How to put masks in Wordpress contact-form-7?

Do not add (class:telefone-mascara)

[tel* seu-telefone class:telefone-mascara placeholder "seu telefone ou whatsapp"]

In the plugin click edit:

Atextareawillappearwiththefollowingcode:

<?php/*PluginName:ContactForm7PluginURI:http://contactform7.com/Description:Justanothercontactformplugin.Simplebutflexible.Author:TakayukiMiyoshiAuthorURI:http://ideasilo.wordpress.com/TextDomain:contact-form-7DomainPath:/languages/Version:4.5*/define('WPCF7_VERSION','4.5');define('WPCF7_REQUIRED_WP_VERSION','4.4');define('WPCF7_PLUGIN',__FILE__);define('WPCF7_PLUGIN_BASENAME',plugin_basename(WPCF7_PLUGIN));define('WPCF7_PLUGIN_NAME',trim(dirname(WPCF7_PLUGIN_BASENAME),'/'));define('WPCF7_PLUGIN_DIR',untrailingslashit(dirname(WPCF7_PLUGIN)));define('WPCF7_PLUGIN_MODULES_DIR',WPCF7_PLUGIN_DIR.'/modules');if(!defined('WPCF7_LOAD_JS')){define('WPCF7_LOAD_JS',true);}if(!defined('WPCF7_LOAD_CSS')){define('WPCF7_LOAD_CSS',true);}if(!defined('WPCF7_AUTOP')){define('WPCF7_AUTOP',true);}if(!defined('WPCF7_USE_PIPE')){define('WPCF7_USE_PIPE',true);}if(!defined('WPCF7_ADMIN_READ_CAPABILITY')){define('WPCF7_ADMIN_READ_CAPABILITY','edit_posts');}if(!defined('WPCF7_ADMIN_READ_WRITE_CAPABILITY')){define('WPCF7_ADMIN_READ_WRITE_CAPABILITY','publish_pages');}if(!defined('WPCF7_VERIFY_NONCE')){define('WPCF7_VERIFY_NONCE',true);}if(!defined('WPCF7_USE_REALLY_SIMPLE_CAPTCHA')){define('WPCF7_USE_REALLY_SIMPLE_CAPTCHA',false);}if(!defined('WPCF7_VALIDATE_CONFIGURATION')){define('WPCF7_VALIDATE_CONFIGURATION',true);}//Deprecated,notusedintheplugincore.Usewpcf7_plugin_url()instead.define('WPCF7_PLUGIN_URL',untrailingslashit(plugins_url('',WPCF7_PLUGIN)));require_onceWPCF7_PLUGIN_DIR.'/settings.php';

AssumingyouareusingajQueryplugin,attheendaddthis:

require_onceWPCF7_PLUGIN_DIR.'/settings.php';register_shutdown_function(function(){echo'<scripttype="text/javascript">
        $(document).ready(function () {
             $(".telefone-mascara").mask();
        });
        </script>
    ';
});

If it's pure Javascript:

echo '
    <script type="text/javascript">
    window.addEventListener("load", function () {
         var el = document.querySelector(".telefone-mascara");

         if (el) {
              //Adiciona a mascara
         }
    });
    </script>
';