Baseline Widely available
The forms read-only property of the Document interface returns an HTMLCollection listing all the <form> elements contained in the document.
Note: Similarly, you can access a list of a form's component user input elements using the HTMLFormElement.elements property.
An HTMLCollection object listing all of the document's forms. Each item in the collection is a HTMLFormElement representing a single <form> element.
If the document has no forms, the returned collection is empty, with a length of zero.
Examples Getting form information<!doctype html>
<html lang="en">
<head>
<title>document.forms example</title>
</head>
<body>
<form id="robby">
<input
type="button"
onclick="alert(document.forms[0].id);"
value="robby's form" />
</form>
<form id="dave">
<input
type="button"
onclick="alert(document.forms[1].id);"
value="dave's form" />
</form>
<form id="paul">
<input
type="button"
onclick="alert(document.forms[2].id);"
value="paul's form" />
</form>
</body>
</html>
const selectForm = document.forms[index];
const selectFormElement = document.forms[index].elements[index];
<!doctype html>
<html lang="en">
<head>
<title>document.forms example</title>
</head>
<body>
<form name="login">
<input name="email" type="email" />
<input name="password" type="password" />
<button type="submit">Log in</button>
</form>
<script>
const loginForm = document.forms.login; // Or document.forms['login']
loginForm.elements.email.placeholder = "test@example.com";
loginForm.elements.password.placeholder = "password";
</script>
</body>
</html>
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