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**Category:** Ask the community\
**Tags:** wix-studio, design, question, wix-blocks, code\
**Created:** [February 15, 2026, 1:31am UTC](https://forum.wixstudio.com/t/html-iframe-element-on-mobile-is-it-possible-to-control-fullscreen-behavior-or-iframe-sizing/76611 "2026-02-15T01:31:45Z")\
**Posts on this page:** 2\
**Page:** 1
**Author:**  [@lucas\_curto](https://forum.wixstudio.com/u/lucas_curto)\
**Post date:** [February 15, 2026, 1:31am UTC](https://forum.wixstudio.com/t/html-iframe-element-on-mobile-is-it-possible-to-control-fullscreen-behavior-or-iframe-sizing/76611/1 "2026-02-15T01:31:45Z")
Hi Wix team 👋
I’m embedding a custom widget using the **HTML iFrame element** (Embed Code) in Wix Studio. The widget is a **Custom Element (Web Component)** that mounts a React app inside the iframe.
**Context**
- The widget loads correctly on desktop.
- On **mobile** , Wix renders the HTML element as a fullscreen overlay iframe.
- Any CSS or JS I apply only affects the HTML _inside_ the iframe (as expected), not the iframe container created by Wix.
**Question**
Is there **any supported way** to:
1. Control or override the **iframe sizing/positioning on mobile** , or
2. Prevent the HTML iFrame element from becoming fullscreen on mobile, or
3. Programmatically interact with or configure the iframe container created by Wix (via Velo / Custom Code)?
From the documentation, I understand that:
- HTML Embed elements are always rendered inside a **sandboxed iframe**
- Even Wix Custom Elements / Velo Custom Elements still run **inside that iframe**
- CSS/JS cannot reach the parent document
I just want to confirm officially:
👉 **Is the mobile fullscreen behavior of HTML iFrame elements hard-coded and non-configurable?**
👉 Or is there any recommended pattern (flags, settings, APIs) to handle this use case?
**What I’m trying to achieve**
- On mobile: open the widget in a controlled “fullscreen-like” mode _only when the user interacts_
- Avoid Wix forcing fullscreen immediately when the iframe loads
If the answer is “this is not possible and must be handled inside the iframe UI”, that’s totally fine — I just want to be sure before redesigning the widget UX.
Thanks in advance 🙏
Any clarification or official guidance would be super helpful.
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**Author:**  [@onemoretime](https://forum.wixstudio.com/u/onemoretime)\
**Post date:** [February 15, 2026, 4:19am UTC](https://forum.wixstudio.com/t/html-iframe-element-on-mobile-is-it-possible-to-control-fullscreen-behavior-or-iframe-sizing/76611/2 "2026-02-15T04:19:21Z")
Hi, @lucas_curto !!
Personally, I don’t recall iframes being automatically rendered in full-screen mode on mobile—I wonder if it’s been changed to work like that lately? 🤔 Also, regarding Wix Custom Elements, my understanding is that they run within an iframe inside the editor, but behave differently on the live site. 😇