Tuesday, June 14th, 2016

Amsterdam Brighton Amsterdam

I’m about to have a crazy few days that will see me bouncing between Brighton and Amsterdam.

It starts tomorrow. I’m flying to Amsterdam in the morning and speaking at this Icons event in the afternoon about digital preservation and long-term thinking.

Then, the next morning, I’ll be opening up the inaugural HTML Special which is a new addition the CSS Day conference. Each talk on Thursday will cover one HTML element. I am honoured to speaking about the A element. Here’s the talk description:

The world exploded into a whirling network of kinships, where everything pointed to everything else, everything explained everything else…

Enquire within upon everything.

I’ve been working all out to get this talk done and I finally wrapped it up today. Right now, I feel pretty happy with it, but I bet I’ll change that opinion in the next 48 hours. I’m pretty sure that this will be one of those talks that people will either love or hate, kind of like my 2008 dConstruct talk, The System Of The World.

After CSS Day, I’ll be heading back to Brighton on Saturday, June 18th to play a Salter Cane gig in The Greys pub. If you’re around, you should definitely come along—not only is it free, but there will be some excellent support courtesy of Jon London, and Lucas and King.

Then, the next morning, I’ll be speaking at DrupalCamp Brighton, opening up day two of the event. I won’t be able to stick around long afterwards though, because I need to skidaddle to the airport to go back to Amsterdam!

Google are having their Progressive Web App Dev Summit there on Monday on Tuesday. I’ll be moderating a panel on the second day, so I’ll need to pay close attention to all the talks. I’ll be grilling representatives from Google, Samsung, Opera, Microsoft, and Mozilla. Considering my recent rants about some very bad decisions on the part of Google’s Chrome team, it’s very brave of them to ask me to be there, much less moderate a panel in public.

You can still register for the event, by the way. Like the Salter Cane gig, it’s free. But if you can’t make it along, I’d still like to know what you think I should be asking the panelists about.

Got a burning question for browser/device makers? Write it down, post it somewhere on the web with a link back to this post, and then send me a web mention (there’s a form for you to paste in the URL at the bottom of this post).

Sunday, June 12th, 2016

Thank you, jQuery

I turned Huffduffer into a progressive web app recently. It was already running on HTTPS so I didn’t have much to do. One manifest file and one basic Service Worker did the trick.

Getting the 'add to home screen' prompt for on Android Chrome.

I also did a bit of spring cleaning, refactoring some CSS. The site dates to 2008 so there’s plenty in there that I would do very differently today. Still, considering the age of the code, I wasn’t cursing my past self too much.

After that, I decided to refactor the JavaScript too. There, I had a clear goal: could I remove the dependency on jQuery?

It turned out to be pretty straightforward. I was able to bring my total JavaScript file size down to 3K (gzipped). Pretty much everything I was doing in jQuery could be just as easily accomplished with DOM methods like addEventListener and querySelectorAll, and objects like XMLHttpRequest and classList.

Of course, the reason why half of those handy helpers exist is because of jQuery. Certainly in the case of querySelector and querySelectorAll, jQuery blazed a trail for browsers and standards bodies to pave. In some cases, like animation, the jQuery-led solutions ended up in CSS instead of JavaScript, but the story was the same: developers used the heck of jQuery and browser makers paid attention to that. This is something that Jack spoke about at Render Conf a little while back.

Brian once said of PhoneGap that its ultimate purpose is to cease to exist. I think of jQuery in a similar way.

jQuery turned ten years old this year, and jQuery version 3.0 was just released. Congratulations, jQuery! You have served the web well.

Saturday, June 11th, 2016

Progressive web app store

Remember when Chrome developers decided to remove the “add to home screen” prompt for progressive web apps that used display: browser in their manifest files? I wasn’t happy.

Alex wrote about their plans to offer URL access for all installed progressive web apps, regardless of what’s in the manifest file. I look forward to that. In the meantime, it makes no sense to punish the developers who want to give users access to URLs.

Alex has acknowledged the cart-before-horse-putting, and written a follow-up post called PWA Discovery: You Ain’t Seen Nothin Yet:

The browser’s goal is clear: create a hurdle tall enough that only sites that meet user expectations of “appyness” will be prompted for. Maybe Chrome’s version of this isn’t great! Feedback like Ada’s, Andrew’s, and Jeremy’s is helpful is letting us know how to improve. Thankfully, in most of the cases flagged so far, we’ve anticipated the concerns but maybe haven’t communicated our thinking as well as we should have. This is entirely my fault. This post is my penance.

It turns out that the home-screen prompt was just the first stab. There’s a really interesting idea Alex talks about called “ambient badging”:

Wouldn’t it be great if there were a button in the URL bar that appeared whenever you landed on a PWA that you could always tap to save it to your homescreen? A button that showed up in the top-level UI only when on a PWA? Something that didn’t require digging through menus and guessing about “is this thing going to work well when launched from the homescreen?”

I really, really like this idea. It kind of reminds me of when browsers would flag up whether or not a website had an RSS feed, and allow you to subscribe right then and there.

