In the three blocks between my home and the nearest coffee shop, there are over 20 species of trees from six continents.

I felt as if I had acquired a new pair of eyes. Street corners and front yards I’ve walked past hundreds of times suddenly had new meaning. Instead of feeling trapped in my neighborhood because of the pandemic, I saw how expansive it was. Not only did I get the best workout in months from the hills of San Francisco, getting to know my street trees has given me a sense of purpose. Instead of wandering around my neighborhood and letting my worries consume me, I learned to stop and observe. Tall and unwavering, the trees are a reminder to pause and appreciate what’s right in front of me.

And even on Chrome — when beforeinstallprompt is fired, it means the app is installable. But what does it mean when it… doesn’t get fired? Does it mean the app can’t be installed? Or that the app is already installed? And what am I supposed to do with my install button while I wait for the beforeinstallprompt to fire or not fire?

On Windows/Chrome, the beforeinstallprompt will also sometimes be emitted several times per session. And sometimes after the app has been installed. Meaning that by relying on that event, you could ask users to install the app… after they’ve installed it. On iOS/Safari, it never gets triggered at all. So you never even get an opportunity to tell your users your app is installable.

In addition to their beauty, urban trees are also highly functional. They provide habitats for birds, bees, and butterflies, reduce the heat-island effect in the city, help filter stormwater, and improve air quality by storing carbon dioxide. In other words, we couldn’t live without them.

Create a JSON file, call it manifest.json, fill out the fields recommended by Google. Then create a JavaScript file, call it service-worker.js, register it from your client-side code. You’re done. You have a PWA that kinda words. It took you a couple of hours to figure everything out, and 30 minutes to actually write the code. Not bad.

If you think of trees as nothing more than green blurs on the side of the road, here are a few common ones in San Francisco to learn so you can get started on a new-found appreciation:

Or we could also talk about the appinstalled event. It would be really useful if it wasn’t for the fact that this event is never triggered at all on iOS/Safari or Android/Samsung Internet. After the app is installed, you’ll likely want to hide or disable the install button. How do you do that when you’re not even sure the app was installed in the first place?

“San Franciscans enjoy unusual stuff,” says Mike Sullivan, author of The Trees of San Francisco and one of three organizers of the Covid-19 tree tours that first sparked my love for my street’s trees. “People choose to be unusual here. We love diversity in human beings and diversity in our trees.”

Unlike most major cities, San Francisco allows residents to plant their own street trees, resulting in an urban forest as diverse as the people who live here. Though the city’s Mediterranean climate can be hard on trees, nearly 125,000 of them live here with more than 500 species from all over the world.

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ay a game with your friend. You toss a classical six-sided dice, and if the outcome is 1 or 2, you win 300 bucks. Otherwise, you lose 200. What are your average earnings per round if you play this game long enough? Should you be even playing this game?

Right before 2020 turned into a global shitshow, I gathered a couple of friends and together we came up with an idea for a simple little app we thought would be helpful. Humbly called The Coronavirus App, our app ended up being used by more than 15 million people, making it — I believe — one of the most widely used PWAs ever.

Urban tree watching, in addition to the personal and societal benefits it provides, feels surprisingly intimate. I now know that a neighbor is hoping to harvest figs, that another has a garden full of native Californian plants, and yet another has possibly the only bloodwood tree outside of the San Francisco Botanical Garden. Getting to know the trees feels very much like getting to know my neighbors themselves. The plants in their yards offer a glimpse of their likes, dislikes, and the amount of care they dedicate to living beings. In a time when we have to stay apart to keep each other safe, getting to know our neighborhood trees is the perfect reminder that we are all part of something much bigger.

Urban tree watching, in addition to the personal and societal benefits it provides, feels surprisingly intimate. I now know that a neighbor is hoping to harvest figs, that another has a garden full of native Californian plants, and yet another has possibly the only bloodwood tree outside of the San Francisco Botanical Garden. Getting to know the trees feels very much like getting to know my neighbors themselves. The plants in their yards offer a glimpse of their likes, dislikes, and the amount of care they dedicate to living beings. In a time when we have to stay apart to keep each other safe, getting to know our neighborhood trees is the perfect reminder that we are all part of something much bigger.

I love the web. And I love PWAs. What’s not to love, really? With a PWA, you only have one code base to manage. Your app works everywhere. And you don’t have to share 30% of your hard-earned revenue with Apple and Google.

Since stumbling upon a self-guided Covid-19 tree tour organized by Sullivan and fellow tree nerds Jason Dewees and Richard Turner, getting to know my street trees has become a favorite pandemic activity. At first, I followed chalk markings left by the trio on sidewalks, detailing the common and Latin names of those they found noteworthy. Then I ventured out on my own, using Sullivan’s book and the app LeafSnap to identify trees in my neighborhood.