`mark` element

Pass Criteria

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

Reference

Test mk-001: `mark` element

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Test mk-002: `mark` element with `aria-label`

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Test mk-003: `mark` element with `aria-labelledby`

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Element referenced by aria-labelledby attribute.

Test mk-004: `mark` element with `title` attribute

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Test mk-005: `mark` element with `aria-describedby`

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Element referenced by aria-describedby attribute.

Test mk-006: `mark` element with `aria-label` & `title` attributes

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