Hold that thought. Because if you remember the history of RSS, it ended up thriving and withering based on the fortunes of one single RSS reader.

Whenever the discoverability of progressive web apps comes up, the notion of an app store for the web is inevitably floated. Someone raised it as a question at one of the Google I/O panels: shouldn’t Google provide some kind of app store for progressive web apps? …to which Jake cheekily answered that yes, Google should create some kind of engine that would allow people to search for these web apps.

He’s got a point. Progressive web apps live on the web, so any existing discovery method on the web will work just fine. Remy came to a similar conclusion:

Progressive web apps allow users to truly “visit our URL to install our app”.

Also, I find it kind of odd that people think that it needs to be a company the size of Google that would need to build any kind of progressive web app store. It’s the web! Anybody can build whatever they want, without asking anyone else for permission.

So if you’re the entrepreneurial type, and you’re looking for the next Big Idea to make a startup out of, I’ve got one for you:

Build a directory of progressive web apps.

Call it a store if you want. Or a marketplace. Heck, you could even call it a portal, because, let’s face it, that’s kind of what app stores are.

Opera have already built you a prototype. It’s basic but it already has a bit of categorisation. As progressive web apps get more common though, what we’re really going to need is curation. Again, there’s no reason to wait for somebody else—Google, Opera, whoever—to build this.

Oh, I guess I should provide a business model too. Hmmm …let me think. Advertising masquerading as “featured apps”? I dunno—I haven’t really thought this through.

Anyway, you might be thinking, what will happen if someone beats you to it? Well, so what? People will come to your progressive web app directory because of your curation. It’s actually a good thing if they have alternatives. We don’t want a repeat of the Google Reader situation.

It’s hard to recall now, but there was a time when there wasn’t one dominant search engine. There’s nothing inevitable about Google “owning” search or Facebook “owning” social networking. In fact, they both came out of an environment of healthy competition, and crucially neither of them were first to market. If that mattered, we’d all still be using Yahoo and Friendster.

So go ahead and build that progressive web app store. I’m serious. It will, of course, need to be a progressive web app itself so that people can install it to their home screens and perhaps even peruse your curated collection when they’re offline. I could imagine that people might even end up with multiple progressive web app stores added to their home screens. It might even get out of control after a while. There’d need to be some kind of curation to help people figure out the best directory for them. Which brings me to my next business idea:

Build a directory of directories of progressive web apps…

Friday, June 10th, 2016

A wager on the web

Jason has written a great post about progressive web apps. It’s also a post about whether fears of the death of the web are justified.

Lately, I vacillate on whether the web is endangered or poised for a massive growth due to the web’s new capabilities. Frankly, I think there are indicators both ways.

So he applies Pascal’s wager. The hypothesis is that the web is under threat and progressive web apps are a solution to fighting that threat.

  • If the hypothesis is incorrect and we don’t build progressive web apps, things continue as they are on the web (which is not great for users—they have to continue to put up with fragile, frustratingly slow sites).
  • If the hypothesis is incorrect and we do build progressive web apps, users get better websites.
  • If the hypothesis is correct and we do build progressive web apps, users get better websites and we save the web.
  • If the hypothesis is correct and we don’t build progressive web apps, the web ends up pining for the fjords.

Whether you see the web as threatened or see Chicken Little in people’s fears and whether you like progressive web apps or feel it is a stupid Google marketing thing, we can all agree that putting energy into improving the experience for the people using our sites is always a good thing.

Jason is absolutely correct. There are literally no downsides to us creating progressive web apps. Everybody wins.

But that isn’t the question that people have been tackling lately. None of these (excellent) blog posts disagree with the conclusion that building progressive web apps as originally defined would be a great move forward for the web:

The real question that comes out of those posts is whether it’s good or bad for the future of progressive web apps—and by extension, the web—to build stop-gap solutions that use some progressive web app technologies (Service Workers, for example) while failing to be progressive in other ways (only working on mobile devices, for example).

In this case, there are two competing hypotheses:

  1. In the short term, it’s okay to build so-called progressive web apps that have a fragile technology stack or only work on specific devices, because over time they’ll get improved and we’ll end up with proper progressive web apps in the long term.
  2. In the short term, we should build proper progressive web apps, and it’s a really bad idea to build so-called progressive web apps that have a fragile technology stack or only work on specific devices, because that encourages more people to build sub-par websites and progressive web apps become synonymous with door-slamming single-page apps in the long term.

The second hypothesis sounds pessimistic, and the first sounds optimistic. But the people arguing for the first hypothesis aren’t coming from a position of optimism. Take Christian’s post, for example, which I fundamentally disagree with:

End users deserve to have an amazing, form-factor specific experience. Let’s build those.

I think end users deserve to have an amazing experience regardless of the form-factor of their devices. Christian’s viewpoint—like Alex’s tweetstorm—is rooted in the hypothesis that the web is under threat and in danger. The conclusion that comes out of that—building mobile-only JavaScript-reliant progressive web apps is okay—is a conclusion reached through fear.

Never make any decision based on fear.

