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The first sentence of the article reads: "I did not set out to build tiny progressive web apps."

For the last line, you could have said IABYUT.

Progressive Web Applications

(It means web pages that use JavaScript to gain access to some “app” features, like offline-functionality and the device sensors as shown in the blog post.)

You wouldn't introduce the acronym "omg" since what it stands for is so well known. I'd argue the same is true in this scenario.

What does PWA mean? After reading some comments I guess personal web apps but I not sure.

Googling "PWA" answers your question right away.

Progressive web app. They're kind of like JavaScript-driven websites that think they're native apps. They tend to be characterised by their use of modern web standards to do some useful things, like being available offline, and caching everything heavily to cut down load time. It's like a website you can install, basically.

PWA is not an acronym. It's an initialism.

I'll say it again for the people in the back.

PWA is not an acronym. It's an initialism.