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web integration: Add note about cross-origin same-agent functions #126

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Jun 30, 2025
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web integration: Add note about cross-origin same-agent functions #126

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web integration: Add note about cross-origin same-agent functions
nicolo-ribaudo Jun 24, 2025
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Expand Up @@ -753,6 +753,12 @@ will be reset such that document load and tasks that directly flow from it
empty AsyncContext snapshot, which will be an empty mapping (i.e. every
`AsyncContext.Variable` will be set to its initial value).

## Cross-origin iframes

Cross-origin API calls do not propagate the context from one origin to the other, as if they were happening in different agents/threads. This is also true for APIs that synchronously run cross-origin code, such as calling `.focus()` on a cross-origin iframe's window: the context is explicitly reset to the top-level one.

See [whatwg/html#3506](https://github.com/whatwg/html/issues/3506) for related discussion about `focus()`'s behavior on cross-origin iframes.

## Module evaluation

When you import a JS module multiple times, it will only be fetched and
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