Friday, June 3rd, 2016

Taking an online book offline

Application Cache is—as Jake so infamously described—not a good API. It was specced and shipped before developers had a chance to figure out what they really needed, and so AppCache turned out to be frustrating at best and downright dangerous in some situations. Its over-zealous caching combined with its byzantine cache invalidation ensured it was never going to become a mainstream technology.

There are very few use-cases for AppCache, but I think I hit upon one of them. Six years ago, A Book Apart published HTML5 For Web Designers. A year and a half later, I put the book online. The contents are never going to change. There’s a second edition of the book out now but if you want to read all the extra bits that Rachel added, you’re going to have to buy the book. The website for the original book is static and unchanging. That’s what made it such a good candidate for using AppCache. I could just set it and forget.

Except that’s no longer true. AppCache is being deprecated and browsers are starting to withdraw support. Chrome is already making sure that AppCache—like geolocation—no longer works on sites that aren’t served over HTTPS. That’s for the best. In retrospect, those APIs should never have been allowed over unsecured HTTP.

I mentioned that I spent the weekend switching all my book websites over to HTTPS, so AppCache should continue to work …for now. It’s only a matter of time before AppCache is removed completely from many of the browsers that currently support it.

Seeing as I’ve got the HTML5 For Web Designers site running on HTTPS now, I might as well go all out and make it a progressive web app. By far the biggest barrier to making a progressive web app is that first step of setting up HTTPS. It’s gotten cheaper—thanks to Let’s Encrypt Certbot—but it still involves mucking around in the command line with root access; I never wanted to become a sysadmin. But once that’s finally all set up, the other technological building blocks—a Service Worker and a manifest file—are relatively easy.

In this case, the Service Worker is using a straightforward bit of logic:

  • On installation, cache absolutely everything: HTML, CSS, images.
  • When anything is requested, grab it from the cache.
  • If it isn’t in the cache, try the network.
  • If the network doesn’t work, show an offline page (or image).

Basically I’m reproducing AppCache’s overzealous approach. It works for this site because the content is never going to change. I hope that this time, I really can just set it and forget it. I want the site to be an historical artefact, available at the same URL for at least my lifetime. I don’t want to have to maintain it or revisit it every few years to swap out one API for another.

Which brings me back to the way AppCache is being deprecated…

The Firefox team are very eager to ditch AppCache as soon as possible. On the one hand, that’s commendable. They’re rightly proud of shipping Service Workers and they want to encourage people to use the better technology instead. But it sure stings for the suckers (like me) who actually went and built stuff using AppCache.

In a weird way, I think this rush to deprecate AppCache might actually hurt the adoption of Service Workers. Let me explain…

At last year’s Edge Conference, Nolan Lawson gave a great presentation on storing data in the browser. He enumerated the many ways—past and present—that we could store data locally: WebSQL, Local Storage, IndexedDB …the list goes on. He also posed the question: why aren’t more people using insert-name-of-latest-API-here? To me it seemed obvious why more people weren’t diving into using the latest and greatest option for local data storage. It was because they had been burned before. The developers who rushed into trying previous solutions end up being mocked for their choice. “Still using that ol’ thing? Pffftt!”

You can see that same attitude on display from Mozilla as they push towards removing AppCache. Like in a comment that refers to developers using AppCache in production as “the angry hordes”. Reminds me of something Tom said:

In that same Mozilla thread, Soledad echoes Tom’s point:

As a member of the devrel team: I think that this should be better addressed in a blog post that someone from the team responsible for switching AppCache off should write, so everyone can understand the reasons and ask questions to those people.

I’d rather warn people beforehand, pointing them to that post and help them with migration paths than apply emergency mitigation strategies when a lot of people find their stuff stopped working in the newer Firefox…

Bravo! That same approach should have also been taken by the Chrome team when it came to their thread about punishing display:browser in manifest files. There was absolutely no communication with developers about this major decision. I only found out about it because Paul happened to mention it to me.

I was genuinely shocked by this:

Withholding the “add to home screen” prompt like that has a whiff of blackmail about it.

I can confirm that smell. When I was making the manifest file for HTML5 For Web Designers, I really wanted to put display: browser because I want people to be able to copy and paste URLs (for the book, for individual chapters, and for sections within chapters). But knowing that if I did that, Android users would never see the “add to home screen” prompt made me question that decision. I felt strong-armed into declaring display: standalone. And no, I’m not mollified by hand-waving reassurances that the Chrome team will figure out some solution for this. Figure out the solution first, then punish the saps like me who want to use display: browser to allow people to share URLs.

Anyway, the website for HTML5 For Web Designers is now using AppCache and Service Workers. The AppCache part will probably be needed for quite a while yet to provide offline support on iOS. Apple are really dragging their heels on Service Worker support, with at least one WebKit engineer actively looking for reasons not to implement it.

There’s a lot of talk about making apps work offline, but I think it’s just as important that we consider making information work offline. Books are a great example of this. To use the tired transport tropes, the website for a book is something you might genuinely want to access when you’re on a plane, or in the underground, or out at sea.

