Filters the third-row list of TinyMCE buttons (Visual tab).

$mce_buttons_3 array

Third-row list of buttons.

$editor_id string

Unique editor identifier, e.g. 'content'. Accepts 'classic-block' when called from block editor's Classic block.

File: wp-includes/class-wp-editor.php. View all references

$mce_buttons_3 = apply_filters( 'mce_buttons_3', array(), $editor_id );