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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - window.navigator.language incorrectly returns all lowercase string"
href="https://bugs.webkit.org/show_bug.cgi?id=163096">163096</a>
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<th>Summary</th>
<td>window.navigator.language incorrectly returns all lowercase string
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>Safari Technology Preview
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>OS X 10.11
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Bindings
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>matt@mattstow.com
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<th>CC</th>
<td>cdumez@apple.com
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<pre>When calling window.navigator.language, Safari will return something like "en-us", whereas every other browser returns "en-US".
As per [MDN](<a href="https://developer.mozilla.org/en-US/docs/Web/API/NavigatorLanguage/language">https://developer.mozilla.org/en-US/docs/Web/API/NavigatorLanguage/language</a>) and defined in [BCP47](<a href="http://www.ietf.org/rfc/bcp/bcp47.txt">http://www.ietf.org/rfc/bcp/bcp47.txt</a>), valid Extended Language Subtags must be 2*3ALPHA (uppercase).
In the current web app I'm building, this caused havoc with our localization, as the "en-us" didn't match any languages we had localized strings for.</pre>
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