dschuyler@ Will you be able automate the test to avoid regressions in future?

#1 I've been kicking around ideas. Doing a 100% job of it doesn't look practical. And we're not able to easily do this kind of test afaik. One of the main sticking points is having some way to generate every webui page/route during testing.

crbug 747137 would also benefit from a way to iterate through webui pages. As would automated a11y testing; and some issues with i18n.

While there's not an easy solution right off, I think it's important to improve the automation of testing in these areas. 

(To be clear, it might not be too hard to test this one dialog to avoid regression on this one dialog, but imo that's not a good exchange of time for value -- e.g. I'd rather get a 1:1000 (which may be possible) than a 1:1 effort-to-value exchange).

Per C#2, is it fine to remove the blocker label here?

#4 I think so.

I'm not sure if there is much to do here outside validating all the HTML? Closing this as WontFix.