polydev is the Polymer DevTools Extension - a tool to help develop Polymer and custom elements.

The release version of polydev is available on the Chrome Web Store:

https://chrome.google.com/webstore/detail/polymer-devtools-extensio/mmpfaamodhhlbadloaibpocmcomledcg

polydev must be built before running. The build step externalizes inline scripts for CSP compliance, and copies some dependencies into convenient locations.

To build, run npm run build:

> npm run build 

The built project is available at build/polydev.

1. Create a new Chrome profile
2. Navigate to chrome://extensions
3. Check the "Developer mode" checkbox
4. Click "Load unpacked extension..."
5. Choose /polydev/build/polydev

When changing files in src/ the dev workflow should work cover most use cases.

> npm run dev 

Depending on the change you can either then close and reopen the devtools, or if you've made a change to the content-script or to element-zones, you must reload both the extension and any page you're testing it on.