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CSS
The allowfullscreen attribute is used to enable fullscreen mode for an HTML element, such as a <iframe> or <video> element. The attribute can be added to the HTML element like so:
<iframe src="example.com" allowfullscreen></iframe>
You can also set the attribute using JavaScript:
document.getElementById("myiframe").allowFullscreen = true;
CSS can also be used to control the appearance of the element while in fullscreen mode. For example, to hide the element's controls while in fullscreen mode:
iframe::-webkit-full-screen {
/* styles here */
}
Additionally, you can use :fullscreen pseudoclass to target the element when it is in fullscreen mode:
iframe:fullscreen {
/* styles here */
}
You can also listen to the fullscreenchange event on the document to detect when the element enters and exits fullscreen mode.
document.addEventListener("fullscreenchange", function(event) {
if (document.fullscreenElement) {
console.log("Element entered fullscreen mode.");
} else {
console.log("Element exited fullscreen mode.");
}
});
It's important to note that not all browsers support the fullscreen API and the allowfullscreen attribute, so you may want to provide a fallback or alternative for users on older browsers.