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32 // Expose a function to watch the |tagName| introduction via mutation observer.
34 // We employee mutation observer to watch on any introduction of |tagName|
36 // reporting error due to lack of permission).
37 // Think carefully about when to call this. On one hand, mutation observer
38 // functions on document, so we need to make sure document is finished
39 // parsing. To satisfy this, document.readyState has to be "interactive" or
40 // after. On the other hand, we intend to do this as early as possible so that
41 // developer would have no chance to bring in any conflicted property. To meet
