| Checks that HTMLIframeElement.sandbox is a DOMTokenList. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS iframe.sandbox.__proto__ is DOMTokenList.prototype |
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| iframe.sandbox = 'allow-popups allow-scripts allow-scripts allow-same-origin' |
| PASS iframe.sandbox.length is 3 |
| PASS iframe.sandbox[0] is "allow-popups" |
| PASS iframe.sandbox[1] is "allow-scripts" |
| PASS iframe.sandbox[2] is "allow-same-origin" |
| PASS String(iframe.sandbox) is "allow-popups allow-scripts allow-scripts allow-same-origin" |
| PASS iframe.getAttribute('sandbox') is "allow-popups allow-scripts allow-scripts allow-same-origin" |
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| iframe.setAttribute('sandbox', 'allow-popups allow-scripts') |
| PASS iframe.sandbox.length is 2 |
| PASS iframe.sandbox[0] is "allow-popups" |
| PASS iframe.sandbox[1] is "allow-scripts" |
| PASS String(iframe.sandbox) is "allow-popups allow-scripts" |
| PASS iframe.getAttribute('sandbox') is "allow-popups allow-scripts" |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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