Now with web editor working fine, I think that is necessary to set configurations by default or defined by user for better experience with web editor.

On PHP, javascript and I think that Go (@unknwon talk me if I'm wrong) we prefer 4 spaces indentation.
However, HTML and CSS developers normally prefer 2 spaces indentation. Have cases on other developers prefer tabulation instead spaces.

Because this I think that web editor can be configurable, one good example for this is on Bitbucket, you can set options in own editor.

Or this configuration can be defined on user settings on only on admin area.

What you think guys?

Reference: #3460 (comment)