Generate code to embed a diagram in a webpage

You can embed a draw.io diagram into a web page either as native HTML markup (rendered inline by the draw.io viewer script) or as an <iframe> that loads the lightbox. The complete reference — UI walk-throughs for both File → Embed → HTML and File → Embed → IFrame, plus the full list of viewer configuration keys supported in the data-mxgraph JSON — is maintained as a GitHub Discussion: