Does Yandex SPA index on Polymer?

Question

Search Engine Optimization

Who solves SEO tasks for SPA on Polymer (not only for Google)?
For Facebook, meta tag values ​​like those already rendered for the page should come.

Answer 1

Yes.
Both Google and Yandex (and other search engines) have long been taking the page through JS-crawler and parsing the DOM on the DOM Ready event before indexing.
It has become much more important to observe valid markup! Because due to incorrect markup, the page may not be indexed or may be processed incorrectly.