Is Polymer SEO friendly? [closed]
This question has bothered me also. The polymer team has this to say about it, looks promising!
UPDATE
Also figure it's worth adding some context from the conversation on the polymer list, with some helpful information as to the status from Eric Bidelman.
Initial examination of the structure of the Polymer site suggests that it serving up static content with shadow-DOM content already inlined in the page. Each HTML file can be loaded from the server directly, via HTTP GET, and subsequent navigation uses pushState (documentation) to inject pages into the current DOM if pushState and JavaScript is supported.
It's recommended to use pushState over _escaped_fragment_, since it's slightly less messy, but you'll still need to do regular templating on the server. See The Moz Blog for more information on this.
DISCLAIMER
I may have missed or misinterpreted some things here, and this is just a quick peek at the guts of the page, but hopefully this helps.