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Exception for CORS

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#3,759 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
55/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
javascript
Domain
documentation

Research direction

Start with the cross-window communication page at javascript.info/cross-window-communication and review its CORS discussion. Add the file: protocol exception and the linked MDN reference, explaining the relevant cross-window messaging workaround; done when the page accurately covers this case.

Written by the indexing model from the issue text.

Description

In your page, https://javascript.info/cross-window-communication, an important CORS exception, to me at least, is that the protocol "file:" is always considered to be cross-domain. If you are writing javascript that has to work from a "file:" url, it can't access other local files directly (https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp). You have to use cross-window messaging to talk into/out-of an iframe.

Dominant language
HTML
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Forks
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