Google has one again made updates to the QA page content guidelines, this time providing dos and don'ts with more detail. Previously Google added these guidelines in December of last year for the new QA page schema.
The update was spotted by Kenichi Suzuki and posted in Semantic Search Marketing Forums. Aaron Bradely shared the before and after on Twitter:
Old:
New:
Here is how this QA markup may look like in the Google search results:
You can read them over here.
Forum discussion at Semantic Search Marketing Forums and Twitter.