> and you have to make sure to get every detail right or you’re back to the uncanny valley of SPA web pages You can’t get every detail right, because the brows

> and you have to make sure to get every detail right or you’re back to the uncanny valley of SPA web pages You can’t get every detail right, because the browser doesn’t expose some of the pieces that would be required to do so—even apart from details that vary between browsers. The most obvious example of unexposed functionality is the loading indicator, but there are more around things like slow or failing networks.