HTML 参考手册

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HTML output form 属性

form 属性规定 <output> 元素所属的一个或多个表单。

在线示例

位于表单外部（但仍是表单的一部分）的<output>元素：

示例

<!DOCTYPE　html>
<html>
<head>
<title>HTML:<output>　form　属性　-　基础教程网(oldtoolbag.com)</title>
</head>
<body>
<form　action="action_page.php"　id="numform"　oninput="x.value=parseInt(a.value)+parseInt(b.value)>0
<input　type="range"　id="a"　name="a"　value="30">100
+<input　type="number"　id="b"　name="b"　value="30">
<br><br>
<input type="submit">
</form>
<p>The output element below is outside the form, but is still part of the form.</p>
<output form="numform" name="x" for="a b"></output>
</body>
</html>

Test see ‹/›

Browser Compatibility

IEFirefoxOperaChromeSafari

Almost all mainstream browsers do not support the form attribute.

Definition and Usage

The form attribute specifies one or more forms to which the <output> element belongs.

HTML 4.01 and HTML5differences between

The <output> tag is an HTML5 new tag in.

Syntax

<output form="form_id">

Attribute Value

Value	Description
form_id	Specify the form element to which the <output> element belongs. The value of this attribute must be the id attribute of a <form> element in the same document.

　HTML <output> Tag

HTML: <template> Tag