| HTMLIsIndexElement should inherit directly from HTMLElement and be an HTMLUnknownElement |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS isIndex.__proto__ is HTMLUnknownElement.prototype |
| PASS isIndex.__proto__.__proto__ is HTMLElement.prototype |
| PASS isIndex.prompt is undefined. |
| PASS isIndex.form is undefined. |
| PASS isIndex.defaultValue is undefined. |
| PASS isIndex.disabled is undefined. |
| PASS isIndex.multiple is undefined. |
| PASS isIndex.alt is undefined. |
| PASS isIndex.accept is undefined. |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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