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Ignore:
Timestamp:
09/12/2023 12:04:15 AM (7 months ago)
Author:
westonruter
Message:

Bundled Themes: Use defer loading strategy for theme scripts.

  • 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.

File:
1 edited

Legend:

Unmodified
Added
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  • trunk/src/wp-content/themes/twentythirteen/functions.php

    r56526 r56556  
    322322
    323323    // Loads JavaScript file with functionality specific to Twenty Thirteen.
    324     wp_enqueue_script( 'twentythirteen-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '20230526', array( 'in_footer' => true ) );
     324    wp_enqueue_script(
     325        'twentythirteen-script',
     326        get_template_directory_uri() . '/js/functions.js',
     327        array( 'jquery' ),
     328        '20230526',
     329        array(
     330            'in_footer' => false, // Because involves header.
     331            'strategy'  => 'defer',
     332        )
     333    );
    325334
    326335    // Add Source Sans Pro and Bitter fonts, used in the main stylesheet.
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