For the ignoreNonDOM option, this determines if developer created components are checked.
Succeed
<div role="button"></div> <!-- Good: "button" is a valid ARIA role -->
<div role={role}></div> <!-- Good: role is a variable & cannot be determined until runtime. -->
<div></div> <!-- Good: No ARIA role -->
<Foo role={role}></Foo> <!-- Good: ignoreNonDOM is set to true -->
Fail
<div role="datepicker"></div> <!-- Bad: "datepicker" is not an ARIA role -->
<div role="range"></div> <!-- Bad: "range" is an _abstract_ ARIA role -->
<div role=""></div> <!-- Bad: An empty ARIA role is not allowed -->
<Foo role={role}></Foo> <!-- Bad: ignoreNonDOM is set to false or not set -->