I really, really like progressive web apps. But I also think it’s important that we don’t fall into the trap of just trying to imitate native apps on the web. I love the idea of taking the best of the web—like information being permanently available at a URL—and marrying that up with the best of native—like offline access. I also like the idea of taking the best of books—a tome of thought—and marrying it up with the best of the web—hypertext.

I’d love to see more experimentation around online/offline hypertext/books. For now, you can visit HTML5 For Web Designers, add it to your home screen, and revisit it whenever and wherever you like.

Monday, May 30th, 2016

Regression toward being mean

I highly recommend Remy’s State Of The Gap post—it’s ace. He summarises it like this:

I strongly believe in the concepts behind progressive web apps and even though native hacks (Flash, PhoneGap, etc) will always be ahead, the web, always gets there. Now, today, is an incredibly exciting time to be build on the web.

I agree completely. That might sound odd after I wrote about Regressive Web Apps, but it’s precisely because I’m so excited by the technologies behind progressive web apps that I think it’s vital that we do them justice. As Remy says:

Without HTTPS and without service workers, you can’t add to homescreen. This is an intentionally high bar of entry with damn good reasons.

When the user installs a PWA, it has to work. It’s our job as web developers to provide the most excellent experience for our users.

It has to work.

That’s why I don’t agree with Dion’s metrics for what makes a progressive web app:

If you deliver an experience that only works on mobile is that a PWA? Yes.

I think it’s important to keep quality control high. Being responsive is literally the first item in the list of qualities that help define what a progressive web app is. That’s why I wrote about “regressive” web apps: sites that are supposed to showcase what we can do but instead take a step backwards into the bad old days of separate sites for separate device classes:,,,,

A lot of people on Twitter misinterpreted my post as saying “the current crop of progressive web apps are missing the mark, therefore progressive web apps suck”. What I was hoping to get across was “the current crop of progressive web apps are missing the mark, so let’s make better ones!”

Now, I totally understand that many of these examples are a first stab, a way of testing the waters. I absolutely want to encourage these first attempts and push them further. But I don’t think that waiving the qualifications for progressive web apps helps achieves that. As much as I want to acknowledge the hard work that people have done to create those device-specific examples, I don’t think we should settle for anything less than high-quality progressive web apps that are as much about the web as they are about apps.

Simply put, in this instance, I don’t think good intentions are enough.

Which brings me to the second part of Regressive Web Apps, the bit about Chrome refusing to show the “add to home screen” prompt for sites that want to have their URL still visible when launched from the home screen.

Alex was upset by what I wrote:

if you think the URL is going to get killed on my watch then you aren’t paying any attention whatsoever.

so, your choices are to think that I have a secret plan to kill URLs, or conclude I’m still Team Web.

I’m galled that anyone, particularly you @adactio, would think the former…but contrarianism uber alles?

I am very, very sorry that I upset Alex like this.

But I stand by my criticism of the actions of the Chrome team. Because good intentions are not enough.

I know that Alex is huge fan of URLs, and of the web. Heck, just about everybody I know that works on Chrome in some capacity are working for the web first and foremost: Alex, Jake, various and sundry Pauls. But that doesn’t mean I’m going to stay quiet when I see the Chrome team do something I think is bad for the web. If anything, it’s precisely because I hold them to a high standard that I’m going to sound the alarm when I see what I consider to be missteps.

I think that good people can make bad decisions with the best of intentions. Usually it involves long-term thinking—something I think is very important. “The ends justify the means” is a way of thinking that can create a lot of immediate pain, even if it means a better future overall. Balancing those concerns is front and centre of the Chromium project:

As browser implementers, we find that there’s often tension between (a) moving the web forward and (b) preserving compatibility. On one hand, the web platform API surface must evolve to stay relevant. On the other hand, the web’s primary strength is its reach, which is largely a function of interoperability.

For example, when Alex talks of the Web Component era as though it were an inevitability, I get nervous. Not for myself, but for the millions of Opera Mini users out there. How do we get to a better future without leaving anyone behind? Or do we sacrifice those people for the greater good? Do the needs of the many outweigh the needs of the few? Do the ends justify the means?

Now, I know for a fact that the end-game that Alex is pursuing with web components—and the extensible web manifesto in general—is a more declarative web: solutions that first get tackled as web components end up landing in browsers. But to get there, the solutions are first created using modern JavaScript that simply doesn’t work everywhere. Is that the price we’re going to have to pay for a better web?

I hope not. I hope we can find ways to have our accessible cake and eat it too. But it will be really, really hard.

Returning to progressive web apps, I was genuinely shocked and appalled at the way that the Chrome team altered the criteria for the “add to home screen” prompt to discourage exposing URLs. I was also surprised at how badly the change was communicated—it was buried in a bug report that five people contributed to before pushing the change. I only found out about it through a conversation with Paul Kinlan. Paul encouraged me to give feedback, and that’s what I did on my website, just like Stuart did on his.

Of course the Chrome team are working on ways of exposing URLs within progressive web apps that are launched in from the home screen. Opera are working on it too. But it’s a really tricky problem to solve. It’s not enough to say “we’ll figure it out”. It’s not enough to say “trust us.”

