Tags: olo



Sunday, October 6th, 2019

Dark mode

I had a very productive time at Indie Web Camp Amsterdam. The format really lends itself to getting the most of a weekend—one day of discussions followed by one day of hands-on making and doing. You should definitely come along to Indie Web Camp Brighton on October 19th and 20th to experience it for yourself.

By the end of the “doing” day, I had something fun to demo—a dark mode for my website.

Y’know, when I first heard about Apple adding dark mode to their OS—and also to CSS—I thought, “Oh, great, Apple are making shit up again!” But then I realised that, like user style sheets, this is one more reminder to designers and developers that they don’t get the last word—users do.

Applying the dark mode styles is pretty straightforward in theory. You put the styles inside this media query:

@media (prefers-color-scheme: dark) {

Rather than over-riding every instance of a colour in my style sheet, I decided I’d do a little bit of refactoring first and switch to using CSS custom properties (or variables, if you will).

:root {
  --background-color: #fff;
  --text-color: #333;
  --link-color: #b52;
body {
  background-color: var(--background-color);
  color: var(--text-color);
a {
  color: var(--link-color);

Then I can over-ride the custom properties without having to touch the already-declared styles:

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #111416
    --text-color: #ccc;
    --link-color: #f96;

All in all, I have about a dozen custom properties for colours—variations for text, backgrounds, and interface elements like links and buttons.

By using custom properties and the prefers-color-scheme media query, I was 90% of the way there. But the devil is in the details.

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);

The real challenge came with the images I use in the headers of my pages. They’re JPEGs with white corners on one side and white gradients on the other.

header images

I could make them PNGs to get transparency, but the file size would shoot up—they’re photographic images (with a little bit of scan-line treatment) so JPEGs (or WEBPs) are the better format. Then I realised I could use CSS to recreate the two effects:

  1. For the cut-out triangle in the top corner, there’s clip-path.
  2. For the gradient, there’s …gradients!
background-image: linear-gradient(
  to right,
  transparent 50%,
  var(—background-color) 100%

Oh, and I noticed that when I applied the clip-path for the corners, it had no effect in Safari. It turns out that after half a decade of support, it still only exists with -webkit prefix. That’s just ridiculous. At this point we should be burning vendor prefixes with fire. I can’t believe that Apple still ships standardised CSS properties that only work with a prefix.

In order to apply the CSS clip-path and gradient, I needed to save out the images again, this time without the effects baked in. I found the original Photoshop file I used to export the images. But I don’t have a copy of Photoshop any more. I haven’t had a copy of Photoshop since Adobe switched to their Mafia model of pricing. A quick bit of searching turned up Photopea, which is pretty much an entire recreation of Photoshop in the browser. I was able to open my old PSD file and re-export my images.

LEGO clone trooper Brighton bandstand Scaffolding Tokyo Florence

Let’s just take a moment here to pause and reflect on the fact that we can now use CSS to create all sorts of effects that previously required a graphic design tool like Photoshop. I could probably do those raster scan lines with CSS if I were smart enough.

dark mode

This is what I demo’d at the end of Indie Web Camp Amsterdam, and I was pleased with the results. But fate had an extra bit of good timing in store for me.

The very next day at the View Source conference, Melanie Richards gave a fantastic talk called The Tailored Web: Effectively Honoring Visual Preferences (seriously, conference organisers, you want this talk on your line-up). It was packed with great insights and advice on impementing dark mode, like this little gem for adjusting images:

@media (prefers-color-scheme: dark) {
  img {
    filter: brightness(.8) contrast(1.2);

Melanie also pointed out that you can indicate the presence of dark mode styles to browsers, although the mechanism is yet to shake out. You can do it in CSS:

:root {
  color-scheme: light dark;

But you can also do it in HTML:

<meta name="supported-color-schemes" content="light dark">

That allows browsers to swap out replaced content; interface elements like form fields and dropdowns.

