Online html/css/js code editor (but not simple, but…)?

Question

HTML

Actually the request is in the title, but I have certain requirements :)

• mandatory support for ZenCoding (see emmet.io)
  
• necessarily the ability to work synchronously (pair programming)
  
• obligatory online display of results (in a separate window or with the ability to quickly switch to the result)
  

I know that all this is in codepen.io , but only on paid plans.
Maybe there are free alternatives?

Answer 1

http://cssdeck.com
Pros:
- ZenCoding
- Collaborating/ Teaching (joining to view changes / edit code online)
- Allows unlogged users to join code changes
- Very usable when conducting interviews
Cons:
- Occasionally "freezes" - requires reloading the page .
For example, open several windows with the following link and change something in the code:
http://cssdeck.com/labs/collab/vvk80hyg/0

Answer 2

Offtopic, but on topic.
Tell me, why do they use online editors at all? There are many free, at times powerful editors. Unless of course you have chrome os, or some similar

Answer 3

I also came across http://plnkr.co .
It also has a collaborative mode. Allows you to create separate html, css, js files. And save the edited set as a snippet.
A little more "heavy" than cssdeck. But maybe someone will be useful.
Zencoding works worse in it (at least I didn’t unfold complex structures).

Answer 4

I came across a small review of online editors with descriptions, etc. geek-nose.com/html-redaktor-online-luchshie-instru... Choose to your taste))