l have the same issue - HTML background colours are not rendering on iOS 17 simulator and iOS 16.7 physical device. iOS 14 simulator device the colours render just fine. My coding follows a similar path going from HTML to PDF for printing. Will continue digging for a solution.

If your issue is with HTML colours not rendering, be it the general background, table row or table cell backgrounds - I have just found a solution. https://stackoverflow.com/questions/72507453/printing-from-wkwebview-in-swift-ignores-background/75882507#75882507 Have a look at the answer by ov1d1u Adding this CSS directive to the HTML code fixed it for me: @media print { * { -webkit-print-color-adjust: exact !important; } } Phew, now I can continue.....

So last night I managed to sneak off with my wife's phone, updated it from IOS 16* to IOS 17.5.1 and 'viola', same problem arose, so then I figured it had to be something with the IOS....or not. I drilled down on the NSPredicate again and after some changes the following now works: was: NSPredicate(format: "%K LIKE %@", NSMetadataItemFSNameKey, fileUrl.lastPathComponent) is now: NSPredicate(format: "%K == %@", NSMetadataItemPathKey, fileUrl.relativePath) --And that now works-- Thank you for the link, it gave me the incentive to tinker with the predicate again. The above mentioned error is still present on the device, but I can for the foreseeable future ignore it. And the 'startAccessingSecurityScopedResource()' now returns 'true' Thank you for your assistance.