There are also semantic differences. In Quill, both list and heading styles are treated as block styles. This means applying "heading" style to a list item removes the item from the list. In Notus, heading style is handled separately from block styles like lists and quotes. As a consequence you can have a heading line inside of a quote block. This is intentional and inspired by how Markdown handles such scenarios. In fact, Notus format tries to follow Markdown semantics as close as possible.