See https://codepen.io/etpinard/pen/BwvENX?editors=0010

Since #1939 released in 1.30.0, Plotly.downloadImage and Plotly.toImage accept {"data":[], "layout":{}} objects as well as graph div as first argument.

So one could extend a graph's data and/or layout before calling Plotly.downloadImage to apply custom download styles to a graph. I don't see the need to add a style option to Plotly.toImage.

Sounds good. A couple of questions:

• does it mean, that arguments list probably won't change and it's ok to use {data, layout, config} ?
• _snapshotInProgress probably won't work. It's possible to update it manually in your app code, but is it ok to use property with underscore, since it supposed to be used internally?

does it mean, that arguments list probably won't change and it's ok to use {data, layout, config} ?

The api is the following, so yes, it isn't the same as newPlot.

_snapshotInProgress probably won't work

I don't know what that is. It's probably always a bad idea to rely on _ properties.

_snapshotInProgress - from plotly.js/src/snapshot/download.js,
true - if snapshotting already in progress, will cancel next download process when first one is not finished
false - if not in progress

It should.

Alright, I'm closing this thing as it won't result in a PR of any sort. Please use https://community.plot.ly/ if you have other questions of the likes.