Iframe Auto-Resize Took 17 Years — Chrome 154 Finally Ships It

Chrome 154's frame-sizing property and the responsive-embedded-sizing meta tag finally kill the postMessage iframe-resize hack. Here's how the API works, why the opt-in and requestResize design matter, and how to adopt it today without breaking Firefox and Safari.

$ 2026.10.12 · 5 min read · #iframes

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Iframe Auto-Resize Took 17 Years — Chrome 154 Finally Ships It

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