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Filename :
wp-compat.php
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<?php if ( ! function_exists( 'wp_sizes_attribute_includes_valid_auto' ) ) { /** * Polyfill for wp_sizes_attribute_includes_valid_auto(). * * Checks if the first value in a 'sizes' attribute is 'auto'. * * @param string $sizes_attr The value of the 'sizes' attribute. * @return bool True if the first value is 'auto', false otherwise. */ function wp_sizes_attribute_includes_valid_auto( $sizes_attr ) { list( $first_size ) = explode( ',', $sizes_attr, 2 ); return 'auto' === strtolower( trim( $first_size, " \t\f\r\n" ) ); } } if ( ! function_exists( 'wp_print_auto_sizes_contain_css_fix' ) ) { /** * Polyfill for wp_print_auto_sizes_contain_css_fix(). * * Prints a CSS rule to fix potential visual issues with images using `sizes=auto`. * * This rule overrides the similar rule in the default user agent stylesheet, to avoid images that use e.g. * `width: auto` or `width: fit-content` to appear smaller. * * @see https://html.spec.whatwg.org/multipage/rendering.html#img-contain-size * @see https://core.trac.wordpress.org/ticket/62413 */ function wp_print_auto_sizes_contain_css_fix() { /** This filter is documented in wp-includes/media.php */ $add_auto_sizes = apply_filters( 'wp_img_tag_add_auto_sizes', true ); if ( ! $add_auto_sizes ) { return; } ?> <style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style> <?php } // @see https://github.com/WordPress/wordpress-develop/pull/7813 add_action( 'wp_head', 'wp_print_auto_sizes_contain_css_fix', 1 ); }