48 lines
1.5 KiB
PHP
48 lines
1.5 KiB
PHP
<?php
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/**
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* Server-side rendering of the `core/details` block.
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*
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* @package WordPress
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*/
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/**
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* Sets fetchpriority="low" on all IMG tags within the collapsed Details block.
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*
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* Images in a collapsed Details block are hidden until the block is expanded, so they should
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* not compete with any resources in the critical rendering path, such as the LCP element image.
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*
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* @since 7.0.0
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*
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* @param string $block_content The block content.
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* @param array $block The full block, including name and attributes.
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* @return string Modified HTML with fetchpriority="low" on all IMG tags when the showContent attribute is false.
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*/
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function block_core_details_set_img_fetchpriority_low( $block_content, array $block ): string {
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if ( ! is_string( $block_content ) ) {
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return '';
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}
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// If the Details block is open by default, short-circuit to let core add fetchpriority=high if appropriate.
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if ( $block['attrs']['showContent'] ?? false ) {
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return $block_content;
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}
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$tags = new WP_HTML_Tag_Processor( $block_content );
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while ( $tags->next_tag( 'IMG' ) ) {
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$tags->set_attribute( 'fetchpriority', 'low' );
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}
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return $tags->get_updated_html();
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}
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add_filter( 'render_block_core/details', 'block_core_details_set_img_fetchpriority_low', 10, 2 );
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/**
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* Registers the `core/details` block on server.
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*
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* @since 7.0.0
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*/
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function register_block_core_details() {
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register_block_type_from_metadata( __DIR__ . '/details' );
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}
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add_action( 'init', 'register_block_core_details' );
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