Re: [w3ctag/design-reviews] Foldables CSS (#472)

In the explainer, it says (emphasis mine)

> iframes where `screen-spanning` feature policy is enabled will receive values in the client coordinates of the top most window, and **it's possible the iframe won't be able to interpret that data without other information** from its embedder. As an example, for cross origin iframes, the iframe's embedder must provide information about how to transform from the root client coordinate space to the iframe's client coordinate space, as **this information is not available to cross-origin iframes for security reasons**.

Why expose the screen spanning information to the iframe at all, if the values can't be used reliably?

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