Hi everyone. I faced the same kind of trouble and applied similar Hoa's 
WORKAROUND but in <Platform.js> this time:

*            scopeRules: function(a, b, c) {      */* line 3403  ::  file 
<Platform.js> here enclosed */
*                var d = "";*
*if (a == null) {*     /* patch suggested by Hugo, according to Hoa's 
workaround */
                    * return d*
* }*
*                return Array.prototype.forEach.call(a, function(a) {*

Execution now runs successful as "proved" by 
*http://hugo.machefer.free.fr/map4/web-components/map.html. *
JS instantiations *twice *were removed (not responsible for this issue, but 
*cleaned*, for the sake of sanity of course)

-- hmachefe

Le vendredi 17 janvier 2014 23:02:08 UTC+1, [email protected] a écrit :
>
> I have downloaded 
> *https://github.com/scopyleft/web-components/blob/master/map.html 
> <https://github.com/scopyleft/web-components/blob/master/map.html>* and 
> placed it there *http://hoteliris.fr/map3/web-components/map.html 
> <http://hoteliris.fr/map3/web-components/map.html>* just for fun, 
> exploration purpose.However, for some, it fails by Chromium running on my 
> Windows 7 platform : 
>
> TypeError
>  "TypeError: Array.prototype.forEach called on null or undefined
>     at forEach (native)
>     at Object.i.scopeRules (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11510)
>     at Object.<anonymous> (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11736)
>     at CSSRuleList.forEach (native)
>     at Object.i.scopeRules (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11510)
>     at Object.i.convertScopedStyles (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:10967)
>     at Object.i.shimScoping (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:10700)
>     at Object.i.stylesToShimmedCssText (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:8281)
>     at Object.i.shimStyling (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:7928)
>     at f.desugar (
> http://hoteliris.fr/map3/web-components/polymer/polymer.js:29:18243)"
>     at forEach (native)
>     at Object.i.scopeRules (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11510)
>     at Object.<anonymous> (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11736)
>     at CSSRuleList.forEach (native)
>     at Object.i.scopeRules (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:11510)
>     at Object.i.convertScopedStyles (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:10967)
>     at Object.i.shimScoping (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:10700)
>     at Object.i.stylesToShimmedCssText (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:8281)
>     at Object.i.shimStyling (
> http://hoteliris.fr/map3/web-components/polymer/Platform.js:31:7928)
>     at f.desugar (
> http://hoteliris.fr/map3/web-components/polymer/polymer.js:29:18243)" 
>
> NOTE : I use Chromium 33.0.1724.0 (Developer Build 237962). I haven't 
> enabled anything special by chrome://flags
> Thanks in advance for your help.
>
> /* Urbain */
>

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