Bug 153952 – Feature request: Auto-resize iframes based on content

• Status: NEW
• Component: Frames

[Craig Francis]

After the recent removal of the `@seamless` attribute on the `<iframe>` from the WHATWG spec:

https://github.com/whatwg/html/issues/331

We still need to consider the problem of setting the height of iframes, so they contain their content without scroll bars.

As discussed at:

https://github.com/whatwg/html/issues/555
https://lists.w3.org/Archives/Public/www-style/2016Jan/0236.html
https://lists.w3.org/Archives/Public/www-style/2016Feb/0004.html

The solution may simply involve the CSS:

    #iframe { height: max-content; }

And a header on the framed content, rather than custom/buggy JavaScript.

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I'm keeping my notes on:

https://github.com/craigfrancis/iframe-height

[Craig Francis]

Alternatively we could look at a new keyword for the resize[1] property, which would be useful for a <textarea> that automatically increases its height based on its content - another problem which requires JavaScript to solve.

[1] https://developer.mozilla.org/en-US/docs/Web/CSS/resize

[Simon Fraser (smfr)]

*** Bug 186275 has been marked as a duplicate of this bug. ***

[Sebastian Zartner]

The CSS Working Group resolved on a two-sided solution, an HTML mechanism to express the intrinsic size of the iframe and a 'from-element' keyword for the 'contain-intrinsic-size' property.

See https://github.com/w3c/csswg-drafts/issues/1771#issuecomment-989034819.

Sebastian