Last week the feature plugin decision deadline closed and WordPress core contributors approved Responsive Preview and Selective Refresh for merge. The merge deadline is Wednesday, February 17, followed by the first beta next week. Both feature approved for 4.5 extend the customizer to improve live previews. A new version of the Customize Partial Refresh plugin is now available and ready for testing. This new feature makes previews more instant using JavaScript, as opposed to reloading the entire preview for each setting change. Developers who build customizer settings will be able to use a postMessage transport, which is much faster than the default refresh transport. The plugin’s description page includes a video demonstrating the faster previews with an example of adding smilies to the site title. According to the meeting summary written by 4.5 release deputy Adam Silverstein, the most important question to answer is whether widgets should opt-in for selective refresh by default. Weston Ruter recommended that they require opt-in for widget selective refresh in 4.5 and warn developers that it will be set to default in the next release. The new responsive preview feature is part of
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