6 methods override HandlerInterface::handle()

CommentHandler::handle in vendor/symfony/css-selector/Parser/Handler/CommentHandler.php
HashHandler::handle in vendor/symfony/css-selector/Parser/Handler/HashHandler.php
IdentifierHandler::handle in vendor/symfony/css-selector/Parser/Handler/IdentifierHandler.php
NumberHandler::handle in vendor/symfony/css-selector/Parser/Handler/NumberHandler.php
StringHandler::handle in vendor/symfony/css-selector/Parser/Handler/StringHandler.php
WhitespaceHandler::handle in vendor/symfony/css-selector/Parser/Handler/WhitespaceHandler.php