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Applicability
This rule applies to any non-focusable iframe element that has focusable content.
Expectation
For each test target, the nested browsing context does not contain elements that are visible and part of the sequential focus navigation.
An element is contained in a nested browsing context if its owner document is the container document of the nested browsing context.
Assumptions
This rule assumes that interactive content inside iframe elements is used to provide functionality. If the interactive content does not provide functionality, for example a button that does nothing when clicked, success criterion 2.1.1 may be satisfied, even if the rule is failed.