I do trust the people I know working on Chrome. I also trust the people I know at Mozilla, Opera and Microsoft. That doesn’t mean I’m going to let their actions go unquestioned. Good intentions are not enough.

As Alex readily acknowledges, the harder problem (figuring out how to expose URLs) should have been solved first—then the change to the “add to home screen” metrics would be uncontentious. Putting the cart before the horse, discouraging display:browser now, while saying “trust us, we’ll figure it out”, is another example of saying the ends justify the means.

But the stakes are too high here to let this pass. Good intentions are not enough. Knowing that the people working on Chrome (or Firefox, or Opera, or Edge) are good people is not reason enough to passively accept every decision they make.

Alex called me out for not getting in touch with him directly about the Chrome team’s future plans with URLs, but again, that kind of rough consensus to do something is trumped by running code. Also, I did talk to Chrome people—this all came out of a discussion with Paul Kinlan. I don’t know who’s who in the company’s political hierarchy and I don’t think I should need an org chart to give feedback to Google (or Mozilla, or Opera, or Microsoft).

You’ll notice that I didn’t include Apple there. I don’t hold them to the same high standard. As it turns out, I know some very good people at Apple working on WebKit and Safari. As individuals, they care about the web. But as a company, Apple has shown indifference towards web developers. As Remy put it:

Even getting the hint of interest from Apple is a process of dumpster-diving the mailing lists scanning for the smallest hint of interest.

With that in mind, I completely understand Alex’s frustration with my post on “regressive” web apps. Although I intended it as a push towards making better progressive web apps, I can see how it could be taken as confirmation by those who think that progressive web apps aren’t worth investing in. Apple, for example. As it is, they’ll have to be carried kicking and screaming into adding support for Service Workers, manifest files, and other building blocks. From the reaction to my post from at least one WebKit developer on Twitter, not only did I fail to get across just how important the technologies behind progressive web apps are, I may have done more harm than good, giving ammunition to sceptics.

Still, I hope that most people took my words in the right spirit, like Addy:

We should push them to do much better. I’ll file bugs. Per @adactio post, can’t forget the ‘Progressive’ part of PWAs

Seeing that reaction makes me feel good …but seeing Alex’s reaction makes me feel bad. Very bad. I’m genuinely sorry that I made Alex feel that way. It wasn’t my intention but, well …good intentions are not enough.

I’ve been looking back at what I wrote, trying to see it through Alex’s eyes, looking for the parts that could be taken as a personal attack:

Chrome developers have decided that displaying URLs is not “best practice” … To declare that all users of all websites will be confused by seeing a URL is so presumptuous and arrogant that it beggars belief. … Withholding the “add to home screen” prompt like that has a whiff of blackmail about it. … This isn’t the first time that Chrome developers have made a move against the address bar. It’s starting to grind me down.

Some pretty strong words there. I stand by them, but the tone is definitely strident.

When we criticise something—a piece of software, a book, a website, a film, a piece of music—it’s all too easy to forget that there are real people behind it. But that isn’t the case here. I know that there are real people working on Chrome, because I know quite a few of those people. I also know that their intentions are good. That’s not a reason for me to remain silent—that’s a reason for me to speak up.

If I had known that my post was going to upset Alex, would I have still written it? That’s a tough one. On the one hand, this is a topic I care passionately about. I think it’s vital that we don’t compromise on the very things that make the web great. On the other hand, who knows if what I wrote will make the slightest bit of difference? In which case, I got the catharsis of getting it off my chest but at the price of upsetting somebody I respect. That price feels too high.

I love the fact that I can publish whatever I want on my own website. It can be a place for me to be enthusiastic about things that excite me, and a place for me to rant about things that upset me. I estimate that the enthusiastic stuff outnumbers the ranty stuff by about ten to one, but negativity casts a disproportionately large shadow.

I need to get better at tempering my words. Not that I’m going to stop criticising bad decisions when I see them, but I need to make my intentions clearer …because just having good intentions is not enough. Throughout this post, I’ve mentioned repeatedly how much I respect the people I know working on the Chrome team. I should have said that in my original post.

Sunday, May 29th, 2016

A little progress

I’ve got a fairly simple posting interface for my notes. A small textarea, an optional file upload, some checkboxes for syndicating to Twitter and Flickr, and a submit button.

Notes posting interface

It works fine although sometimes the experience of uploading a file isn’t great, especially if I’m on a slow connection out and about. I’ve been meaning to add some kind of Ajax-y progress type thingy for the file upload, but never quite got around to it. To be honest, I thought it would be a pain.

But then, in his excellent State Of The Gap hit parade of web technologies, Remy included a simple file upload demo. Turns out that all the goodies that have been added to XMLHttpRequest have made this kind of thing pretty easy (and I’m guessing it’ll be easier still once we have fetch).

I’ve made a little script that adds a progress bar to any forms that are POSTing data.

Feel free to use it, adapt it, and improve it. It isn’t using any ES6iness so there are some obvious candidates for improvement there.

It’s working a treat on my little posting interface. Now I can stare at a slowly-growing progress bar when I’m out and about on a slow connection.

