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PODid IE11 remove javascript conditional compilation?
 

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    <p>I have been determining the version of the IE Trident engine using <a href="http://msdn.microsoft.com/en-us/library/ie/121hztk3%28v=vs.94%29.aspx" rel="nofollow noreferrer">javascript conditional compilation</a>:</p> <pre><code>var ieVersion = undefined; /*@cc_on ieVersion = Math.floor(@_jscript_version); @*/ </code></pre> <p>This worked fine for IE8, 9 and 10. In IE11, the conditionally-commented block does not execute, <em>unless</em> I use the F12 dev tools to emulate IE10 (in which case it returns the correct value, 11).</p> <p>This is confusing, since the <a href="http://msdn.microsoft.com/en-us/library/ie/121hztk3%28v=vs.94%29.aspx" rel="nofollow noreferrer">MSDN page on conditional compilation</a> <em>specifies that it applies to Internet Explorer 11</em>. (<strong>UPDATE 2015-02-03</strong>: this page has since been updated to explicitly state that its content <em>does not</em> apply to IE11 in standards mode.) I've <a href="https://www.google.com/search?q=ie11+javascript+conditional+compilation" rel="nofollow noreferrer">not found any information online</a> to suggest that IE11 should not support conditional comments.</p> <p>Does anyone have any information about this? Can anyone reproduce this behaviour in IE11?</p> <hr> <p>Edit: the relevance of this is in IE's <code>&lt;audio&gt;</code> support. I have a web app that requires playback of around 50 short (~1sec) audio files, which should be played in a (pseudo-)random order, and individually after user interaction. The problems are various:</p> <ul> <li>IE9 has an undocumented limit of 41 <code>audio</code> elements (whether declared in HTML or as JS objects). All subsequent audio files silently fail to load and play. (Each of the 41 elements can have its source re-assigned, but every second re-assignment also fails silently. I would love to see the code behind these bugs...)</li> <li>IE10 and IE11 "stutter" when playing short sounds: they play a fraction of a second, then pause, then continue on. The effect to the end-user is that the audio is unintelligible. (The <code>audio</code>s have <code>preload="auto"</code> and report a non-zero buffer.)</li> </ul> <p>Naturally there's no practical way to feature-detect these issues, hence the browser-detect. I generally feel user-agent sniffing is too dicey for production code; the <code>@cc_on</code> technique seemed more robust.</p> <p>My workaround for IE9 is to serialise the app state to <code>sessionStorage</code> after the 25th sound, then reload the page and deserialise.</p> <p>In IE10/11, my workaround is to play the last 90% of the audio at 0 volume, which seems to force IE to <em>actually</em> buffer the file.</p>
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    1. COIE11 removed support for conditional compilation.
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    2. CO@Qantas94Heavy can you provide a source for that? As I say in the question, MSDN is telling me *explicitly* that IE11 has support for conditional compilation. Hence, confusion.
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    3. COThat's just from anecdotal experience, don't have a source for that :(
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