Theme class 'lead' and 'invert' not working when export to pdf and pptx

[foryoung365]

Version of Marp Tool

marp-vscode 2.6.0

Operating System

Windows

Environment

vs code about:
Version: 1.79.2 (system setup)
Commit: 695af097c7bd098fbf017ce3ac85e09bbc5dda06
Date: 2023-06-14T08:57:04.379Z
Electron: 22.5.7
Chromium: 108.0.5359.215
Node.js: 16.17.1
V8: 10.8.168.25-electron.0
OS: Windows_NT x64 10.0.19045

How to reproduce

---
marp: true
theme: default
class: 
    - lead
    - invert
---

# Use your own theme

===========
save above as test.md, export to pdf or pptx

Expected behavior

work like preview

Actual behavior

Additional information

No response

[yhatt]

I could not reproduce that. A provided Markdown exports the correct output with inverted color scheme, just like this PDF.
(Note: lead class is not supported in default theme, and it is only available in gaia theme)

We need more information to debug. e.g. the output of console in the VS Code's developer tools while exporting

[foryoung365]

here is the output of the dev tools, but it seems eveything is ok.

test.pdf

I also upload the output pdf file, hope this will help.
If any other debug info needed, please let me know.

[foryoung365]

I tried upgrade node.js to v18.16.1, and use marp-cli to convert to pptx directly, and it doesn't work neither.

test.pptx

[yhatt]

How about if specified just a string as class, instead of YAML array?

---
marp: true
theme: default
class: invert
---

# Use your own theme

This expects exactly same result as YAML array version.

[foryoung365]

How about if specified just a string as class, instead of YAML array?

---
marp: true
theme: default
class: invert
---

# Use your own theme

This expects exactly same result as YAML array version.

I have tried this, but it don't work either.
And I also tried exporting to every format marp supported, all of them produce the incorrect result except html.

[yhatt]

Please check whether installing the latest version of Google Chrome. If not, try to export after updating Chrome into 115.

If you had installed very old version of Chrome, slide variants by class might not work while exporting PDF, due to unsupported modern CSS (:where selector is supported in Chrome 88 and later).

[foryoung365]

chrome version is 115.0.5790.170.

[yhatt]

If you were using Chrome Enterprise, some features for printing PDF correctly might be restricted by the enterprise policy. For example, if PrintingAllowedBackgroundGraphicsModes policy is set as "disabled", PDF may not reproduce the expected color in the slide.

You can check whether managed by the enterprise in chrome://management, and can peek the current policy in chrome://policy. You may have to request to change policy into your administrator as needed.

[foryoung365]

It seems like there is no activated policy in chrome://policy/.