Switching to HTTPS on Apache 2.4.7 on Ubuntu 14.04 on Digital Ocean

I’ve been updating my book sites over to HTTPS:

They’re all hosted on the same (virtual) box as—Ubuntu 14.04 running Apache 2.4.7 on Digital Ocean. If you’ve got a similar configuration, this might be useful for you.

First off, I’m using Let’s Encrypt. Except I’m not. It’s called Certbot now (I’m not entirely sure why).

I installed the Let’s Encertbot client with this incantation (which, like everything else here, will need root-level access so if none of these work, retry using sudo in front of the commands):

chmod a+x certbot-auto

Seems like a good idea to put that certbot-auto thingy into a directory like /etc:

mv certbot-auto /etc

Rather than have Certbot generate conf files for me, I’m just going to have it generate the certificates. Here’s how I’d generate a certificate for

/etc/certbot-auto --apache certonly -d

The first time you do this, it’ll need to fetch a bunch of dependencies and it’ll ask you for an email address for future reference (should anything ever go screwy). For subsequent domains, the process will be much quicker.

The result of this will be a bunch of generated certificates that live here:

  • /etc/letsencrypt/live/
  • /etc/letsencrypt/live/
  • /etc/letsencrypt/live/
  • /etc/letsencrypt/live/

Now you’ll need to configure your Apache gubbins. Head on over to…

cd /etc/apache2/sites-available

If you only have one domain on your server, you can just edit default.ssl.conf. I prefer to have separate conf files for each domain.

Time to fire up an incomprehensible text editor.


There’s a great SSL Configuration Generator from Mozilla to help you figure out what to put in this file. Following the suggested configuration for my server (assuming I want maximum backward-compatibility), here’s what I put in.

Make sure you update the /path/to/ part—you probably want a directory somewhere in /var/www or wherever your website’s files are sitting.

To exit the infernal text editor, hit ctrl and o, press enter in response to the prompt, and then hit ctrl and x.

If the didn’t previously exist, you’ll need to enable the configuration by running:


Time to restart Apache. Fingers crossed…

service apache2 restart

If that worked, you should be able to go to and see a lovely shiny padlock in the address bar.

Assuming that worked, everything is awesome! …for 90 days. After that, your certificates will expire and you’ll be left with a broken website.

Not to worry. You can update your certificates at any time. Test for yourself by doing a dry run:

/etc/certbot-auto renew --dry-run

You should see a message saying:

Processing /etc/letsencrypt/renewal/

And then, after a while:

** DRY RUN: simulating 'certbot renew' close to cert expiry
** (The test certificates below have not been saved.)
Congratulations, all renewals succeeded.

You could set yourself a calendar reminder to do the renewal (without the --dry-run bit) every few months. Or you could tell your server’s computer to do it by using a cron job. It’s not nearly as rude as it sounds.

You can fire up and edit your list of cron tasks with this command:

crontab -e

This tells the machine to run the renewal task at quarter past six every evening and log any results:

15 18 * * * /etc/certbot-auto renew --quiet >> /var/log/certbot-renew.log

(Don’t worry: it won’t actually generate new certificates unless the current ones are getting close to expiration.) Leave the cronrab editor by doing the ctrl o, enter, ctrl x dance.

Hopefully, there’s nothing more for you to do. I say “hopefully” because I won’t know for sure myself for another 90 days, at which point I’ll find out whether anything’s on fire.

If you have other domains you want to secure, repeat the process by running:

/etc/certbot-auto --apache certonly -d

And then creating/editing /etc/apache2/sites-available/ accordingly.

I found these useful when I was going through this process:

That last one is good if you like the warm glow of accomplishment that comes with getting a good grade:

For extra credit, you can run your site through to harden your headers. Again, not as rude as it sounds.

You know, I probably should have said this at the start of this post, but I should clarify that any advice I’ve given here should be taken with a huge pinch of salt—I have little to no idea what I’m doing. I’m not responsible for any flame-bursting-into that may occur. It’s probably a good idea to back everything up before even starting to do this.

Yeah, I definitely should’ve mentioned that at the start.

Tuesday, May 24th, 2016

Regressive Web Apps

There were plenty of talks about building for the web at this year’s Google I/O event. That makes a nice change from previous years when the web barely got a look in and you’d be forgiven for thinking that Google I/O was an event for Android app developers.

This year’s event showed just how big Google is, and how it doesn’t have one party line when it comes to the web and native. At the same time as there were talks on Service Workers and performance for the web, there was also an unveiling of Android Instant Apps—a full-frontal assault on the web. If you thought it was annoying when websites door-slammed you with intrusive prompts to install their app, just wait until they don’t need to ask you anymore.

Peter has looked a bit closer at Android Instant Apps and I think he’s as puzzled as I am. Either they are sandboxed to have similar permission models to the web (in which case, why not just use the web?) or they allow more access to native APIs in which case they’re a security nightmare waiting to happen. I’m guessing it’s probably the former.

Meanwhile, a different part of Google is fighting the web’s corner. The buzzword du jour is Progressive Web Apps, originally defined by Alex as:

  • Responsive
  • Connectivity independent
  • App-like-interactions
  • Fresh
  • Safe
  • Discoverable
  • Re-engageable
  • Installable
  • Linkable

A lot of those points are shared by good native apps, but the first and last points in that list are key features of the web: being responsive and linkable.

