, and on the side, I didn’t learn a new programming language. I didn’t discover an enthusiasm for exercise. I didn’t get out of the house and go for a brisk walk on most days. I didn’t start each day prepping my sourdough.

But I did stay at home, thereby slowing the spread of a deadly infectious disease. I’m proud of that.

I did play mandolin. I did talk to my co-workers through a screen. I did eat very well—and very local and seasonal. I did watch lots of television programmes and films. I got by. Sometimes I even took pleasure in this newly-enforced lifestyle.

I made it through 2020. And so did you. That’s an achievement worth celebrating—congratulations!

Let’s see what 2021 doesn’t bring.

Thursday, December 31st, 2020

2020 in numbers

I posted to adactio.com 1442 times in 2020. sparkline

March was the busiest month with 184 posts. sparkline

This month, December, was the quietest with 68 posts. sparkline

Overall I published:

In amongst those notes are 128 photos. But the number I’m happiest with is 200. From to March 18th to October 3rd, I posted a tune a day for 200 days straight.

Elsewhere in 2020:

For obvious reasons, in 2020 I had far fewer check ins, did far less speaking and almost no travel.

Books I read in 2020

I only read twenty books this year. Considering the ample amount of free time I had, that’s not great. But I’m not going to beat myself up about it. Yes, I may have spent more time watching television than reading, but I’m cutting myself some slack. It was 2020, for crying out loud.

Anyway, here’s my annual round-up with reviews. Anything with three stars is good. Four stars is really good. Five stars is practically unheard of. As usual, I tried to get an equal balance of fiction and non-fiction.

Raven Stratagem by Yoon Ha Lee

★★★☆☆

An enjoyable sequal to Ninefox Gambit. There are some convoluted politics but that all seems positively straightforward after the brain-bending calendrical warfare introduced in the first book.

The Human Use Of Human Beings: Cybernetics And Society by Norbert Wiener

★★★☆☆

The ur-text on systems and feedback. Reading it now is like reading a historical artifact but many of the ideas are timeless. It’s a bit dense in parts and it tries to cover life, the universe and everything, but when you remember that it was written in 1950, it’s clearly visionary.

The Word For World Is Forest by Ursula K. Le Guin

★★★☆☆

Simultaneously a ripping yarn and a spiritual meditation. It’s Vietnam and the environmental movement rolled into one (like what Avatar attempted, but this actually works).

Abolish Silicon Valley by Wendy Liu

★★★★☆

Here’s my full review.

A Short History Of Irish Traditional Music by Gearóid Ó hAllmhuráin

★★☆☆☆

A perfectly fine and accurate history of the music, but it’s a bit like reading Wikipedia. Still, it was quite the ego boost to see The Session listed in the appendix.

Machines Like Me by Ian McEwan

★★★☆☆

McEwan’s first foray into science fiction is a good tale but a little clumsily told. It’s like he really wants to show how much research he put into his alternative history. There are moments when characters practically turn to the camera to say, “Imagine how the world would’ve turned out if…” It’s far from McEwan’s best but even when he’s not on top form, his writing is damn good.

The Fabric Of Reality by David Deutsch

★★★☆☆

I’ve attempted to read this before. I may have even read it all before and had everything just leak out of my head. The problem is with me, not David Deutsch who does a fine job of making complex ideas approachable. This is like a unified theory of everything.

Helliconia Winter by Brian Aldiss

★★★☆☆

The third and final part of Aldiss’s epic is just as enjoyable as the previous two. The characters aren’t the main attraction here. It’s all about the planetary ballet.

Uncanny Valley by Anna Wiener

★★★★☆

A terrific memoir. It’s open and honest, and just snarky enough when it needs to be.

A Wizard Of Earthsea, The Tombs Of Atuan, and The Farthest Shore by Ursula K. Le Guin

★★★★☆

There’s a real pleasure in finally reading books that you should’ve read years ago. I can only imagine how wonderful it would’ve been to read these as a teenager. It’s an immersive world but there’s something melancholy about the writing that makes the experience of reading less escapist and more haunting.

Superior: The Return of Race Science by Angela Saini

★★★★★

Absolutely superb! I liked Angela Saini’s previous book, Inferior, but I loved this. It’s a harrowing read at times, but written with incredible clarity and empathy. I can’t recommend this highly enough.

Purple People by Kate Bulpitt

★★★★☆

Full disclosure: Kate is a friend of mine, so I probably can’t evaluate her book in a disinterested way. That said, I enjoyed the heck out of this and I think you will too. It’s very hard to classify and I think that’s what makes it so enjoyable. Technically, it’s sci-fi I suppose—an alternative history tale, probably—but it doesn’t feel like it. It’s all about the characters, and they’re all vividly realised. Honestly, I’m not sure how best to describe it—other then it being like the inside of Kate’s head—but the description of it being “a jolly dystopia” comes close. Take a chance and give it a go.

