This is terrific! Jeremy shows how you can implement a fairly straightforward service worker for performance gains, but then really kicks it up a notch with a recipe for turning a regular website into a speedy single page app without framework bloat.
It’s official. The extremely niche browser behaviour I documented is a bug.
This in an intriguing promise (there’s no code yet):
A PWA typically requires writing a service worker, an app manifest and a ton of custom code. Progressier flattens the learning curve. Just add it to your html template — you’re done.
This is a great way to use a service worker to circumvent censorship:
After the visitor opens the website once over a VPN, the service worker is downloaded and installed. The VPN can then be disabled, and the service worker will take over to request content from non-blocked servers, effectively acting as a proxy.
So, why would you want to use a service worker? Here are some cool things you can do with it.
Chris lists some of the ways a service worker can enhance user experience.
Thoughts on user experience design and service design, prompted by the Clearleft podcast:
I especially enjoyed the latest episode about a topic that has become a bit of a hyped buzzword over the last few years: Service design.
Rich with anecdotes and stories, the episode started with an investigation: What is service design, anyway?
A Chrome-only API for adding offline content to an index that can be exposed in Android’s “downloads” list. It just shipped in the lastest version of Chrome.
I’m not a fan of browser-specific non-standards but you can treat this as an enhancement—implementing it doesn’t harm non-supporting browsers and you can use feature detection to test for it.
How do we tell our visitors our sites work offline? How do we tell our visitors that they don’t need an app because it’s no more capable than the URL they’re on right now?
Remy expands on his call for ideas on branding websites that work offline with a universal symbol, along the lines of what we had with RSS.
What I’d personally like to see as an outcome: some simple iconography that I can use on my own site and other projects that can offer ambient badging to reassure my visitor that the URL they’re visiting will work offline.
This is an interesting push by Remy to try to figure out a way we can collectively indicate to users that a site works offline.
Well, seeing as browsers have completely dropped the ball on any kind of ambient badging, it’s fair enough that we take matters into our own hands.
If you dodged an accessibility lawsuit because you have physical locations, what does it mean when those physical locations close?
As movie theaters, restaurant ordering, college courses, and more move to online-first delivery, the notion of a corresponding brick-and-mortar venue falls away. If the current pandemic physical distancing measures stretch into the next year as many think, then this blip becomes the de facto new normal.
80 geocoding service plans to choose from.
I’m going to squirrel this one away for later—I’ve had to switch geocoding providers in the past, so I have a feeling that this could come in handy.
Performance matters …especially when the chips are down:
If you are in charge of a web site that provides even slightly important information, or important services, it’s time to get static. I’m thinking here of sites for places like health departments (and pretty much all government services), hospitals and clinics, utility services, food delivery and ordering, and I’m sure there are more that haven’t occurred to me. As much as you possibly can, get it down to static HTML and CSS and maybe a tiny bit of enhancing JS, and pare away every byte you can.
Tantek documents the features he wants his posting interface to have.
This is a great progressive enhancement for performance that uses a service worker to combine reusable bits of a page with fresh content. The numbers are very convincing!
Alas, the code is using the Workbox library, but figuring out the vanilla code to write shouldn’t be too tricky seeing as Philip talks through his logic step by step.
This is a great proposal that would make the Cache API even more powerful by adding metadata to cached items, like when it was cached, how big it is, and how many times it’s been retrieved.
Creating a PWA has saved a lot of kilobytes after the initial load by storing files on the device to reuse on subsequent requests – this in turn lowers the load time and carbon footprint on subsequent page views, making the website better for both people and planet. We’ve also enabled offline access, which significantly improves user experience for people in areas with patchy connections, such as mobile users on their commute.
This is the transcript of a brilliant presentation by Scott—read the whole thing! It starts with a much-needed history lesson that gets to where we are now with the dismal state of performance on the web, and then gives a whole truckload of handy tips and tricks for improving performance when it comes to styles, scripts, images, fonts, and just about everything on the front end.
The dominant narrative for the growth of the World Wide Web, the graphical, user-friendly version of the internet created by Tim Berners-Lee in 1989, is that its success has been propelled by Silicon Valley venture capitalism at its most rapacious. The idea that currently prevails is that the internet is best built by venture-backed startups competing to offer services globally through category monopolies: Amazon for shopping, Google for search, Facebook for social media. These companies have generated enormous profits for their creators and early investors, but their “surveillance capitalism” business model has brought unanticipated harms.
It doesn’t have to be this way, says Ethan Zuckerman:
A public service Web invites us to imagine services that don’t exist now, because they are not commercially viable, but perhaps should exist for our benefit, for the benefit of citizens in a democracy. We’ve seen a wave of innovation around tools that entertain us and capture our attention for resale to advertisers, but much less innovation around tools that educate us and challenge us to broaden our sphere of exposure, or that amplify marginalized voices. Digital public service media would fill a black hole of misinformation with educational material and legitimate news.
Aaron outlines some sensible strategies for serving up images, including using the Cache API from your service worker script.