Can't access Craft CMS admin in Chrome Canary 63.0.3233.0
Context: https://ma.ttias.be/chrome-force-dev-domains-https-via-preloaded-hsts/

The gist is that Chrome is forcing all .dev domains to use https (SSL) via HSTS.

If you want to continue to use a .dev domain, then you'll need to create a valid self-signed SSL cert and make sure OpenSSL is configured properly on your box.

Alternatively, you can swap to using something like craft.test because .test is reserved to never be used as an official top level domain. https://en.wikipedia.org/wiki/.test