It’s the time of year when you reflect and refocus. With the recent news of Edge and WebKit bringing service workers to their people, it is hard not to reflect on the long journey of bringing rich, some may say app-like, capabilities to the Web.
With 2017 sunsetting (in some ways: good riddance!), I thought back ten years to 2007. You may remember the simpler times where Arnold was the Governator in California, Mad Men and Flight of the Conchords were on the scene, and Steve Jobs showed us his new phone.
In the world of the Web, I was working on Google Gears.
This was a pre-Chrome world where developers who were trying to bring bleeding edge desktop web apps (Gmail, Google Docs, etc) often reached to a browser plugin to deliver the functionality that they needed (Flash and Silverlight). We were seeing a resurgence in using HTML/CSS/ and JS to power the UI, using plugins to get access to some native capabilities — Remember XMLHTTPRequest was born as an IE ActiveX component.
Picture yourself with a Gmail that nailed spam and search so well that Eudora was tossed aside. One restriction though was the reliance of a tether to the Internet. A next obvious step was to take Gmail offline (including that great search!) and improve all of the perf (always an issue ;).
Gears brought us the modules to do just this, and it is fascinating to see which primitives we ended up with:
- A Database module (powered by SQLite), which could store data locally
- A WorkerPool module, which provided parallel execution of JavaScript code
- A LocalServer module, which cached and served application resources (HTML, JavaScript, images, etc.)
- A Desktop module, which let web applications interact more naturally with the desktop
- A Geolocation module, which let web applications detect the geographical location of their users (Google Maps any one!!!)
How many of these are still needed to pull off a great web experience, worthy of the home screen addition from a loyal user, even as we have moved to mobile and beyond?
But a browser plugin wasn’t the ideal solution. You want the platform itself to grab onto good ideas and bake them in (hopefully learning from the implementations to come up with something much better). Also, 2007 remember….. with Safari on iPhone, and Jobs said “nope” to the plugin world (and thus the fall of Flash and Silverlight).
Let’s take a peak at the problems we were solving and what the solutions we now have available, with the new context of mobile, and where we can be heading in 2018!
Dealing with data
The Gmail team dealt with much pain on the bleeding edge as everyone worked out how to store (sometimes large amounts of) data correctly locally and sync it with the backend.
We quickly codified SQLite into the platform via WebSQL, which didn’t quite stick. There were issues with baking in an implementation into a standard, but I also wonder how much gas was lost from the effort because the world jumped into a “NoSQL” bandwagon. The many benefits of SQL have held the test of time, and with new innovations such as Spanner, I do sometimes wonder if it wouldn’t be kinda great to have SQL back in the client toolbox?
Instead we got the likes of DOMStorage and IndexedDB, as well as many solutions on top of our primitives. Today we see a lot of usage of Firebase (including the new Firestore which has offline support on the Web!) and there is also large mindshare in the GraphQL space, with great clients such as Apollo.
So, we have a lot of work going on with respect to data, both on the client and how to sync back to the backend, but I think we will see new patterns emerge in 2018 that will put everything together.
Working off thread
As we constructed richer applications through JavaScript, and accessing local capabilities like databases, we needed to be able to do this work away from the UI thread, else the apps became unresponsive. Thus, Gears brought us WorkerPool, which was morphed into the Web Workers standard.
Doing less work on the main thread continues to very much be a key bottleneck, especially in a world of low power CPUs! Phil Walton just posted on this from the vantage point of interactivity, and the lack thereof, and we have exciting work landing and in process.
Browser vendors are hitting this head on in their implementations, with large architecture changes (e.g. Quantum has a lot of this baked in) as well as tactical upgrades (e.g. image decoding happening elsewhere).
We are also seeing new standards that bake new abilities, from tweaks such as img decoding, and large additions such as the awesome Animation Worket that will truly change the game.
When it comes to new capabilities, we often follow the pattern of:
- Step one: make it possible.
- Step two: make it easier.
- Step three: make it perform.
This is one reason I got excited about Surma’s exploration: COMlink, that gives you the same API across windows, iframes, Web Workers and Service Workers — speaking of which….
