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* Add `defer` loading strategy for all frontend end-user theme scripts (excluding Customizer preview). * Move scripts to the `head` which relate to the initial page viewport to ensure they start loading earlier and execute sooner while still not blocking rendering. * Update Twenty Twenty's script loader (`TwentyTwenty_Script_Loader`) to support core's built-in script loading strategies (#12009), while also retaining backwards-compatibility for child themes that may set `async` and `defer` script data. * Update the main script loading strategy in Twenty Twenty from `async` to `defer` for better performance on repeat page views, since when an `async` script is cached it will block rendering. Props westonruter, flixos90, sabernhardt. Fixes #59316. Built from https://develop.svn.wordpress.org/trunk@56556 git-svn-id: http://core.svn.wordpress.org/trunk@56068 1a063a9b-81f0-0310-95a4-ce76da25c4cd |
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