How to Argue With a Racist: History, Science, Race and Reality by Adam Rutherford

★★★☆☆

Good stuff from Adam Rutherford, though not his best. If I hadn’t already read Angela Saini’s Superior I might’ve rated this higher, but it pales somewhat by comparison. Still, it was interesting to see the same subject matter tackled in two different ways.

Agency by William Gibson

★★☆☆☆

There’s nothing particularly wrong with Agency, but there’s nothing particularly great about it either. It’s just there. Maybe I’m being overly harsh because the first book, The Peripheral, was absolutely brilliant. This reminded me of reading Gibson’s Spook Country, which left me equally unimpressed. That book was sandwiched between the brilliant Pattern Recognition and the equally brilliant Zero History. That bodes well for the forthcoming third book in this series. This second book just feels like filler.

Last Night’s Fun: In And Out Of Time With Irish Music by Ciaran Carson

★★★☆☆

It’s hard to describe this book. Memoir? Meditation? Blog? I kind of like that about it, but I can see how it divides opinion. Some people love it. Some people hate it. I thought it was enjoyable enough. But it doesn’t matter what I think. This book is doing its own thing.

Revenant Gun by Yoon Ha Lee

★★★☆☆

The third book in the Machineries of Empire series has much less befuddlement. It’s even downright humourous in places. If you liked Ninefox Gambit and Raven Strategem, you’ll enjoy this too.

A Paradise Built in Hell: The Extraordinary Communities That Arise in Disaster by Rebecca Solnit

★★★☆☆

The central thesis of this book is refuting the Hobbesian view of humanity as being one crisis away from breakdown. I feel like that argument was made more strongly in Critical Mass: How One Thing Leads to Another by Philip Ball. But where this book shines is in its vivid description of past catastrophes and their aftermaths: the San Francisco fire; the Halifax explosion; the Mexico City earthquake; and the culmination with Katrina hitting New Orleans. I was less keen on the more blog-like personal musings but overall, this is well worth reading.

Blindsight by Peter Watts

★★☆☆☆

I like a good tale of first contact, and I had heard that this one had a good twist on the Fermi paradox. But it felt a bit like a short story stretched to the length of a novel. It would make for a good Twilight Zone episode but it didn’t sustain my interest.

This is How You Lose the Time War by Amal El-Mohtar and Max Gladstone

I’m still reading this Hugo-winning novella and enjoying it so far.


Alright, time to wrap up this look back at the books I read in 2020 and pick my favourites: one fiction and one non-fiction.

My favourite non-fiction book of the year was easily Superior by Angela Saini. Read it. It’s superb.

What about fiction? Hmm …this is tricky.

You know what? I’m going to go for Purple People by Kate Bulpitt. Yes, she’s a friend (“it’s a fix!”) but it genuinely made an impression on me: it was an enjoyable romp while I was reading it, and it stayed with me afterwards too.

Head on over to Bookshop and pick up a copy.

Words I wrote in 2020

Once again I wrote over a hundred blog posts this year. While lots of other activities dropped off significantly while my main focus was to just keep on keepin’ on, I still found solace and reward in writing and publishing. Like I said early on in The Situation, my website is an outlet for me:

While you’re stuck inside, your website is not just a place you can go to, it’s a place you can control, a place you can maintain, a place you can tidy up, a place you can expand. Most of all, it’s a place you can lose yourself in, even if it’s just for a little while.

Here are some blog posts that turned out alright:

  • Architects, gardeners, and design systems. Citing Frank Chimero, Debbie Chachra, and Lisa O’Neill.
  • Hydration. Progressive enhancement. I do not think it means what you think it means.
  • Living Through The Future. William Gibson, Arthur C.Clarke, Daniel Dafoe, Stephen King, Emily St. John Mandel, John Wyndham, Martin Cruz-Smith, Marina Koren and H.G. Wells.
  • Principles and priorities. Using design principles to embody your priorities.
  • Hard to break. Brittleness is the opposite of resilience. But they both share something in common.
  • Intent. Black lives matter.
  • Accessibility. Making the moral argument.
  • T E N Ǝ T. A spoiler-filled look at the new Christopher Nolan film.
  • Portals and giant carousels. Trying to understand why people think they need to make single page apps.
  • Clean advertising. The greatest trick the devil ever pulled was convincing the world that behavioural advertising is more effective than contextual advertising.

I find it strangely comforting that even in a year as shitty as 2020, I can look back and see that there were some decent blog posts in there. Whatever 2021 may bring, I hope to keep writing and publishing through it all. I hope you will too.

