Pleaseiframe[seamless]
AvoidhtmlThe seamless attribute on iframe was meant to blend an embedded document into its parent, inheriting styles and flattening borders. It was dropped from the HTML specification and never shipped, so avoid it and style the embed directly instead.
- Verdict
- Avoid
- Category
- HTML features
- Browser support
- Can I Use
- Works in
- all modern browsers
Should you use iframe[seamless] in 2026?
This feature was removed from both the WHATWG and the W3C HTML5 specifications.