Bisected to https://chromium.googlesource.com/chromium/src/+/a664cb352ef4e15f7e02ddfe2caae2c6d243a343 "Unprefix CSS user-select property"

Thanks Alex to track this down.

It looks like we're the first browser in the world to support CSS "user-select: all" and it's behaving as specced (https://developer.mozilla.org/en-US/docs/Web/CSS/user-select).  CNBC for some reason has put in their CSS as a no-op property, now no longer no-op.  I don't think there's anything to do on our end, they just need to remove the bogus value from their CSS.

I filled in a feedback form on their website with:
"Your website is broken on Chrome Beta 54.0.2840.41.  When you click anywhere on an empty region, the entire page becomes selected blue.

The problem is the incorrect CSS property "user-select: all".  Please tell your webmaster team to remove this property.  It used to do nothing, but in newer versions of Chrome it (correctly) causes the page to become selected on click.  See https://www.chromestatus.com/feature/5722186220306432 and  http://crbug.com/653729 "

If they don't take action, I think we can probably just go to stable channel as scheduled and they'll fix it within hours.  There's ultimately no other way to unprefix things.  I haven't seen this elsewhere on the web yet.

Looks like they switched over their CSS to "user-select: text", I can no longer repro on Mac M54 or M55.

Thanks Alex to reach the developer.