I've fixed this in the FAQ:
https://github.com/Polymer/docs/commit/bbf021f13701fd68b110509d4ab3c62c905e5f58

The restrictions I mentioned last Oct. still hold.

On Sun, May 10, 2015 at 7:47 AM <[email protected]> wrote:

> Dear Eric,
>
> What is the current status of this case at May.,2015 ?
>
> Taewon.
>
>
> On Wednesday, October 29, 2014 at 9:24:32 PM UTC-4, Eric Bidelman wrote:
>
>> I believe that's a leftover from an earlier time when we thought this
>> would be the case.
>>
>> HTML Imports follow the same restrictions as XHR:
>>
>> - need to be fetched from http(s). Blink imposes security restrictions on
>> what you can do with file://.
>> - CORs enabled if remote
>>
>> We'll update that language.
>>
> On Tue, Oct 28, 2014 at 5:11 PM, <[email protected]> wrote:
>>
> On the Polymer site under Creating elements there is a note that says
>>>>
>>>> You must run your app from a web server for the HTML Imports
>>>> <https://www.polymer-project.org/platform/html-imports.html> polyfill
>>>> to work properly. This requirement goes away when the API is available
>>>> natively.
>>>
>>>
>>> So lets say for an offline op where I am just opening an html file via
>>> open file or double clicking on it.  The html file is just a simple custom
>>> element that imports polymer.html
>>>
>>> When I run this I get a CORS error
>>>
>>>> Imported resource from origin 'file://' has been blocked from loading
>>>>> by Cross-Origin Resource Sharing policy: Received an invalid response.
>>>>> Origin 'null' is therefore not allowed access. el.html:1
>>>>
>>>> Uncaught ReferenceError: Polymer is not defined
>>>>
>>>>
>>> Is this the correct behavior since it is natively supported now in
>>> latest chrome according to above statement it should work, or is cors
>>> another issue.  I understand CORS and how to handle it when using a web
>>> server but not when just opening an html file via file://
>>>
>>> Thanks,
>>> Dan
>>>
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