Lazy-loading of images is in core

As planned, the patchpatch A special text file that describes changes to code, by identifying the files and lines which are added, removed, and altered. It may also be referred to as a diff. A patch can be applied to a codebase for testing. for adding loading attribute to img tags is now committed to coreCore Core is the set of software required to run WordPress. The Core Development Team builds WordPress. (see #44427).

Based on preliminary testing there seem to be no conflicts with most plugins that implement lazy-loading for images. Nevertheless the authors of these plugins are strongly advised to test them in trunktrunk A directory in Subversion containing the latest development code in preparation for the next major release cycle. If you are running "trunk", then you are on the latest revision. (WordPress 5.5-alpha) and confirm their plugins work as expected.

It would also be very beneficial to the users if the plugins that implement lazy-loading are updated to utilize the new Core functionality and filters, and to use the new loading HTMLHTML HyperText Markup Language. The semantic scripting language primarily used for outputting content in web browsers. attribute. Please see and

A dev notedev note Each important change in WordPress Core is documented in a developers note, (usually called dev note). Good dev notes generally include: a description of the change; the decision that led to this change a description of how developers are supposed to work with that change. Dev notes are published on Make/Core blog during the beta phase of WordPress release cycle. Publishing dev notes is particularly important when plugin/theme authors and WordPress developers need to be aware of those changes.In general, all dev notes are compiled into a Field Guide at the beginning of the release candidate phase. with more details on the implementation and how to customize the behavior will be published closer to the WordPress 5.5 release.