Oh, and one other addition I added after the fact was swapping out map imagery by using the picture element to point to darker map tiles:

<source media="prefers-color-scheme: dark" srcset="https://api.mapbox.com/styles/v1/mapbox/dark-v10/static...">
<img src="https://api.mapbox.com/styles/v1/mapbox/outdoors-v10/static..." alt="map">

light map dark map

So now I’ve got a dark mode for my website. Admittedly, it’s for just one of the eight style sheets. I’ve decided that, while I’ll update my default styles at every opportunity, I’m going to preservethe other skins as they are, like the historical museum pieces they are.

If you’re on the latest version of iOS, go ahead and toggle the light and dark options in your system preferences to flip between this site’s colour schemes.

Saturday, September 28th, 2019

Frank Chimero · A Like Can’t Go Anywhere, But a Compliment Can Go a Long Way

A thousand likes doesn’t look much bigger than one, and this becomes important when considering the form of negativity on social media.

There is no feature for displeasure on social media, so if a person wants to express that, they must write. Complaints get wrapped in language, and language is always specific.

Friday, September 27th, 2019

The Octopus: An Alien Among Us | Literary Hub

An excerpt from the book Rethinking Consciousness by Michael S. A. Graziano, which looks like an interesting companion piece to Peter Godfrey-Smith’s excellent Other Minds.

Also, can I just say how nice this reading experience is—the typography, the arresting image …I like it.

Saturday, September 21st, 2019

Thinking vs Choosing – The Haystack

There seems to be a tendency to repurpose existing solutions to other people’s problems. I propose that this is the main cause of the design sameness that we encounter on the web (and in apps) today. In our (un)conscious attempts to reduce the effort needed to do our work, we’ve become experts in choosing rather than in thinking.

A very thoughtful piece from Stephen.

When we use existing solutions or patterns, we use a different kind of thinking. Our focus is on finding which pattern will work for us. Too quickly, we turn our attention away from closely examining the problem.

Wednesday, September 18th, 2019

Keeping it simple with CSS that scales - Andy Bell

The transcript of Andy’s talk from this year’s State Of The Browser conference.

I don’t think using scale as an excuse for over-engineering stuff—especially CSS—is acceptable, even for huge teams that work on huge products.

The Appification of Everything & Why it Needs to End

When your only tool seems like a smartphone, everything looks like an app.

Amber writes on Ev’s blog about products that deliberately choose to be dependent on smartphone connectivity:

We read service outage stories like these seemingly every week, and have become numb to the fundamental reality: The idea of placing the safety of yourself, your child, or another loved one in the hands of an app dependent on a server you cannot touch, control, or know the status of, is utterly unacceptable.

Monday, August 26th, 2019

Online Color Picker From Image - Pick your color

A nice standalone tool for picking colours out of photos, and generating a colour palette from the same photo.

Friday, August 23rd, 2019

The Arrogance of the Anthropocene - The Atlantic

If, in the final 7,000 years of their reign, dinosaurs became hyperintelligent, built a civilization, started asteroid mining, and did so for centuries before forgetting to carry the one on an orbital calculation, thereby sending that famous valedictory six-mile space rock hurtling senselessly toward the Earth themselves—it would be virtually impossible to tell.

A nice steaming cup of perspective.

If there were a nuclear holocaust in the Triassic, among warring prosauropods, we wouldn’t know about it.

Thursday, August 8th, 2019


I recently wrote about a web-specific example of a general principle for choosing the right tool for the job:

JavaScript should only do what only JavaScript can do.

I was—yet again—talking about appropriateness. Use the right technology for the task at hand. Here’s the example I gave:

It feels “wrong” when a powerful client-side JavaScript framework is applied to something that could be accomplished using HTML. Making a blog that’s a single page app is over-engineering.

Surprisingly, I got some pushback on this. Šime Vidas wrote:

Based on my experience, this is not necessarily the case.

Going from server-side rendering and progressive enhancement via JS to a single-page app powered by a JS framework was a enormous reduction in complexity for me (so the opposite of over-engineering).

(Emphasis mine.) He goes on to say:

My main concerns are ease of use & maintainability. If you get those things right, you’re good and it’s not over-engineering.

