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<?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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/** |
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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 gutenberg_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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|
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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 $block_content; |
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} |
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|
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$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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|
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add_filter( 'render_block_core/details', 'gutenberg_block_core_details_set_img_fetchpriority_low', 10, 2 ); |
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|
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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 gutenberg_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', 'gutenberg_register_block_core_details', 20 ); |
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|
