diff --git a/_posts/guidelines/2019-02-19-frontend.md b/_posts/guidelines/2019-02-19-frontend.md
index c29c51d..24287e9 100644
--- a/_posts/guidelines/2019-02-19-frontend.md
+++ b/_posts/guidelines/2019-02-19-frontend.md
@@ -108,6 +108,20 @@ revisao: 2023-11-19
 </script>
 ```
 
+### Formatar um campo de texto para o formato telefônico brasileiro
+
+```html
+<html>
+    <head>
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.mask/1.14.10/jquery.mask.js"></script>
+    </head>
+    <body>
+        <input type="text" id="telefone" name="telefone" placeholder="Informe o seu telefone" onclick="this.select();" size="30" maxlength="15" onkeypress="$(this).mask('(00) 00000-0000')" autocomplete="off" required>
+    </body>
+</html>
+```
+
 ## Validadores de código
 
 * [W3C Markup Validation Service](https://validator.w3.org/)
