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    <p>Modern browsers don't implement this outdated thing any more. It was introduced by IE, but most of the others "shim" it to be compatible.</p> <p>To make browser detection possible (back in the old days you could tell IE apart from NN by testing for <code>document.all</code>) while supporting document.all syntax, other browsers made the "weird" implementation that <code>typeof document.all</code> returns undefined.</p> <pre><code>Opera&gt; document.all // prints the array-like object Opera&gt; typeof document.all "undefined" Opera&gt; Boolean(document.all) false </code></pre> <p>Before FF dropped support for it, it also showed weird behaviour as stated in <a href="http://old.nabble.com/FF-document.all-boolean-conversion%3A-please-vote-for-Rhino-patch-allowing-to-support-it-correctly-p14799030.html" rel="nofollow">this message</a>. You may find more internals in <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=412247" rel="nofollow">Mozilla bug #412247</a>.</p> <p>There is also a <a href="http://www.w3.org/Search/Mail/Public/advanced_search?keywords=typeof+document.all&amp;hdr-1-name=subject&amp;hdr-1-query=&amp;hdr-2-name=from&amp;hdr-2-query=&amp;hdr-3-name=message-id&amp;hdr-3-query=&amp;period_month=&amp;period_year=&amp;index-grp=Public__FULL&amp;index-type=t&amp;type-index=public-html&amp;resultsperpage=100&amp;sortby=date-asc" rel="nofollow">very long thread</a> in the W3C mailing list archive, beginning with <a href="http://lists.w3.org/Archives/Public/public-html/2009Jun/0546.html" rel="nofollow">http://lists.w3.org/Archives/Public/public-html/2009Jun/0546.html</a></p>
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