Frames must be tested with axe-core
How to Fix the Problem
frame elements contain the axe-core script.
after - function (optional) check is the function that gets called for checks that operate on a page-level basis, to process the results from the
frame elements contain the axe-core script rule, when set to true, is only applied when the entire page is tested. Results from nodes on different frames are combined into a single result.
Why it Matters
Without the axe-core script, it is not possible for the tool to perform violation checking on multiple levels of nested iframes.
Frames must be tested with axe-core.
The Algorithm (in simple terms)
iframes property, when set to true, tells axe to run inside iframes. This uses both frame and iframe selectors to check for the axe-core script to return a "review item" result.