HTML · Image and media attributes

allowfullscreen

Allows an iframe to enter fullscreen. Prefer allow="fullscreen".

htmlRunnable example html course

Syntax

allowfullscreen

Example

Try it

<iframe src="https://example.com" title="Demo" allowfullscreen width="200" height="120"></iframe>

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.