Generated PPTX is creating Master Slides, not Slides (as I was hoping) about marp-cli HOT 2 CLOSED

PPTX export is essentially the feature of Marp CLI. I've translated issue from Marp for VS Code ➡️ Marp CLI 🚚

1. It is caused by restriction from using JS library (PptxGenJS). The rendered slide will set as background image. It's the same approach with GitPitch (Try to open sample slide deck), and better for annotatation in presentation tools. But PptxGenJS has not supported setting per slide background images. Creating a lot of master slides is the only way, and we had no choice at this time.

2. Marp focuses to keep beautiful looking slides regardless of the kind of conversion. Rendering images is the best way for that. Creating editable PPTX is very hard because it's like re-creation of HTML rendering engine. Perhaps it would be much larger project than Marp.

If you want editable PPTX, we recommend to convert exported PDF into PPTX by Adobe Acrobat. However, I suppose the reproducibility of output is not good even if this. (different fonts, incorrect shadow rendering, etc...)

Current PPTX generation (Not editable / Perfect reproducibility)	PDF -> PPTX by Adobe Acrobat (Editable / Incorrect renderings)

In short, now the editable PPTX with quality that Marp required cannot generate in any way. I'd like you to think it's the result after doing the best for PPTX generation.

from marp-cli.

1 was improved by working in #205. A single master slide would be applied to PPTX creation in the future release.

from marp-cli.