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    <h3>On compatability and jQuery</h3> <p>jQuery 2.x is only meant to be used with Internet Explorer 9 and up. If you wish to have support for fading elements in Internet Explorer 8 (and down to 6), you will need to use jQuery 1.x instead, which still supported the older IE filter property.</p> <p>I have confirmed that switching to jQuery 1.x resolves the issue. Nothing else was necessary, even though it seems in the past additional workarounds may have been needed.</p> <h3>On console and old Internet Explorer</h3> <p>One other thing to keep in mind is that by <code>console</code> doesn't initially exist in IE8. As such, any attempt to call <code>console.log</code> will cause problems. If you wish to use it, pre-check for the availability of <code>console</code> first. You could do this with <code>&amp;&amp;</code>, though this is <a href="http://sampsonblog.com/260/abusages-in-javascript" rel="nofollow">considered an <em>abusage</em></a>:</p> <pre><code>window.console &amp;&amp; console.log( email_regexp.test( email.val() ) ); </code></pre> <p>Alternatively, you can take the more verbose route and make it a proper condition:</p> <pre><code>if ( window.console ) { console.log( email_regexp.test( email.val() ) ); } </code></pre> <p>If you don't want to litter your code with console checks, just define your own:</p> <pre><code>if ( !window.console ) { // When debug is true, console.log alerts var debug = true; window.console = { log: function ( message ) { if ( debug ) alert( message ); } }; } </code></pre> <p>Further Reading: <a href="http://jquery.com/browser-support/" rel="nofollow">jQuery Browser Support</a></p>
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