UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Steps to reproduce the problem:
1. browse to a web app that uses a manifest for offline functionality
2. open dev tools and right click the refresh page button
3. select the option 'empty cache and hard reload'
4. optional; check progress of manifest files loading in the console 

What is the expected behavior?
no 'Application Cache Checking event' and 'Application Cache NoUpdate event' in the console. All files in the manifest will be loaded from the server

What went wrong?
'Application Cache Checking event' and 'Application Cache NoUpdate event' in the console. No files are being loaded from the server

Did this work before? Yes 60

Chrome version: 61.0.3163.100  Channel: stable
OS Version: OS X 10.12.6
Flash Version: 

current workaround is to manually delete the manifest through the chrome://appcache-internals/# page.
If above behaviour is intended can there please be an option in the dev tools to 'disable cache including manifest'?