Implements Stylesheet.ownerNode
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Make hidden input _charset_ check case insensitive
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Implement DOMTokenList.supports API
Implement DOMTokenList.supports API and "rel" attribute for HTMLAreaElement
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preferences actor now returns real values.
The preferences actor was previously returning mock values. This changes
picks up the pref_values from the pref_map which is global preferences
state and returns values from there.
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