I've been working with Quill for a short time and have been focused on getting collaborative editing working. So far it's going well and I have a fully working collaborative editor!
I want to show the selection and cursor position of other users, but I can't think how to properly approach this problem with Quill.
I essentially want to add markup to the rendered document, without adding any content to the actual document model. Is this possible? Where should I start?
In Quill 0.20, there was an example with multiple cursors working. The approach was a sibling absolutely positioned <div> that contained the cursors and synchronized with selection-change information from the editor. To not delay the 1.0 release this demo and feature was not updated with the new API but support is planned. You can try a similar approach in the meantime and of course the code is still available. You can also track the feature on Github Issues.