Lazy Loading Feature Plugin is an official plugin maintained by the WordPress team. It is intended for testing of automatically adding the
loading HTML attribute to images and other elements that support it.
More information about the
HTML Specification: https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading.
loading attribute is supported in the following browsers: https://caniuse.com/#feat=loading-lazy-attr.
To test, install and enable the plugin. It will automatically add
loading="lazy" attributes to all images in all new and existing posts, pages, and text widgets on the front-end.
Then use one of the browsers that support it (Chrome, Opera, Firefox, Edge, Android, etc.) and visit the site. Best would be to test over a slower connection, with a phone, etc. and test web pages that have a lot of images, like gallery posts.
Things to look for
- Obvious bugs, for example images are missing.
- Try to scroll down as soon as the page loads. All images should be at their places, and the page shouldn’t “jump” when images are loaded.
Note to developers
This plugin is intended for testing. If the tests are successful, this functionality will be added to WordPress, but the exact code may change, perhaps significantly.
When testing, please also test the filters added by this plugin, and provide feedback at https://github.com/WordPress/wp-lazy-loading or at https://core.trac.wordpress.org/ticket/44427.
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Add it to WordPress core!
Been using lazy load in WPFC with problems of images displaying properly. This plugin has made all images display correctly and my site is so much faster.
The plugin just adds the loading="lazy" attribute, which works fine, the rest is done by the browsers who support it, which will soon be all relevant ones, since Safari is about to implement this feature. This is a huge improvement for the web platform and web performance in general, I can't even imagine the amount of data (and thus time, energy, CO2, money...) this will save once WP implements it in core.
The lazy loading experience itself is ok - you DO sometimes see images pop up, but that's a price worth paying, and browsers will hopefully improve this by starting the loading at just the right time.
Lazy to do the job.
If HTML validation is important to you, proceed with caution. Online validator at w3c dot org, will throw an error since loading="lacy" isn't standadized (yet?).
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