Feature-Policy: autoplay - HTTP 编辑

这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

The HTTP Feature-Policy header autoplay directive controls whether the current document is allowed to autoplay media requested through the HTMLMediaElement interface. When this policy is enabled and there were no user gestures, the Promise returned by HTMLMediaElement.play() will reject with a DOMException. The autoplay attribute on <audio> and <video> elements will be ignored.

For more details on autoplay and autoplay blocking, see the article Autoplay guide for media and Web Audio APIs.

语法

Feature-Policy: autoplay <可选>;

<allowlist>

An allowlist is a list of origins that takes one or more of the following values, separated by spaces:

• *: The feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin.
• 'self': The feature will be allowed in this document, and in all nested browsing contexts (iframes) in the same origin.
• 'src': (In an iframe allow attribute only) The feature will be allowed in this iframe, as long as the document loaded into it comes from the same origin as the URL in the iframe's src attribute. The 'src' origin is used in the iframe allow attribute only, and is the default allowlist value. 
• 'none': The feature is disabled in top-level and nested browsing contexts.
• <origin(s)>: The feature is allowed for specific origins (for example, https://example.com). Origins should be separated by a space.

The values * (enable for all origins) or 'none' (disable for all origins) may only be used alone, while 'self' and 'src' may be used with one or more origins.

Features are each defined to have a default allowlist, which is one of:

• *: The feature is allowed by default in top-level browsing contexts and all nested browsing contexts (iframes).
• 'self': The feature is allowed by default in top-level browsing contexts and in nested browsing contexts (iframes) in the same origin. The feature is not allowed in cross-origin documents in nested browsing contexts.
• 'none': The feature is disabled in top-level and nested browsing contexts.

 默认值是'self'.

参考说明

参考说明	状态	注解
Permissions Policy	Editor's Draft	Initial definition.

浏览器兼容性支持

BCD tables only load in the browser

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• Feature-Policy header
• Feature Policy
• Using Feature Policy