bug
https://material.angular.io works properly.
white screen with some 404 in console.
I have checked disable cache in chrome devtools network tab, and refreshes many times.

https://material.angular.io/runtime.a66f828dca56eeb90e02.js
https://material.angular.io/styles.dac3a9e03d9660e0b6fe.css
https://material.angular.io/main.33d6b00ba0e5df97cddb.js
after clean all site data in Application tab. it go back works.
but I have meet many times like that. so I think this should be an issue.
Have you tried force-reloading? (aka Ctrl + F5 / Ctrl + Shift + R)
Hard reload fixes it but if users have to do that to be able to use the website, maybe there is something wrong with website's caching policies/response headers?
@amcdnl can you take another look at the service worker setup?
@jelbourn - I made a PR that tweaks the SW settings and bumps pkg to latest ( https://github.com/angular/material.angular.io/pull/485 ). At this point, SW are causing more issues than they might be worth. Might be worth considering removing them.
To make material.angular.io work temporarily on chrome (for end user) select Bypass for network option under chrome developer tools >> Application >> Service workers

This should be resolved now; it might need one final service worker clear.
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Most helpful comment
Hard reload fixes it but if users have to do that to be able to use the website, maybe there is something wrong with website's caching policies/response headers?