HTML <meta> http-equiv属性
例
30秒ごとにドキュメントを更新します。
<head>
<meta http-equiv="refresh" content="30">
</head>
定義と使用法
属性は、http-equiv
属性の情報/値のHTTPヘッダーを提供しcontent
ます。
このhttp-equiv
属性を使用して、HTTP応答ヘッダーをシミュレートできます。
ブラウザのサポート
Attribute | |||||
---|---|---|---|---|---|
http-equiv | Yes | Yes | Yes | Yes | Yes |
構文
<meta http-equiv="content-security-policy|content-type|default-style|refresh">
属性値
Value | Description |
---|---|
content-security-policy | Specifies a content policy for the document. Example: <meta http-equiv="content-security-policy" content="default-src 'self'"> |
content-type | Specifies the character encoding for the document. Example: <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
default-style | Specified the preferred style sheet to use. Example: <meta http-equiv="default-style" content="the document's preferred stylesheet"> Note: The value of the content attribute above must match the value of the title attribute on a link element in the same document, or it must match the value of the title attribute on a style element in the same document. |
refresh | Defines a time interval for the document to refresh itself.
Example: <meta http-equiv="refresh" content="300"> Note: The value "refresh" should be used carefully, as it takes the control of a page away from the user. Using "refresh" will cause a failure in W3C's Web Content Accessibility Guidelines. |
❮HTML<meta>タグ