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Since 3.7 there is a filter to change the width of the wrapping div directly. This will fix the extra 10px, and won't let the caption extend past the width of the image (unlike width: auto !important). function wp456_img_caption_width( $width, $atts, $content){ //by default 10 is added if image caption return $width - 10; } add_filter( '...


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Here's one way to inject the custom field as the featured image caption with help of the post_thumbnail_html filter: add_filter( 'post_thumbnail_html', function( $html, $post_id ) { if( $html && $caption = get_post_meta( $post_id, 'wpcf-bildunterschrift', true ) ) $html .= sprintf( '<p>%s</p>', sanitize_text_field( $caption ) ...



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