Double quotes don't work in polyfill-next-selector content

[JanMiksovsky]

See http://jsbin.com/gacogeda/12/edit. This doesn't work as expected in polyfilled browsers; the polyfill-next-selector line never gets applied.

If the line

      polyfill-next-selector { content: ":host span"; }

is changed to

      polyfill-next-selector { content: ':host span'; }

then the polyfill directive works.

Generally, it looks like Polymer doesn't like double quotes for strings in CSS rules. E.g., pseudo-selectors like ::before and ::after can normally have content specified with double-quoted strings, but this doesn't seem to work either in a polymer-element's <style> tag.

[sorvell]

This should work now and the polyfill-next-selector should not be necessary. Under the polyfill ::content is just removed. The polyfill-next-selector rule is needed only when additional scoping is required.

http://jsbin.com/puxepaqetuce/1/edit