There’s no doubt that maintainability is a desirable goal. And ease of use for the developer is also important …but I think they pale in comparison to ease of use for the end user.

To be fair, the specific use-case I mentioned was making a blog. And a blog is a personal thing. You can do whatever the heck you like on your own website and don’t let anyone tell you otherwise.

So I probably chose a poor example to illustrate my point. I was thinking more about when you’re making websites for a living. You’re being paid money to make something available on the web. In that situation, I strongly believe that user needs should win out over developer convenience.

I wrote about this recently:

As a user-centred developer, my priority is doing what’s best for end users. That’s not to say I don’t value developer convenience. I do. But I prioritise user needs over developer needs. And in any case, those two needs don’t even come into conflict most of the time.

That’s why I responded to Šime, saying:

Your main concern should be user needs—not your own.

When I talk about over-engineering, I’m speaking from the perspective of end users, not developers.

Before considering your ease of use, and maintainability, consider users first.

In fairness to Šime, he’s being very open and honest about his priorities. I admire that. I’ve seen too many developers try to provide user experience justifications for decisions made for developer convenience. Once again I recommend Alex’s excellent article, The “Developer Experience” Bait-and-Switch:

The swap is executed by implying that by making things better for developers, users will eventually benefit equivalently. The unstated agreement is that developers share all of the same goals with the same intensity as end users and even managers. This is not true.

Now I worry I wasn’t specific enough when I talked about choosing appropriate technology:

Appropriateness is something I keep coming back to when it comes to evaluating web technologies. I don’t think there are good tools and bad tools; just tools that are appropriate or inapropriate for the task at hand.

I should have made it clear that I was talking about what is appropriate or inapropriate for users. I think I made the mistake of assuming that this was obvious, and didn’t need saying. I’ll try not to make that mistake again.

There’s a whole group of tools where this point isn’t even relevant—build tools, task runners, version control …anything that never directly touches the end user; use whatever works for you. But if you’re making decisions around HTML, ARIA, CSS, or JavaScript, then appropriateness for the end user should take precedence.

If you’re in that situation—you are being paid money to make websites, and you are making technology decisions—I urge you to remember Charlie’s words: it isn’t about you.

Sunday, August 4th, 2019

What Technology Is Most Likely to Become Obsolete During Your Lifetime?

Old technology seldom just goes away. Whiteboards and LED screens join chalk blackboards, but don’t eliminate them. Landline phones get scarce, but not phones. Film cameras become rarities, but not cameras. Typewriters disappear, but not typing. And the technologies that seem to be the most outclassed may come back as a the cult objects of aficionados—the vinyl record, for example. All this is to say that no one can tell us what will be obsolete in fifty years, but probably a lot less will be obsolete than we think.

Wednesday, July 31st, 2019

The Real Dark Web

Charlie’s thoughts on dev perception:

People speak about “the old guard” and “stupid backwards techniques”, forgetting that it’s real humans, with real constraints who are working on these solutions. Most of us are working in a “stupid backwards way” because that “backwardsness” WORKS. It is something that is proven and is clearly documented. We can implement it confident that it will not disappear from fashion within a couple of years.

Tuesday, July 30th, 2019

Thursday, July 25th, 2019

Design tools are holding us back

My main concern about this new generation of tools is that they require a specific toolchain in order to function. “If you just use this version of React and just use this styling library and configure things in exactly this way, your designers can play around with coded components.” It worries me that teams would end up choosing (and subsequently holding onto) specific tools not because they’re the best choices for our users but because the designers’ and developers’ workflow depends on a specific toolchain to work properly.


I like good design principles. I collect design principles—of varying quality—at principles.adactio.com. Ben Brignell also has a (much larger) collection at principles.design.

You can spot the less useful design principles after a while. They tend to be wishy-washy; more like empty aspirational exhortations than genuinely useful guidelines for alignment. I’ve written about what makes for good design principles before. Matthew Ström also asked—and answered—What makes a good design principle?

