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Add feature for responsive iframes #4077

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Add feature for responsive iframes #4077

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13 changes: 13 additions & 0 deletions features/frame-sizing.yml
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name: Responsive iframes
description: >
The `frame-sizing` CSS property sets the size of an `<iframe>` element to that of it contents, to avoid scrolling in the iframe.
Embedded documents allow this with the `<meta name="responsive-embedded-sizing">` element and request resizing in the embedding page by calling `window.requestResize()`.
spec: https://drafts.csswg.org/css-sizing-4/#propdef-frame-sizing
# Expected
# compat_features:
# - css.properties.frame-sizing

@malchata malchata Jun 17, 2026

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Question for @ddbeck: The linked spec in the feature here mentions the frame's "internal intrinsic size"—would this warrant linking the min-content and max-content CSS keywords in this feature? I'm referring specifically to the intrinsic size concept, as it figures in pretty heavily here for <iframe> contents.

On the other side, I suppose it could be argued that you'd then have to add references for these keywords to many features' compat_features field.

# - css.properties.frame-sizing.auto
# - css.properties.frame-sizing.content-width

@Elchi3 Elchi3 Jun 1, 2026

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C.f. https://collector.openwebdocs.org/tests/css/properties/frame-sizing

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# - css.properties.frame-sizing.content-width
# - css.properties.frame-sizing.content-height
# - css.properties.frame-sizing.content-width

# - css.properties.frame-sizing.content-block-size
# - css.properties.frame-sizing.content-inline-size
# - api.Window.requestResize

@Elchi3 Elchi3 Jun 1, 2026

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Maybe also this?

Suggested change
# - api.Window.requestResize
# - api.Window.requestResize
# - html.elements.meta.name.responsive-embedded-sizing

6 changes: 6 additions & 0 deletions features/frame-sizing.yml.dist
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# Generated from: frame-sizing.yml
# Do not edit this file by hand. Edit the source file instead!

status:
baseline: false
support: {}