303995 2025-12-11 07:48:05 -0800 Implement HTML video and audio element lazy-loading via the loading attribute 2026-03-13 07:45:34 -0700 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified NEW InRadar, Performance P2 Enhancement --- 1 sjehl webkit-unassigned jer.noble webkit-bug-importer oldest_to_newest 2165103 0 sjehl 2025-12-11 07:48:05 -0800 This is a request to add support for the loading attribute for HTML video elements, which would facilitate lazy-loading for video. The loading attribute for video would use similar conventions to img and iframe, where the attribute has precedent, and provides performance benefits. It would have possible values of eager and lazy. When the loading attribute value is lazy, loading of any video or poster image data, as well as autoplay playback, must defer until layout is known and the video is in the viewport. As an aside, we are interested in helping implement a patch for this. Related links: - HTML Standard Spec Change Proposal https://github.com/whatwg/html/pull/11980 - Github Issue https://github.com/whatwg/html/issues/10376 - Mozilla Standards Position: Positive https://github.com/mozilla/standards-positions/issues/1325 - Webkit Standards Position: Pending https://github.com/WebKit/standards-positions/issues/586 - Corresponding Gecko Bug Tracker: https://bugzilla.mozilla.org/show_bug.cgi?id=2005072 2166958 1 webkit-bug-importer 2025-12-18 07:49:13 -0800 <rdar://problem/166791801> 2174580 2 sjehl 2026-01-23 13:25:08 -0800 Proposal now updated to include audio elements https://github.com/whatwg/html/pull/11980 2178930 3 cduarte 2026-02-06 14:58:41 -0800 Pull request: https://github.com/Squarespace/WebKit/pull/29 2178941 4 cduarte 2026-02-06 15:32:08 -0800 Pull request: https://github.com/WebKit/WebKit/pull/58084 2179443 5 cduarte 2026-02-09 07:21:33 -0800 Pull request: https://github.com/WebKit/WebKit/pull/58207 2179450 6 cduarte 2026-02-09 07:54:41 -0800 Pull request: https://github.com/WebKit/WebKit/pull/58208 2190017 7 sjehl 2026-03-13 07:45:34 -0700 Some updates: The PR links above are incorrect. Latest Webkit implementation PR is here https://github.com/WebKit/WebKit/pull/58220 Webkit Standards Position is marked Positive and will close with that status on March 19 https://github.com/WebKit/standards-positions/issues/586#issuecomment-4048602778 HTML Spec PR is stage 3 and approved https://github.com/whatwg/html/pull/11980