Recognizing all of the ways our carefully-crafted experiences can be rendered unusable can be more than a little disheartening. No one likes to spend their time thinking about failure. So don’t. Don’t focus on all of the bad things you can’t control. Focus on what you can control.
Start simply. Code defensively. User-test the heck out of it. Recognize the chaos. Embrace it. And build resilient web experiences that will work no matter what the internet throws at them.