The dev release seems to have problems with accessing Window:
https://www.youtube.com/s/desktop/6babc418/jsbin/desktop_pol...
desktop_polymer_inlined_html_polymer_flags.js:9964 Uncaught TypeError: Cannot assign to read only property 'process' of object '#<Window>' at desktop_polymer_inlined_html_polymer_flags.js:9964 at desktop_polymer_inlined_html_polymer_flags.js:9972 at desktop_polymer_inlined_html_polymer_flags.js:22336 (anonymous) @ desktop_polymer_inlined_html_polymer_flags.js:9964 (anonymous) @ desktop_polymer_inlined_html_polymer_flags.js:9972 (anonymous) @ desktop_polymer_inlined_html_polymer_flags.js:22336