WordPress 4.5 Beta 1 is now available!

This software is still in development, so we don’t recommend you run it on a production site. Consider setting up a test site just to play with the new version. To test WordPress 4.5, try the WordPress Beta Tester plugin (you’ll want “bleeding edge nightlies”). Or you can download the beta here (zip).

WordPress 4.5 is slated for release on April 12, but to get there, we need your help testing what we have been working on, including:

There have been changes for developers to explore as well:

Selective Refresh (#27355) – A comprehensive framework for rendering parts of the customizer preview in real time. Theme and plugin authors should test their widgets specifically for compatibility with selective refresh, and note that it may ultimately be opt-in for 4.5.

(#27355) – A comprehensive framework for rendering parts of the customizer preview in real time. Theme and plugin authors should test their widgets specifically for compatibility with selective refresh, and note that it may ultimately be opt-in for 4.5. Backbone and Underscore updated to latest versions (#34350) – Backbone is upgraded from 1.1.2 to 1.2.3 and Underscore is upgraded from 1.6.0 to 1.8.3. See the this post for important changes.

(#34350) – Backbone is upgraded from 1.1.2 to 1.2.3 and Underscore is upgraded from 1.6.0 to 1.8.3. See the this post for important changes. Embed templates (#34561) – Embed templates were split into parts and can now be directly overridden by themes via the template hierarchy.

(#34561) – Embed templates were split into parts and can now be directly overridden by themes via the template hierarchy. New WP_Site class (#32450) – More object-oriented approach for managing sites in Multisite

(#32450) – More object-oriented approach for managing sites in Multisite Script loader (#14853, #35873) – Introduces wp_add_inline_script() for including inline JavaScript just like wp_add_inline_style() works for CSS, and better support for script header/footer dependencies.

If you want a more in-depth view of what major changes have made it into 4.5, check out all 4.5-tagged posts on the main development blog, or check out a list of everything that’s changed.

If you think you’ve found a bug, you can post to the Alpha/Beta area in the support forums. We’d love to hear from you! If you’re comfortable writing a reproducible bug report, file one on the WordPress Trac. There, you can also find a list of known bugs.

Happy testing!

A wonderful day

is one that brings new WordPress

Four Five Beta One

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