how to add attribute like author info to all dom input?

[hakonleung]

I have wrote a cooperation editor based on quilljs.
Now I need to add author attribute when I type in editor div, how can i achieve it?
I type a 'a', text-change event`s argument delta like:
{
insert: 'a',
attribute:{
author: someVariable
}
}

[benbro]

Starting point:
#1049

[hakonleung]

thx @benbro, i have made it.