[Webkit-unassigned] [Bug 224547] New: Images and iframes with attribute loading=lazy do not print if not viewed (scrolled to) first

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224547

            Bug ID: 224547
           Summary: Images and iframes with attribute loading=lazy do not
                    print if not viewed (scrolled to) first
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: groek_de_bc at outlook.com

* SUMMARY
Lazy loaded images and iframes that have not been on screen yet, are not loaded when printing, producing empty elements.

* STEPS TO REPRODUCE
1. Open Safari/WebKit.
2. Enable lazy loading of images in the Experimental features.
3. Visit a page that contains lazy loaded images or iframes that are not visible on page load (i.e. below the fold).
4. Print the page

* EXPECTED RESULTS
All images should be visible in the printed version

* ACTUAL RESULTS
Only images that were already loaded before executing the print command are visible. 

* REGRESSION
I think this never worked.

* TEST CASE
https://www.ecb.europa.eu/lazy-loading-test/

Printing this page should show the numbers 1 through 6. 

* RELATED LINKS
https://github.com/whatwg/html/issues/6581

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