References

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The HTML allow attribute

Attribute All modern browsers Updated
Quick answer

The HTML allow attribute sets a Permissions Policy controlling which features the framed content may use. It is used on the <iframe> element.

Overview

The allow attribute sets a Permissions Policy controlling which features the framed content may use. It applies to the <iframe> element.

It controls powerful features (camera, microphone, geolocation, fullscreen, autoplay) inside the frame, replacing older one-off attributes like allowfullscreen for fine-grained control.

Syntax

<iframe src="map.html" allow="geolocation"></iframe>

Values

Value
A Permissions-Policy directive list, e.g. camera 'none'; fullscreen *; geolocation 'self'.

Best practices

  • Give every <iframe> a descriptive title.
  • Sandbox untrusted content with sandbox, and avoid combining allow-scripts with allow-same-origin for untrusted sources.
  • Grant only the features a frame needs with the allow attribute.
  • Defer off-screen frames with loading="lazy".

Frequently asked questions

What does the allow attribute do?
Sets a Permissions Policy for an iframe.
How do I make an iframe secure?
Restrict untrusted content with sandbox, grant minimal features with allow, and never pair allow-scripts with allow-same-origin for untrusted sources.
How do I embed inline HTML in an iframe?
Use the srcdoc attribute to supply the HTML directly instead of a src URL.
Which elements use the allow attribute?
It is an element-specific attribute, used on the <iframe> element.
action allowfullscreen