The code for writing is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp/js/diagramly/EditorUi.js#L8702 https://github.com/jgraph/drawio/blob/

The code for writing is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp/js/diagramly/EditorUi.js#L8702 https://github.com/jgraph/drawio/blob/master/src/main/webapp... Reading is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp/js/diagramly/Editor.js#L568 https://github.com/jgraph/drawio/blob/master/src/main/webapp... We're using the tEXt chunk.