[Webkit-unassigned] [Bug 231894] New: Allow for different lazy loading policies on responsive image sources.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231894

            Bug ID: 231894
           Summary: Allow for different lazy loading policies on
                    responsive image sources.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: patmeenan at gmail.com
                CC: sabouhallawa at apple.com

Currently lazy loading is applied to the <img> element, even when there are multiple <source> tags for the same image within a <picture>.

For a responsive site that may have different images in the viewport based on layout (mobile vertical scroll vs desktop grid for example), a developer will need to decide which layout to optimize for and potentially slow down the performance of the other layouts.

A possible solution would be to have a given <source> to have a loading attribute that would override the lazy loading state of the <img> that it is associated with.

This is an extension of the original lazyload support: https://bugs.webkit.org/show_bug.cgi?id=200764

whatwg issue: https://github.com/whatwg/html/issues/7227

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