There are no signs that this was accidental or a bug, and has been in core for many years. This is because of this set of lines at the end of the main loop of safecss_filter_attr: // Only add the CSS part if it passes the regex check. if ( $allow_css ) { if ( … Read more
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One approach could be forcefully setting 404 status for single post. Please check following example. In case of singular post, query status is set to 404. function theme_slug_customize_single_post() { if ( is_singular( ‘post’ ) ) { global $wp_query; $wp_query->set_404(); status_header(404); } } add_action( ‘wp’, ‘theme_slug_customize_single_post’ );
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