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This allows attackers to do a boolean probe on the URL of a cross-origin iframe, by attempting to navigate it to a given URL, and if history.length does not increase, they know that the iframe is currently pointed to that URL.

Closes #2018, at least the actionable part where you can get more information than just what is retrieved using the load event.
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July 28, 2021 10:59
December 16, 2017 07:55
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This repository hosts the HTML Standard.

Code of conduct

We are committed to providing a friendly, safe and welcoming environment for all. Please read and respect the WHATWG Code of Conduct.

Contribution opportunities

We appreciate all contributions, see the guidelines for contributing for details, including information on how to build HTML output from the source file so you can preview your changes locally.

Tests

Tests are in the html/ directory of the web-platform-tests repository.

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As the source file is too large for GitHub's blame utility, use blame for source on searchfox instead.