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Navigation: Browser.open/close should work as a pair; look into supporting window.open; fire unload event when navigating away from page.
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Send unload event when navigating away from page.
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Time and timezone: within window context, new Date() should use browser clock and timezone; allow changing browser timezone and default to system's.
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Prompts: handle window.confirm and window.alert.
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CSS support: DOM API support for stylesheets and the style attribute; optionally loading so we don't impact performance.