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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 |
|---|---|
| 597 | |
| 598 | /** |
| 599 | * Calculate classes for the main <html> element. |
| 600 | * |
| 601 | * @since Twenty Twenty-One 1.0 |
| 602 | * |
| 603 | * @return void |
| 604 | */ |
| 605 | function twentytwentyone_the_html_classes() { |
| 606 | $classes = apply_filters( 'twentytwentyone_html_classes', '' ); |
| 607 | if ( ! $classes ) { |
| 608 | return; |
| 609 | } |
| 610 | echo 'class="' . esc_attr( $classes ) . '"'; |
| 611 | } |
| 612 | |
| 613 | /** |
| 614 | * Add "is-IE" class to body if the user is on Internet Explorer. |
| 615 | * |