According to the Canvas HTML Editor Allowlist, the `nav` element is an allowed tag. In order to properly support screen readers where custom navigation is being created within course material it would be beneficial to allow use of `aria-current` attribute to indicate the current item within a set of related navigation elements.
Allow the use of the `aria-current` attribute to be allowed within the HTML editor. This allows course developers to add support for screen reader users, along-side the visual cues, as to what the current item is within a set of navigation items. This is an attribute used within the global Canvas LMS interface, please allow course creators the same ability to improve support for screen reader users. Reference: WAI-ARIA v1.2 - aria-current :: https://www.w3.org/TR/wai-aria-1.2/#aria-current aria-current - Accessibility | MDN :: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-current
