External link is shown with black background when exporting a page

[kelson42]

@HiroyasuNishiyama cloned issue kiwix/kiwix-apple#973 on 2024-09-09:

External link is shown with black background when exporting or printing a page as shown below.

[kelson42]

@kelson42 commented on 2024-09-09:

@BPerlakiH Is that a problem with the content itself?

[kelson42]

@BPerlakiH commented on 2024-09-09:

@HiroyasuNishiyama Thank you for reporting this!

@kelson42 it does seems to be a content issue, there are some strange background properties set in css for the external link:

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when I disabled them, the PDF looks good:

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Also on non wiki content, the external links looks OK:

[kelson42]

@HiroyasuNishiyama commented on 2024-09-10:

@BPerlakiH That CSS appears to be checking for SVG support and falling back to PNG.　Please look at here.

In my opinion, this seems to be a bug of WKWebView.

[kelson42]

@BPerlakiH commented on 2024-09-13:

I did some further investigation on this, and force-loaded the current Wikipedia content into the app (not from a ZIM file), and exported that to PDF, and that looks good. So I think it is purely a content issue:

[kelson42]

@kelson42 commented on 2024-09-18:

I will move the issue to openzim/mwoffliner

[benoit74]

@HiroyasuNishiyama please provide details about which ZIM and which path / article we are dealing with, otherwise I'm concerned we are not looking at the same thing.

Your device is configured to use dark mode by default, correct?

[HiroyasuNishiyama]

@benoit74 It has been quite a while since I reported this issue, so I don’t remember which ZIM file or article I was using at the time. I believe the issue occurs with any ZIM file or article.

For example, I just tried it now on the "Kixix" page of "Computer by Wikipedia" ZIM file, and the same phenomenon occurred.

Regarding the device, as you pointed out, I am using dark mode.

[benoit74]

Thank you @HiroyasuNishiyama for this valuable information.

I confirm that:

• I see same behavior on my Mac in dark mode on Kiwix page of wikipedia_en_computer_nopic_2025-05
• Issue is gone with 1.15-dev0 and ActionParse API

This means that issue will be gone once we've released 1.15 and switched to ActionParse API (if we confirm the move).