[html] YouTube iframe embed - full screen

I have a form that is iframed into a web page. Upon completion of the form, a YouTube video is displayed from using iframe embed.

When I enter full screen mode of the YouTube video, nothing really happens.

Is the fullscreen of the nested iframe constrained by the dimensions of the parent iframe?

In HTML5, simply use:

<iframe src="https://www.youtube.com/embed/ID" allowfullscreen /> 

This attribute can be set to true if the frame is allowed to be placed into full-screen mode by calling it's Element.requestFullscreen() method. If this isn't set, the element can't be placed into full-screen mode. See Mozilla Docs

In React.js framework use property allowFullScreen.

Note that there are more answers pointing to different directions, so hope this post will unite and simplify all mentioned with latest valid approach.

Putting allowfullscreen inside iframe tag without setting it to true is already deprecated. The updated answer for this issue which is fullscreen is not available with embedded YouTube videos is to set allowfullscreen to true inside tag:

<iframe 
   id="player" 
   src="URL here" 
   allowfullscreen="true">
</iframe>

Tested and working for all browsers without issues.

The best solution and the easiest one to achieve this by using this simple code:

<iframe id="player" src="URL" allowfullscreen></iframe>

Tested and working for all browsers without issues.

Thank you

Inserting after the outer-most iframe from inside the nested iframe fixed the issue for me.

var outerFrame = parent.parent.parent.$('.mostOuterFrame');
parent.$('<iframe />', {
    src: 'https://www.youtube.com/embed/BPlsqo2bk2M'
    }).attr({'allowfullscreen':'allowfullscreen',                             'frameborder':'0' 
    }).addClass('youtubeIframe')
        .css({
            'width':'675px',
            'height':'390px',
            'top':'100px',
            'left':'280px',
            'z-index':'100000',
            'position':'absolute'
         }).insertAfter(outerFrame);

If adding allowfullscreen does not help, make sure you don't have &fs=0 in your iframe url.

jut add allowfullscreen="true" to iframe

  <iframe src="URL here" allowfullscreen="true"> </iframe>

If I understand correctly you have an iframe that contains a second iframe (the youtube one).
Try adding the allowfullscreen attribute to the "parent" iframe.

For full browser support it should look like this:

<iframe src="your_page_url" 
        allowfullscreen="allowfullscreen"
        mozallowfullscreen="mozallowfullscreen" 
        msallowfullscreen="msallowfullscreen" 
        oallowfullscreen="oallowfullscreen" 
        webkitallowfullscreen="webkitallowfullscreen"> </iframe> 

we can get the code below the video. In the share option, we will have an option embed. If we click on the embed we will get the code snippet for that video.

which will be similar to the below code

<iframe width="560" height="315" src="https://www.youtube.com/embed/GZh_Kj1rS74" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

The above code will help you to get the full-screen option.

Noticed mine worked on chrome. Got it to work in Firefox by going to <about:config> and setting full-screen-api.allow-trusted-requests-only to false.

After full screen worked once, I could set that back to true, and full screen still worked which was quite perplexing.

I had to add allowFullScreen attribute to the "parent" iframe. The case of the attribute does matter. I don't think Firefox or Edge/IE11 has a browser specific allowFullScreen attribute. So it looks something like this:

<iframe allowFullScreen='allowFullScreen' src='http://api.youtube.com/...'/>

I found a solution that worked for me on this page thanks to someone named @orangecoat-ciallella

https://www.drupal.org/node/1807158

The "full screen" button was not working in my Chrome browser on Ubuntu.

I was using the media_youtube module for D6. In the iframe it was using a video URL of the pattern //www.youtube.com/v/videoidhere.

I used the theme preprocessing function to make it output > //www.youtube.com/embed/videoidhere and it immediately started allowing the fullscreen button to work.

In short, try changing the /v/ to /embed/ in the YouTube URL if you're having a problem.

I managed to find a relatively clean straightforward way to do this. To see it working click on my webpage: http://developersfound.com/yde-portfolio.html and hover over the 'Youtube Demos' link.

Below are two snippets to show how this can be done quite easily:

I achieved this with an iFrame. Assuming this DOM is 'yde-home.html' Which is the source of your iFrame.

<!DOCTYPE html>
<html>
<head>
    <title>iFrame Container</title>
    <script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>
    <style type="text/css">.OBJ-1 { border:none; }</style>
    <script>
        $(document).ready(function() {
            $('#myHiddenButton').trigger('click');
        });
    </script>
</head>

<body>

    <section style="visibility: hidden;">
        <button id="myHiddenButton" onclick="$(location).attr('href', '"http://www.youtube.com/embed/wtwOZMXCe-c?version=3&amp;start=0&amp;rel=0&amp;fs=1&amp;wmode=transparent;");">View Full Screen</button>
    </section>

    <section class="main-area-inner" style="background:transparent;margin-left:auto;margin-right:auto;position:relative;width:1080px;height:720px;">
        <iframe src="http://www.youtube.com/embed/wtwOZMXCe-c?version=3&amp;start=0&amp;rel=0&amp;fs=1&amp;wmode=transparent;"
        class="OBJ-1" style="position:absolute;left:79px;top:145px;width:1080px;height:720px;">
        </iframe>
    </section>

</body>

</html>

Assume this is the DOM that loads the iFrame.

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <title>Full Screen Youtube</title>
    <script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>
    <script>
        $(document).ready(function() {});           
    </script>
</head>

<body>

    <iframe name="iframe-container" id="iframe-container" src="yde-home.html" style="width: 100%; height: 100%;">
        <p>Your browser does not support iFrames</p>
    </iframe>

</body>

</html>

I've also checked this against the W3c Validator and it validates a HTML5 with no errors.

It is also important to note that: Youtube embed URLs sometimes check to see if the request is coming from a server so it may be necessary to set up your test environment to listen on your external IP. So you may need to set up port forwarding on your router for this solution to work. Once you've set up port forwarding just test from the external IP instead of LocalHost. Remember that some routers need port forwarding from LocalHost/loopback but most use the same IP that you used to log into the router. For example if your router login page is 192.168.0.1, then the port forward would have to use 192.168.0.? where ? could be any unused number (you may need to experiment). From this address you would add the ports that your test environment listen from (normally 80, 81, 8080 or 8088).

React.JS People, remember allowFullScreen and frameBorder="0"

Without camel-case, react strips these tags out!