NEW 245411
Multiple picture sources downloading when page is served as XHTML 
https://bugs.webkit.org/show_bug.cgi?id=245411
Summary Multiple picture sources downloading when page is served as XHTML
Robin Whittleton
Reported 2022-09-19 23:18:10 PDT
Created attachment 462466 [details] XHTML variant that demonstrates the problem First up, this is quite possibly a dupe of bug #159484, but as the trigger is different I’ll start with filing this issue separately. Given a page with a picture element with a source element that references a different resource to the img element, both referenced resources will be downloaded if the page is served as an XHTML document with the appropriate xmlns. I’ve attached a couple of test files that demonstrate the problem. This was observed in the wild on https://standardebooks.org/ebooks, which doesn’t contain any JS (trigger from bug #159484) and is served as XHTML.
Attachments
XHTML variant that demonstrates the problem (209 bytes, application/xhtml+xml)
2022-09-19 23:18 PDT, Robin Whittleton 		no flags
Details
HTML variant that works correctly (178 bytes, text/html)
2022-09-19 23:18 PDT, Robin Whittleton 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Robin Whittleton
Comment 1 2022-09-19 23:18:29 PDT
Created attachment 462467 [details] HTML variant that works correctly
Ahmad Saleem
Comment 2 2022-09-23 13:23:32 PDT
Only difference I can find between these two test is: <html xmlns="http://www.w3.org/1999/xhtml"> vs <html> and both have issues while pasting the code in W3C validator: https://validator.w3.org/#validate_by_input - Can you share an example with working images in it and reproducible test case in both cases, I don't get any difference. Thanks!
Alexey Proskuryakov
Comment 3 2022-09-24 16:18:39 PDT
What's important here is that the attachments are served with different content types. application/xhtml+xml means that the document is handled as XHTML. To see the problem, one needs to check errors in Web Inspector. One subresource loading error means passing; two errors means failing. This does reproduce.
Ahmad Saleem
Comment 4 2022-09-24 16:20:10 PDT
(In reply to Alexey Proskuryakov from comment #3) > What's important here is that the attachments are served with different > content types. application/xhtml+xml means that the document is handled as > XHTML. > > To see the problem, one needs to check errors in Web Inspector. One > subresource loading error means passing; two errors means failing. This does > reproduce. Thanks for your input.. New learning for me. Will account for in future testing. :-)
Radar WebKit Bug Importer
Comment 5 2022-09-26 23:19:18 PDT
<rdar://problem/100444926>
Robin Whittleton
Comment 6 2022-09-26 23:25:43 PDT
Note: standardebooks.org (referenced in the original comment) has now been adjusted to not serve any source elements to Safari, effectively bypassing this problem. The bug still stands with the testcases.
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