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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
610 | */ |
611 | function twentytwentyone_the_html_classes() { |
612 | /** |
613 | * Filters the classes for the main <html> element. |
614 | * |
615 | * @since Twenty Twenty-One 1.0 |
616 | * |
617 | * @param string The list of classes. Default empty string. |
618 | */ |
619 | $classes = apply_filters( 'twentytwentyone_html_classes', '' ); |
620 | if ( ! $classes ) { |
621 | return; |
622 | } |
623 | echo 'class="' . esc_attr( $classes ) . '"'; |
624 | } |
625 |
|
626 | /** |
627 | * Add "is-IE" class to body if the user is on Internet Explorer. |
628 | * |