2.1.5 [WEBSTG] Section 4.5, Threads

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V0009:

The specification states:

 Because of the use of the storage mutex, multiple browsing contexts will be able to access the local storage areas simultaneously in such a manner that scripts cannot detect any concurrent script execution.

IE8 Mode, IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

The storage mutex is not supported.