A couple weeks ago, Martin Splitt from Google announced on Twitter that he and Lizzi Harvey from Google posted a new developer document on the basics of JavaScript and SEO. The guide describes how Google Search processes JavaScript and the best practices for improving JavaScript web apps for Google Search.

The document is broken into these sections:

How Googlebot processes JavaScript
How to describe your page with unique titles and snippets
How to write compatible code
When to use HTTP status codes
How to use meta robots tags
How to fix images and lazy-loaded content

One note from the SEO community:

Forum discussion at Twitter.