A Local Serv…ice
The browser was built as a client desktop application that sat on a nice fat university pipe. I remember that world fondly, where I had an Sun Ultra as my workstation, and I could also login to any machine on campus and have my X windows show up just they were.
The network was never perfect, but as it diversified, and our devices walked around with us, we needed to handle the lack of network progressively. The Gears LocalServer module came with a couple of cool features. One of them was the Gears JSON manifest file, somewhat akin to AppCache, that allowed for a declarative approach. Declarative APIs are great until you need to break out of the box. In that case you long for an imperative API that the declarative one builds on. LocalServer gave you a programatic API too, but it was much more restrictive than what we have today in the powerful Service Worker, where you get to fully own the networking layer. With this power comes great responsibility and is one that you need to think through up front, making sure that you have the correct kill switches in place, and processes to fully test.
Service Workers were a perfect example of the Extended Web in action. A powerful building block for us all to build on top of, including the web platform itself, as we have seen with Web Push and friends.
Native capabilities
When the Web is at its best, it allows you to reach the broadest set of users, but also allows them to experience it on their terms. This is why a UI change to make image picking better (often feeling more akin to other image picking on that particular device) can have a large impact. It is also why I have been a fan of extensions, allowing users to customize to break out of the A/B optimizing machines.
Gears had a Desktop module that allowed you to drop an icon for your web application that could now serve locally and store data via SQLite.
Home screen access is even more important in the world of mobile, so that is where we first saw this support via the Add To Home Screen API. This doesn’t mean that I don’t want it on my desktop too though, and I look forward to great desktop PWA support in 2018!
Gears drove some of these native capabilities, and in general I like to see developers being able to push the boundaries, and having the platform standardize the good ones later. This is one reason that I keen to see how developers use Trusted Web Activities, which gives you the ability to bridge native and Web in a new way.
Now we have seen how the specific Gears modules have baked themselves into the core platform. It is also interesting to look at the areas that weren’t a focus then, and how we are now going well beyond the issues of the day.
The Google Apps of the day were large codebases. Throngs of JavaScript were being flung, and Closure was the weapon of choice to keep the codebase sane. We got through the ES4 detour, and I am happy to see that with ES2015 we have put our requirements into the language versus comments.
Layout wasn’t as much fun back then. Without Flexbox, we had to result in a lot of tricks that required JavaScript, and we had to manually (read: use a lot of resources :/) check on what was in view versus using APIs from the Observer family (Check out Eric’s examples of the new ResizeObserver addition!).
These days we not only have Flexbox in the toolbox, but we also have the fantastic CSS Grid, and one fun way to master it is by “playing” with Dave’s Grid Critters.
https://mobile.twitter.com/trueadm/status/944908776896978946
When it comes to bringing capabilities wrapped up in native code, we now have WebAssembly at our finger-tips. I am particularly curious to see what gets wrapped and made available for the masses.
And what better way to do the wrapping that via Web Components. We have long dreamt of the ability to reuse rich UI components that were fully tested and had high quality accessibility support. It used to be frustrating to see an amazing YUI widget, that you couldn’t bring into Closure land. We are finally getting to the point where this is no longer an issue, and with SkateJS, Stencil, and Svelte joining Polymer and friends, we can share and compile like never before, and it is starting to feel like 2018 is the year of the Template Literal Libraries.
When you put this together, we can have the semantics of <something-cool> that could be wrapping rich UI and WebAssembly code under the hood.
We still have much to do, but the pieces are coming together to deliver rich experiences that can be constructed and combined by creators. In a world where we seem to spend more time consuming, I sincerely hope for 2018 to be a turning point for more of a read/write Web, and world.
Not only are we seeing the features come to light, we are seeing browser vendors coming together to implement them with haste, a huge difference from the time of Gears and ChromeFrame.
So, here’s to more green in 2018, something that I was excited about in the Chrome DevSummit keynote that I got to give with Ben:
I am curious to hear what you are looking for in 2018. It has been a lot of fun to read existing thoughts from the various end of year countdowns, and a big thanks to Mariko for inviting me to write this for http://web.advent.today/!
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