Interface Description Language (IDL): Test Page

Getting value with DOM `role` property
Setting Code	Return value of `.role`
<input type="checkbox"/>
<div role="checkbox">
e.setAttribute('role', 'checkbox');
e.role = 'checkbox';

Getting value with DOM `ariaChecked` property
Setting Code	Return value of `.ariaChecked`	typeof`.ariaChecked`
<div role='checkbox' aria-checked='true'>
e.setAttribute('aria-checked', 'true');
e.ariaChecked = 'true';
e.ariaChecked = true;