# Feature request - specify Plotly version when using embed codes

When using the Plotly.js API, it is possible to specify the version of Plotly.js required in the script tags in the header of the webpage.

When using plain <iframe embed codes, however, it appears that the latest Plotly renderer is used by default.

It would be useful to be able to specify a known stable release of the Plotly engine when using <iframe embed codes, so that we can be confident that our charts will persist in the state that we initially set them regardless of updates to the Plotly code.