Markdown quote requires blank line to end quote

[sam (Sam Saffron)]

The behavior of:

This is a quote

and line directly below

Is now accepted by the spec:

> This is a quote
>
and line directly below

Time to celebrate with some

CommonMark testing started here!

Per our migration plans, I just enabled markdown.it at Meta. It is an excellent CommonMark compliant engine. I expect quite a few edges to be found during this period of testing. Do not open bugs about the new Engine, just reply here. I/we will be updating the top post here with the list of issues and striking out stuff as it is fixed. Current known issues (to be fixed) Onebox vanishes after you start typing and works not-super consistently pendin…