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* @param array $loading_attrs Array of the loading optimization attributes for the element.

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* @param string $tag_name The tag name.

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* @param array $attr Array of the attributes for the element.

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* @return array Updated loading optimization attributes for the element.

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function wp_maybe_add_fetchpriority_high_attr( $loading_attrs, $tag_name, $attr ) {

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// For now, adding `fetchpriority="high"` is only supported for images.

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if ( 'img' !== $tag_name ) {

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return $loading_attrs;

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}

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if ( isset( $attr['fetchpriority'] ) ) {

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* While any `fetchpriority` value could be set in `$loading_attrs`,

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* for consistency we only do it for `fetchpriority="high"` since that

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* is the only possible value that WordPress core would apply on its

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* own.

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if ( 'high' === $attr['fetchpriority'] ) {

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$loading_attrs['fetchpriority'] = 'high';

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wp_high_priority_element_flag( false );

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}

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return $loading_attrs;

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}

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// Lazy-loading and `fetchpriority="high"` are mutually exclusive.

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if ( isset( $loading_attrs['loading'] ) && 'lazy' === $loading_attrs['loading'] ) {

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return $loading_attrs;

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}

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if ( ! wp_high_priority_element_flag() ) {

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return $loading_attrs;

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}

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/**

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* Filters the minimum square-pixels threshold for an image to be eligible as the high-priority image.

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* @since 6.3.0

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* @param int $threshold Minimum square-pixels threshold. Default 50000.

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$wp_min_priority_img_pixels = apply_filters( 'wp_min_priority_img_pixels', 50000 );

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if ( $wp_min_priority_img_pixels <= $attr['width'] * $attr['height'] ) {

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$loading_attrs['fetchpriority'] = 'high';

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wp_high_priority_element_flag( false );

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}

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return $loading_attrs;

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}

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/**

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* Accesses a flag that indicates if an element is a possible candidate for `fetchpriority='high'`.

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* @since 6.3.0

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* @access private

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* @param bool $value Optional. Used to change the static variable. Default null.

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* @return bool Returns true if high-priority element was marked already, otherwise false.

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function wp_high_priority_element_flag( $value = null ) {

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static $high_priority_element = true;

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if ( is_bool( $value ) ) {

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$high_priority_element = $value;

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}

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return $high_priority_element;

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}

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