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Version 3.9

On April 16, 2014, WordPress Version 3.9, named for jazz musician Jimmy Smith, was released to the public. For more information on this enhancement and bug-fix release, read the WordPress Blog, and see the Changelog for 3.9.

For Version 3.9, the database version (db_version in wp_options) changed to 27916, and the Trac revision was 28154.

View Closed Tickets

Highlights

A smoother media editing experience
- Improved visual editing – speed, accessibility, and mobile support
- Edit images easily – quicker access to crop and rotation tools, scale images directly in the editor
- Drag and drop your images right onto the editor
- Image gallery previews right in the editor
- Showcase music and clips with simple audio and video playlists
- Live widget and header image previews in the Customizer
- Stunning new theme browser
For Developers
- Themes can now use HTML5 markup for captions and galleries
- Inline code documentation for action and filter hooks, and media manager and customizer APIs
- External libraries have been updated
- Improved database layer
- New utility functions

What’s New

General

The “update” message has been restored to the dashboard

Posts

Add “Return to post editor” link from Revisions screen
A “View Post” link will now show for any post an author can read
Distraction Free Writing mode is now responsive to any size device

Media

Edit images from the Add Media modal
Improvements to the “Attach Media” pop-up interface
Better support for auto-playing videos
Drag and Drop files into the editor
Full-screen Drag and Drop zone in Distraction Free Writing
oEmbed support added for imgur and meetup.com

Comments

Small improvements to comment administration screens, link colors, language tweaks

Appearance

Widget Customizer management
Upload header images with cropping in the Customizer
Improved theme install workflow

Users

Admin auto-complete improvements
Make sure the “Send this password to the new user by email” toggle option value is remembered

Accessibility

Improved focus styles for form elements throughout the admin
Keyboard accessibility added for theme install screen and theme action buttons

Install Process

Make it easier to customize the install process
Passwords with apostrophes are no longer allowed on installation

Multisite

Add autocomplete for the admin email account to the “new site” form

Under The Hood

General

Add ability to output galleries as HTML5
Introduce doing_filter() and doing_action() to identify hooks in progress
Introduce .dashicons-before class to make it easier to use a Dashicon before an element
Add ability to symlink plugins
The core colors.css file was merged into wp-admin.css, resulting in 1,065 fewer lines of admin CSS
Dashicons updated to latest. Adds line break, paragraph, code, and bbPress.
Add a TTL to core update checks to allow narrowing of the 12-hour update window
The ‘role’ attribute is now allowed in kses for all elements
Rewrite endpoints can now specify a query variable name

JavaScript

Autosave JS has been refactored to use the Heartbeat API
Heartbeat: Hooks will now always receive unslashed data
Options passed to Backbone.View’s constructor are no longer attached automatically. wp.Backbone.View now handles this
Big improvements to documentation of Backbone media-views
Updated media-views and wp.Backbone.View for Backbone 1.1
Masonry has a new script handle, ‘masonry’, and no longer depends on jQuery

Bug Fixes

wp_auth_check now runs properly on every Heartbeat tick
Post/page items are now removed from nav menus when the post/page is deleted
Ensure the $path is trailing-slashed in domain_exists()
Fix bulk activation of network-only plugins
Texturize: Massive performance improvements (~600% faster); better handling of braces, nbsp, double, and weird spaces