Alas many of the current examples of so-called Progressive Web Apps are anything but. Flipkart and The Washington Post have made Progressive Web Apps that are getting lots of good press from Google, but are mobile-only.

Looking at most of the examples of Progressive Web Apps, there’s an even more worrying trend than the return to m-dot subdomains. It looks like most of them are concentrating so hard on the “app” part that they’re forgetting about the “web” bit. That means they’re assuming that modern JavaScript is available everywhere.

Alex pointed to as an example of a Progressive Web App that is responsive as well as being performant and resilient to network failures. It also requires JavaScript (specifically the Polymer polyfill for web components) to render some text and images in a browser. If you’re using the “wrong” browser—like, say, Opera Mini—you get nothing. That’s not progressive. That’s the opposite of progressive. The end result may feel very “app-like” if you’re using an approved browser, but throwing the users of other web browsers under the bus is the very antithesis of what makes the web great. What does it profit a website to gain app-like features if it loses its soul?

I’m getting very concerned that the success criterion for Progressive Web Apps is changing from “best practices on the web” to “feels like native.” That certainly seems to be how many of the current crop of Progressive Web Apps are approaching the architecture of their sites. I think that’s why the app-shell model is the one that so many people are settling on.

Personally, I’m not a fan of the app-shell model. I feel that it prioritises exactly the wrong stuff—the interface is rendered quickly while the content has to wait. It feels weirdly like a hangover from Appcache. I also notice it being used as a get-out-of-jail-free card, much like the ol’ “Single Page App” descriptor; “Ah, I can’t do progressive enhancement because I’m building an app shell/SPA, you see.”

But whatever. That’s just, like, my opinion, man. Other people can build their app-shelled SPAs and meanwhile I’m free to build websites that work everywhere, and still get to use all the great technologies that power Progressive Web Apps. That’s one of the reasons why I’ve been quite excited about them—all the technologies and methodologies they promote match perfectly with my progressive enhancement approach: responsive design, Service Workers, good performance, and all that good stuff.

I hope we’ll see more examples of Progressive Web Apps that don’t require JavaScript to render content, and don’t throw away responsiveness in favour of a return to device-specific silos. But I’m not holding my breath. People seem to be so caught up in the attempt to get native-like functionality that they’re willing to give up the very things that make the web great.

For example, I’ve seen people use a meta viewport declaration to disable pinch-zooming on their sites. As justification they point to the fact that you can’t pinch-zoom in most native apps, therefore this web-based app should also prohibit that action. The inability to pinch-zoom in native apps is a bug. By also removing that functionality from web products, people are reproducing unnecessary bugs. It feels like a cargo-cult approach to building for the web: slavishly copy whatever native is doing …because everyone knows that native apps are superior to websites, right?

Here’s another example of the cargo-cult imitation of native. In your manifest JSON file, you can declare a display property. You can set it to browser, standalone, or fullscreen. If you set it to standalone or fullscreen then, when the site is launched from the home screen, it won’t display the address bar. If you set the display property to browser, the address bar will be visible on launch. Now, personally I like to expose those kind of seams:

The idea of “seamlessness” as a desirable trait in what we design is one that bothers me. Technology has seams. By hiding those seams, we may think we are helping the end user, but we are also making a conscience choice to deceive them (or at least restrict what they can do).

Other people disagree. They think it makes more sense to hide the URL. They have a genuine concern that users will be confused by launching a website from the home screen in a browser (presumably because the user’s particular form of amnesia caused them to forget how that icon ended up on their home screen in the first place).

Fair enough. We’ll agree to differ. They can set their display property how they want, and I can set my display property how I want. It’s a big web after all. There’s no one right or wrong way to do this. That’s why there are multiple options for the values.

Or, at least, that was the situation until recently…

Remember when I wrote about how Chrome on Android will show an “add to home screen” prompt if your Progressive Web App fulfils a few criteria?

  • It is served over HTTPS,
  • it has a manifest JSON file,
  • it has a Service Worker, and
  • the user visits it a few times.

Well, those goalposts have moved. There is now a new criterion:

  • Your manifest file must not contain a display value of browser.

Chrome developers have decided that displaying URLs is not “best practice”. It was filed as a bug.

A bug.

Displaying URLs.

A bug.

I’m somewhat flabbergasted by this. The killer feature of the web—URLs—are being treated as something undesirable because they aren’t part of native apps. That’s not a failure of the web; that’s a failure of native apps.

Now, don’t get me wrong. I’m not saying that everyone should be setting their display property to browser. That would be far too prescriptive. I’m saying that it should be a choice. It should depend on the website. It should depend on the expectations of the users of that particular website. To declare that all users of all websites will be confused by seeing a URL is so presumptuous and arrogant that it beggars belief.

I wouldn’t even have noticed this change of policy if it weren’t for the newly-released Lighthouse tool for testing Progressive Web Apps. The Session gets a good score but under “Best Practices” there was a red mark against the site for having display: browser. Turns out that’s the official party line from Chrome.

