paper-ckeckbox and other elements 3.0.0-pre.3 error

[margotpuyjalon]

paper-checkbox-test-directory.zip

Description

When I try to use paper-checkbox element v.3.0.0-pre.3 in my app, the console log "Uncaught ReferenceError: Polymer is not defined at paper-ripple.js:289".

Tested directly as web component in html page and embeded in another custom Polymer element.

Expected outcome

I expected that a paper-checkbox element displays on the screen.

Actual outcome

The console log an error : "Uncaught ReferenceError: Polymer is not defined
at paper-ripple.js:289"

Steps to reproduce

1. create a polymer app with "yarn init" and add "flat: true" to package.json
2. add the polymer-cli "yarn add --dev polymer-cli"
3. "yarn add --dev polymer/polymer@next"
4. "yarn add --dev webcomponents/webcomponentsjs"
5. "yarn add polymer/paper-checkbox@next"
6. import paper-checkbox element in my index HTML
7. insert paper-checkbox tag in my body tag
8. "polymer serve --npm --open"

Browsers Affected

• Chrome Beta with error : Polymer is not defined
• Chrome with error : TypeError: Cannot read property 'html' of undefined at paper-ripple.js:257
• Firefox with error : TypeError: Polymer is undefined

Didn't test on Safari, Edge or IE.

Operating System

CentOS Linux release 7.3.1611 (Core)
Linux xxxxxx 3.10.0-514.el7.x86_64 #1 SMP x86_64 x86_64 x86_64 GNU/Linux

Thanks for your attention.

Regards.

Margot PUYJALON.