allowfullscreen
an HTML attribute for the iframe tag

What is the difference between allowfullscreen and fullscreen in an iframe?

Answers:

  • In an <iframe>, the attributes allowfullscreen and fullscreen serve two different purposes related to fullscreen capabilities, and it's important to understand their distinctions:

    1. allowfullscreen: This is a boolean attribute that indicates whether the content inside the <iframe> is allowed to be displayed in fullscreen mode. If present, it enables the fullscreen feature for the iframe content. Without this attribute, the content may not be able to go fullscreen even if the request is made.

      Example usage:

      <iframe src="https://example.com" allowfullscreen></iframe>

    2. fullscreen: This is not a standard attribute for the <iframe> element. The correct usage is through the requestFullscreen method in JavaScript when implementing fullscreen functionality. You typically request fullscreen for an element using JavaScript rather than with an HTML attribute. However, the keyword "fullscreen" may appear in other contexts, or it could be used informally to refer to content that is displayed in fullscreen mode.

    Summary:

    • allowfullscreen is a valid HTML attribute for <iframe> that permits the embedded content to enter fullscreen mode if the content itself supports it.
    • fullscreen is not a standard attribute in HTML; to make an element fullscreen, you would use JavaScript with element.requestFullscreen().

    Example of using requestFullscreen in conjunction with allowfullscreen:

    <iframe id="myIframe" src="https://example.com" allowfullscreen></iframe>
<button onclick="toggleFullscreen()">Toggle Fullscreen</button>

<script>
function toggleFullscreen() {
    const iframe = document.getElementById('myIframe');
    if (iframe.requestFullscreen) {
        iframe.requestFullscreen(); // Requests the iframe to go fullscreen
    } else if (iframe.mozRequestFullScreen) {
        iframe.mozRequestFullScreen(); // Firefox
    } else if (iframe.webkitRequestFullscreen) {
        iframe.webkitRequestFullscreen(); // Chrome and Safari
    }
}
</script>

    In this example, the allowfullscreen attribute helps grant permission for the iframe to transition into fullscreen, while the JavaScript function handles the action of entering fullscreen when the button is clicked.

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