HTML report does not persist column sort in Chrome

[nedbat]

Originally reported by Federico Bond (Bitbucket: federicobond, GitHub: federicobond)

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Chrome does not support cookies in pages opened with the file:// protocol.

We can replace the cookie with localStorage, which is widely supported across browsers and is probably more appropriate for this use case.

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• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/611

[nedbat]

This is fixed in 5.0a2.