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Definition and Usage

The sandbox attribute enables an extra set of restrictions for the content in the iframe.

When the sandbox attribute is present, and it will:

treat the content as being from a unique origin

block form submission

block script execution

disable APIs

prevent links from targeting other browsing contexts

prevent content from using plugins (through <embed> , <object> , <applet> , or other)

prevent the content to navigate its top-level browsing context

block automatically triggered features (such as automatically playing a video or automatically focusing a form control)

The value of the sandbox attribute can either be empty (then all restrictions are applied), or a space-separated list of pre-defined values that will REMOVE the particular restrictions.

Browser Support

The numbers in the table specify the first browser version that fully supports the attribute.

Attribute allow-popups-to-escape-sandbox Allows popups to open new windows without inheriting the sandboxing allow-presentation Allows to start a presentation session allow-same-origin Allows the iframe content to be treated as being from the same origin allow-scripts Allows to run scripts allow-top-navigation Allows the iframe content to navigate its top-level browsing context allow-top-navigation-by-user-activation Allows the iframe content to navigate its top-level browsing context, but only if initiated by user

An <iframe> sandbox allowing form submission:

<iframe src="demo_iframe_sandbox_form.htm" sandbox="allow-forms"></iframe> Try it Yourself »

An <iframe> sandbox allowing scripts:

<iframe src="demo_iframe_sandbox_origin.htm" sandbox="allow-scripts"></iframe> Try it Yourself » ❮ HTML <iframe> tag

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