If a browser had been tested and found lacking in some type, I'd hope they'd state the feature that they were relying on that was missing or buggy. The verbiage made it sound like Chrome wasn't tested (or they're pretty arrogant in their dismissal), but something like this would be preferable:

"This probably isn't going to work. What do you want to do?"

[Let me try anyway] [Get me a tested browser] [oh, nevermind]

I understand the behavior as it stands for things like banking or medical websites, where real life things of value are at stake and non-experts may use it, but this is demonstrating an experimental widget on a "labs" site, where the whole point is to try out weird new stuff in browsers.

This wouldn't have been so noteworthy, except that Netscape/Mozilla/FF just spent a decades fighting "browser-ism" and even have a bugzilla category for it: (https://bugzilla.mozilla.org/show_bug.cgi?id=407187 as an example)