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if statement is missing brackets ( else has it) and the function useComponentModelPolyfill("x-chart", "Chart"); while innocuous might be assumed by n00b readers to be an interface provided by browsers. The example could simply get by with a // enter polyfilling function here or something similar.
Thanks, great suggestion! http://dvcs.w3.org/hg/webcomponents/rev/6c6d7752ce31