Since you mentioned dark mode in the article, here are some ideas: https://github.com/jgraph/drawio-github/blob/master/DARK-MOD...
As David mentioned, check out the desktop app for local device storage at https://get.draw.io
The code for writing is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp... Reading is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp... We're using the tEXt chunk.
Since you mentioned dark mode in the article, here are some ideas: https://github.com/jgraph/drawio-github/blob/master/DARK-MOD...
As David mentioned, check out the desktop app for local device storage at https://get.draw.io
The code for writing is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp... Reading is here: https://github.com/jgraph/drawio/blob/master/src/main/webapp... We're using the tEXt chunk.