¿Por qué usamos autocompletar = {valor distinto de encendido/apagado} en HTML?

can anyone tell me why we need to use values of autocomplete other than on/off (like given-name, family-name, new-password,etc.) because i found out that form will be autofilled only when name attribute form exactly matches perviously stored value having same name attribute (e.g. if my form has name="fname" than autocomplete only work when contains previously stored data in which fname="naresh" and it will suggest naresh) also if name attribute not present id attribute should be same. this will happen when autocomplete=on and works same if autocomplete=other_value_except_off then why we use these values (given-name,etc.).

Lo que he probado:

i have created two files input1.html and input2.html. autocomplete only works if name attributes are same no effect of autocomplete - input1.html:

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <form>
    <label for="firstname">first name: </label><input type="text" id="firstname" name="fname" autocomplete="given-name">
    <br>
    <label for="lastname">last name: </label><input type="text" id="lastname" name="lname" autocomplete="family-name">
    <input type="submit">
  </form>
</body>

</html>
input2.html:

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <form>
    <label for="firstname">first name: </label><input type="text" id="firstname" name="firstname"
      autocomplete="given-name">
    <br>
    <label for="lastname">last name: </label><input type="text" id="lastname" name="lastname"
      autocomplete="family-name">
    <input type="submit">
  </form>
</body>

</html>
here if i filled form in input1.html and then open input2.html - no suggetions but if i changed name of input2.html to fname and lname then i will suggestions. what is the role of autocomplete here. i better use autocomplete=on then why we need other values i am using this in google chrome

Solución 1

Atributo HTML: autocompletar – HTML: lenguaje de marcado de hipertexto | MDN[^]:

"on"

El navegador puede completar automáticamente la entrada. No se proporciona ninguna orientación sobre el tipo de datos que se esperan en el campo, por lo que el navegador puede utilizar su propio criterio.

Si simplemente usa “on”, entonces el navegador tiene que adivinar qué tipo de datos espera en el campo.

Si usa un valor más específico, entonces le está diciendo explícitamente al navegador qué tipo de datos hay en el campo, por lo que no necesita adivinar.