Section 6.4:Several occurrences of "preference" rather than "preferences" attrribute:
"A user agent must initialize the preference attribute in accordance with this specification." "Upon getting the preference attribute, the user agent must return a Storage object that represents the storage area for the origin of a widget."
"Whenever the user agent performs any of the following operations on the Storage object of a preference attribute, the user agent must obtain the storage mutex in manner specified in the [WebStorage] specification:" "If a user agent has not previously associated a storage area with the origin of a widget, then the user agent must initialize the preference attribute."
"The steps to initialize the preference attribute are as follows:" S
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