wp-includes/theme.php:1968Renders the Custom CSS style element.
function wp_custom_css_cb() { $styles = wp_get_custom_css(); if ( $styles || is_customize_preview() ) : $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"'; ?> <style<?php echo $type_attr; ?> id="wp-custom-css"> <?php // Note that esc_html() cannot be used because `div > span` is not interpreted properly. echo strip_tags( $styles ); ?> </style> <?php endif;}Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.