The demise of Adobe Flash broke the 9/11 web. But it’s just the tip of a bigger issue.

This is an important story — not just because some crucial 9/11 coverage has been lost or even because the demise of Adobe Flash means that parts of the internet are now broken. Rather, it illustrates that the internet is, in many ways, an ephemeral medium, meaning that we simply can’t preserve and archive our history the way we could during the print era.

Clare Duffy and Kerry Flynn report for CNN.com that The Washington Post, ABC News and CNN itself are among the news organizations whose interactive presentations in the aftermath of 9/11 no longer work properly.

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As they recount, Flash was a real advance in the early days of the web, as it was an important step forward for video and interactive graphics. But the late Steve Jobs, criticizing Flash’s security flaws, decreed that Apple’s iPhone and iPad would not run Flash. At that point the platform began to crumble, and Adobe pulled support for it at the end of 2020.

Duffy and Flynn write that some efforts are under way to use Flash emulators in order to bring some old content back to life. Adobe, which is worth $314 billion, ought to spend a few nickels to help with that effort.

More broadly, though, the problem with Flash illustrates how the internet decays over time. Link rot is an ongoing frustration — you link to something, go back a year or five later, and find that the content has moved or been taken down. Publications go out of business, taking their websites with them. Or they change content-management systems, resulting in new URLs for everything.

We’re all grateful for the work that the Internet Archive does in preserving as much as it can. Here, for instance, is the home page of The New York Times on the evening of Sept. 11, 2001.

But what’s available online isn’t nearly as complete as what’s in print. For the moment, at least, we can still go to the library and look at microfilm of print editions for publications that pay little attention to preserving their digital past. It won’t be too many years, though, before digital is all we’ve got.