  • Good design principles are memorable.
  • Good design principles help you say no.
  • Good design principles aren’t truisms.
  • Good design principles are applicable.

I like those. They’re like design principles for design principles.

One set of design principles that I’ve included in my collection is from gov.uk: government design principles . I think they’re very well thought-through (although I’m always suspicious when I see a nice even number like 10 for the amount of items in the list). There’s a great line in design principle number two—Do less:

Government should only do what only government can do.

This wasn’t a theoretical issue. The multiple departmental websites that preceded gov.uk were notorious for having too much irrelevant content—content that was readily available elsewhere. It was downright wasteful to duplicate that content on a government site. It wasn’t appropriate.

Appropriateness is something I keep coming back to when it comes to evaluating web technologies. I don’t think there are good tools and bad tools; just tools that are appropriate or inapropriate for the task at hand. Whether it’s task runners or JavaScript frameworks, appropriateness feels like it should be the deciding factor.

I think that the design principle from GDS could be abstracted into a general technology principle:

Any particular technology should only do what only that particular technology can do.

Take JavaScript, for example. It feels “wrong” when a powerful client-side JavaScript framework is applied to something that could be accomplished using HTML. Making a blog that’s a single page app is over-engineering. It violates this principle:

JavaScript should only do what only JavaScript can do.

Need to manage state or immediately update the interface in response to user action? Only JavaScript can do that. But if you need to present the user with some static content, JavaScript can do that …but it’s not the only technology that can do that. HTML would be more appropriate.

I realise that this is basically a reformulation of one of my favourite design principles, the rule of least power:

Choose the least powerful language suitable for a given purpose.

Or, as Derek put it:

In the web front-end stack — HTML, CSS, JS, and ARIA — if you can solve a problem with a simpler solution lower in the stack, you should. It’s less fragile, more foolproof, and just works.

ARIA should only do what only ARIA can do.

JavaScript should only do what only JavaScript can do.

CSS should only do what only CSS can do.

HTML should only do what only HTML can do.

Sunday, July 21st, 2019

5 Keys to Accessible Web Typography | Better Web Type

Some excellent explanations for these five pieces of sensible typography advice:

  1. Set your base font size in relative units
  2. Check the colour of your type and only then its contrast
  3. Use highly legible fonts
  4. Shape your paragraphs well
  5. Correctly use the heading levels

Friday, July 19th, 2019

The Guardian digital design style guide

What a lovely way to walk through the design system underpinning the Guardian website.

Bonus points for using the term “tweak points”!

Thursday, July 18th, 2019

Ralph Lavelle: On resilience

Thoughts on frameworks, prompted by a re-reading of Resilient Web Design. I quite like the book being described as a “a bird’s-eye view of the whole web design circus.”

Monday, July 15th, 2019

NeXT Software and Peripherals catalog Fall 1989

Brian found this scanned copy of a NeXT manual on the Internet Archive. I feel a great fondness for this machine after our CERN project.

Saturday, July 6th, 2019

Chaos Design: Before the robots take our jobs, can we please get them to help us do some good work?

This is a great piece! It starts with a look back at some of the great minds of the nineteenth century: Herschel, Darwin, Babbage and Lovelace. Then it brings us, via JCR Licklider, to the present state of the web before looking ahead to what the future might bring.

So what will the life of an interface designer be like in the year 2120? or 2121 even? A nice round 300 years after Babbage first had the idea of calculations being executed by steam.

I think there are some missteps along the way (I certainly don’t think that inline styles—AKA CSS in JS—are necessarily a move forwards) but I love the idea of applying chaos engineering to web design:

Think of every characteristic of an interface you depend on to not ‘fail’ for your design to ‘work.’ Now imagine if these services were randomly ‘failing’ constantly during your design process. How might we design differently? How would our workflows and priorities change?

Wednesday, July 3rd, 2019

inessential: No Algorithms

My hypothesis: these algorithms — driven by the all-consuming need for engagement in order to sell ads — are part of what’s destroying western liberal democracy, and my app will not contribute to that.