Just to clarify: you can have a site that has literally no HTML or turns away entire classes of devices, yet officially follows “best practices” and gets rewarded with an “add to home screen” prompt. But if you have a blazingly fast responsive site that works offline, you get nothing simply because you don’t want to hide URLs from your users:

I want people to be able to copy URLs. I want people to be able to hack URLs. I’m not ashamed of my URLs …I’m downright proud.

Stuart argues that this is a paternal decision:

The app manifest declares properties of the app, but the display property isn’t about the app; it’s about how the app’s developer wants it to be shown. Do they want to proudly declare that this app is on the web and of the web? Then they’ll add the URL bar. Do they want to conceal that this is actually a web app in order to look more like “native” apps? Then they’ll hide the URL bar.

I think there’s something to that, but digging deeper, developers and designers don’t make decisions like that in isolation. They’re generally thinking about what’s best for users. So, yes, absolutely, different apps will have different display properties, but that shouldn’t be down to the belief system of the developer; it should be down to the needs of the users …the specific needs of the specific users of that specific app. For the Chrome team to come down on one side or the other and arbitrarily declare that one decision is “correct” for every single Progressive Web App that is ever going to be built …that’s a political decision. It kinda feels like an abuse of power to me. Withholding the “add to home screen” prompt like that has a whiff of blackmail about it.

The other factors that contribute to the “add to home screen” prompt are pretty uncontroversial:

  • Sites should be served over a secure connection: that’s pretty hard to argue with.
  • Sites should be resilient to network outages: I don’t think anyone is going to say that’s a bad idea.
  • Sites should provide some metadata in manifest file: okay, sure, it’s certainly not harmful.
  • Sites should obscure their URL …whoa! That feels like a very, very different requirement, one that imposes one particular opinion onto everyone who wants to participate.

This isn’t the first time that Chrome developers have made a move against the address bar. It’s starting to grind me down.

Up until now I’ve been a big fan of Progressive Web Apps. I understood them to be combining the best of the web (responsiveness, linkability) with the best of native (installable, connectivity independent). Now I see that balance shifting towards the native end of the scale at the expense of the web’s best features. I’d love to see that balance restored with a little less emphasis on the “Apps” and a little more emphasis on the “Web.” Now that would be progressive.

Thursday, May 19th, 2016

Owning my words

When I wrote a few words about progressive enhancement recently, I linked to Karolina’s great article The Web Isn’t Uniform. I was a little reluctant to link to it, not because of the content—which is great—but because of its location on Ev’s blog. I much prefer to link directly to people’s own websites (I have a hunch that those resources tend to last longer too) but I understand that Medium offers a nice low barrier to publishing.

That low barrier comes at a price. It means you have to put up with anyone and everyone weighing in with their own hot takes. The way the site works is that anyone who writes a comment on your article is effectively writing their own article—you don’t get to have any editorial control over what kind of stuff appears together with your words. There is very little in the way of community management once a piece is published.

Karolina’s piece attracted some particularly unsavoury snark—tech bros disagreeing in their brash bullying way. I linked to a few comments, leaving out the worst of the snark, but I couldn’t resist editorialising:

Ah, Medium! Where the opinions of self-entitled dudes flow like rain from the tech heavens.

I knew even when I was writing it that it was unproductive, itself a snarky remark. Two wrongs don’t make a right. But I wanted to acknowledge that not only was bad behaviour happening, but that I was seeing it, and I wasn’t ignoring it. I guess it was mostly intended for Karolina—I wanted to extend some kind of acknowledgment that the cumulative weight of those sneering drive-by reckons is a burden that no one should have to put up with.

I knew that when I wrote about Medium being “where the opinions of self-entitled dudes flow like rain from the tech heavens” that I would (rightly) get pushback, and sure enough, I did …on Medium. Not on Twitter or anywhere else, just Medium.

I syndicate my posts to Ev’s blog, so the free-for-all approach to commenting doesn’t bother me that much. The canonical URL for my words remains on my site under my control. But for people posting directly to Medium and then having to put up with other people casually shitting all over their words, it must feel quite disempowering.

I have a similar feeling with Twitter. I syndicate my notes there and if the service disappeared tomorrow, I wouldn’t shed any tears. There’s something very comforting in knowing that any snarky nasty responses to my words are only being thrown at copies. I know a lot of my friends are disheartened about the way that Twitter has changed in recent years. I wish I could articulate how much better it feels to only use Twitter (or Medium or Facebook) as a syndication tool, like RSS.

There is an equal and opposite reaction too. I think it’s easier to fling off some thoughtless remarks when you’re doing it on someone else’s site. I bet you that the discourse on Ev’s blog would be of a much higher quality if you could only respond from your own site. I find I’m more careful with my words when I publish here on I’m taking ownership of what I say.

And when I do lapse and write snarky words like “Ah, Medium! Where the opinions of self-entitled dudes flow like rain from the tech heavens.”, at least I’m owning my own snark. Still, I will endeavour to keep my snark levels down …but that doesn’t mean I’m going to turn a blind eye to bad behaviour.