`h7-h9 via aria-level` elements

Pass Criteria

#1: Element is supported
#2: Correct HTML and Core Accessibility API mappings
#3: Correct Accessible Name & Description Calculation

Reference

Test hd-001: `h7 - h9` elements

h1 heading + aria-level="7"

h2 heading aria-level="8"

h3 heading + aria-level="9"

h4 heading + aria-level="10"

Test hd-002: `h1` element, with `role="heading"` & `aria-level="7"`

Heading Level 7?

Test hd-003: `h2` element, with `aria-level="8"`

Heading Level 8?

Test hd-004: `h1 - h6 + aria-level 7 - 12` elements with no content

Test hd-005: `h7 - h12 (aria-level 7 - 12)` elements with `aria-label`

poot7

poot8

poot9

poot10

poot11

poot12