height of an iframe in a Confluence app expands infinitely when the html/body set to 100%
Asked by Sal Mourad:

**Issue Overview:**

I'm encountering a persistent problem with our Confluence app where the iframe height continuously expands indefinitely. This issue arises when we set the `html` and `body` elements to 100% height in our CSS, which we need to ensure the app content properly fills the screen. Instead, the iframe content initially loads at less than half the screen height and then starts expanding without limit. Looking at the developer tools (inspect), I can see that the Iframe height is increasing infinitely.

**Details:**

1. **CSS Setup:**

   * We attempted to set the height of the `html` and `body` elements to 100% to make the content fill the screen.

   * We also tried setting the body height to 100vh.

   * Both approaches resulted in the iframe height expanding infinitely

Here is the CSS used:

    html,body {    font-family: Arial, sans-serif;    margin: 0;    padding: 0;    background-color: #f4f4f4;    height: 100%;}body {    height: 100vh; /* Tried both 100% and 100vh */}nav ul {    list-style-type: none;    padding: 0;}nav ul li {    display: inline;    margin-right: 10px;}nav ul li a {    text-decoration: none;    color: #333;}.container {    margin: 20px;    height: 100%;    width: 100%;}

**2. JavaScript for Handling Iframe Resizing:**

* We included the `all.js` script from Atlassian to handle iframe resizing.

* Added a script to dynamically include the `all.js` file and call `AP.resize()` function to adjust the iframe size.

Here is the JavaScript we used:

    document.addEventListener('DOMContentLoaded', function () {    const script = document.createElement('script');    script.src = "https://connect-cdn.atl-paas.net/all.js";    script.async = true;    document.head.appendChild(script);    function resizeIframe() {        if (window.AP) {            window.AP.resize();        }    }    resizeIframe();    setInterval(resizeIframe, 500); // Adjust the interval as needed});

**HTML Structure:**

* Our HTML structure in the Handlebars template (main.hbs) is as follows:

    <!DOCTYPE html><html><head>    <title>{{title}}</title>    <link rel="stylesheet" type="text/css" href="/css/styles.css"></head><body>    <nav>        <ul>            <li><a href="/dashboard">Dashboard</a></li>            <li><a href="/documentation">Documentation</a></li>        </ul>    </nav>    <div class="container">        {{{body}}}    </div>    <script src="/js/scripts.js"></script></body></html>

**Current Behavior:**

* When the app loads, the iframe height starts at less than half of the screen height.

* As soon as we set the `html` and `body` height to 100%, the iframe height starts expanding infinitely.

* Setting specific pixel values for height prevents infinite growth but doesn't achieve the desired responsive design.

**Community Insights:**

* Has anyone experienced similar issues with iframe height expanding indefinitely in Confluence apps?

* Are there any recommended approaches or best practices for handling iframe resizing in Confluence apps?

* Could there be any specific configuration or settings we might be missing that could resolve this issue?

thank you for any help.


Answers:
author: Jessica
body: Hi [@Sal Mourad](/t5/user/viewprofilepage/user-id/5548230)

Welcome to the Atlassian Community!

From the description, since Custom CSS is not available in Confluence Cloud, I believe you are trying to create a custom Confluence app or a custom Confluence macro. Is that correct?

If that is the scenario, I believe this question would be better answered and get additional help in our [Developer Community](https://community.developer.atlassian.com/), as more users are developing apps and custom macros, and our development team may be able to help with some of those queries. :)

Hope this helps!

Regards,  
Jessica

comments: author: Sal Mourad
body: Hi Jessica,

Thank you for your response.

I have already posted in the Developer Community 5 days ago about the same issue, but I have not received a response from anyone. Is there any way for someone from the development team to look at my question so I can get some help with this? And yes, this is about a custom app.

Hope to hear from you soon.

Regards,  
Sal Mourad  

link to post: <https://community.developer.atlassian.com/t/issue-where-the-height-of-an-iframe-in-a-confluence-app-continuously-expands-infinitely-when-the-html-and-body-elements-are-set-to-100-height-causing-layout-problems/81963>


author: Jessica
body: Thanks for sharing the link for the post in the developer community, Sal.

Let me check this internally to understand how the developer community is working right now, since you got no answer so far.

Once I have more updates on this, I'll get back to you here. :)  

Regards,  
Jessica


author: Sal Mourad
body: Thanks for your help Jessica, I appreciate you taking the time!

Best,

Sal


author: Sal Mourad
body: Hi [@Jessica](/t5/user/viewprofilepage/user-id/3667333) , I was wondering if there was any updates regarding this issue?   

Thanks,

Sal


author: Jessica
body: Hey [@Sal Mourad](/t5/user/viewprofilepage/user-id/5548230)

Apologies for missing your message and not sharing updates.

I'm still following up on this internally engaging with multiple teams on this.

I have just engaged with another internal team to see if they could help on the questions above.

Thank you for your continued patience on this one!

<br />

Regards,  
Jessica


author: Sal Mourad
body: Hi [@Jessica](/t5/user/viewprofilepage/user-id/3667333)   

thanks for the update, I appreciate you efforts. Looking forward to hearing back from you soon.   

Best,

Sal


author: Jessica
body: Hi [@Sal Mourad](/t5/user/viewprofilepage/user-id/5548230)

We got an update!  
Since it may be needed some additional information for troubleshooting and a HAR file (please don't share it here or at the developer community post) and to avoid sharing any private information in the public posts, would you be able to open a request with our development team at <https://developer.atlassian.com/support>?

That should allow you to open a request even if you are an individual developer.

If you have any additional information on how to reproduce the issue other than the details you shared in the developer community post, please feel free to share it there as well!

If you have any issues opening a developer support request from there, please let me know, and I'll check with the team to determine the best way to proceed.

Regards,  
Jessica


author: Sal Mourad
body: Hi [@Jessica](/t5/user/viewprofilepage/user-id/3667333)

Thanks so much for the update. I will be sending in more details to the link you provided.   

If I have any issues ill be sure to reach out.

thanks again,

Sal


Tags: cloud

confluence-cloud

iframe