Tuesday, December 22nd, 2020

SVGs in dark mode

I added a dark mode to my site last year. Since then I’ve been idly toying with the addition of a dark mode to The Session too.

As with this site, the key to adding a dark mode was switching to custom properties for color and background-color declarations. But my plans kept getting derailed by the sheet music on the site. The sheet music is delivered as SVG generated by ABCJS which hard-codes the colour in stroke and fill attributes:

fill="#000000" stroke="#000000"

When I was describing CSS recently I mentioned the high specifity of inline styles:

Whereas external CSS and embedded CSS don’t have any effect on specificity, inline styles are positively radioactive with specificity.

Given that harsh fact of life, I figured it would be nigh-on impossible to over-ride the colour of the sheetmusic. But then I realised I was an idiot.

The stroke and fill attributes in SVG are presentational but they aren’t inline styles. They’re attributes. They have no affect on specifity. I can easily over-ride them in an external style sheet.

In fact, if I had actually remembered what I wrote when I was adding a dark mode to adactio.com, I could’ve saved myself some time:

I have SVGs of sparklines on my homepage. The SVG has a hard-coded colour value in the stroke attribute of the path element that draws the sparkline. Fortunately, this can be over-ridden in the style sheet:

svg.activity-sparkline path {
  stroke: var(--text-color);
}

I was able to do something similar on The Session. I used the handy currentColor keyword in CSS so that the sheet music matched the colour of the text:

svg path {
  fill: currentColor;
}
svg path:not(stroke="none") {
  stroke: currentColor;
}

Et voila! I now had light-on-dark sheet music for The Session’s dark mode all wrapped up in a prefers-color-scheme: dark media query.

I pushed out out the new feature and started getting feedback. It could be best summarised as “Thanks. I hate it.”

It turns out that while people were perfectly fine with a dark mode that inverts the colours of text, it felt really weird and icky to do the same with sheet music.

On the one hand, this seems odd. After all, sheet music is a writing system like any other. If you’re fine with light text on a dark background, why doesn’t that hold for light sheet music on a dark background?

But on the other hand, sheet music is also like an image. And we don’t invert the colours of our images when we add a dark mode to our CSS.

With that in mind, I went back to the drawing board and this time treated the sheet music SVGs as being intrinsicly dark-on-light, rather than a stylistic choice. It meant a few more CSS rules, but I’m happy with the final result. You can see it in action by visiting a tune page and toggling your device’s “appearance” settings between light and dark.

If you’re a member of The Session, I also added a toggle switch to your member profile so you can choose dark or light mode regardless of your device settings.

Monday, December 21st, 2020

Web Audio API weirdness on iOS

I told you about how I’m using the Web Audio API on The Session to generate synthesised audio of each tune setting. I also said:

Except for some weirdness on iOS that I had to fix.

Here’s that weirdness…

Let me start by saying that this isn’t anything to do with requiring a user interaction (the Web Audio API insists on some kind of user interaction to prevent developers from having auto-playing sound on websites). All of my code related to the Web Audio API is inside a click event handler. This is a different kind of weirdness.

First of all, I noticed that if you pressed play on the audio player when your iOS device is on mute, then you don’t hear any audio. Seems logical, right? Except if using the same device, still set to mute, you press play on a video or audio element, the sound plays just fine. You can confirm this by going to Huffduffer and pressing play on any of the audio elements there, even when your iOS device is set on mute.

So it seems that iOS has different criteria for the Web Audio API than it does for audio or video. Except it isn’t quite that straightforward.

On some pages of The Session, as well as the audio player for tunes (using the Web Audio API) there are also embedded YouTube videos (using the video element). Press play on the audio player; no sound. Press play on the YouTube video; you get sound. Now go back to the audio player and suddenly you do get sound!

It’s almost like playing a video or audio element “kicks” the browser into realising it should be playing the sound from the Web Audio API too.

This was happening on iOS devices set to mute, but I was also getting reports of it happening on devices with the sound on. But it’s that annoyingly intermittent kind of bug that’s really hard to reproduce consistently. Sometimes the sound doesn’t play. Sometimes it does.

Following my theory that the browser needs a “kick” to get into the right frame of mind for the Web Audio API, I resorted to a messy little hack.

In the event handler for the audio player, I generate the “kick” by playing a second of silence using the JavaScript equivalent of the audio element:

var audio = new Audio('1-second-of-silence.mp3');
audio.play();

I’m not proud of that. It’s so hacky that I’ve even wrapped the code in some user-agent sniffing on the server, and I never do user-agent sniffing!

Still, if you ever find yourself getting weird but inconsistent behaviour on iOS using the Web Audio API, this nasty little hack could help.