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Ignore:
Timestamp:
10/21/2025 05:59:38 AM (3 months ago)
Author:
westonruter
Message:

Script Loader: Load block styles on demand in classic themes via the template enhancement output buffer.

  • This applies in classic themes when a site has not opted out of the template enhancement buffer by filtering wp_should_output_buffer_template_for_enhancement off.
  • Both should_load_separate_core_block_assets and should_load_block_assets_on_demand are filtered on, as otherwise they are only enabled by default in block themes.
  • Any style enqueued after wp_head and printed via print_late_styles() will get hoisted up to be inserted right after the wp-block-library inline style in the HEAD.
  • The result is a >10% benchmarked improvement in LCP for core classic themes due to a ~100KB reduction in the amount of CSS unconditionally being served with every page load.

Developed in https://github.com/WordPress/wordpress-develop/pull/10288

Follow-up to [60936].

Props sjapaget, westonruter, peterwilsoncc, dmsnell, mindctrl.
See #43258.
Fixes #64099.

File:
1 edited

Legend:

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  • trunk/tests/phpunit/tests/style-engine/wpStyleEngineCssRulesStore.php

    r58089 r61008  
    1717class Tests_Style_Engine_wpStyleEngineCSSRulesStore extends WP_UnitTestCase {
    1818    /**
    19      * Cleans up stores after each test.
    20      */
    21     public function tear_down() {
    22         WP_Style_Engine_CSS_Rules_Store::remove_all_stores();
    23         parent::tear_down();
    24     }
    25 
    26     /**
    2719     * Tests creating a new store on instantiation.
    2820     *
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