It doesn't work on IE7/IE8 nor IE9/IE10 with a different error about htmlpreview.github.com HOT 7 CLOSED

Now it works in IE10 and IE9, but it won't work in IE8 due to incorrect execution of JavaScript. Please upgrade your browser.

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From developer's perspective:

Upgrade my browser? You kidding me?
I'm using htmlpreview for running tests, to show that my github library works on IE7/IE8 as well (for those who are concerned about backward compatibility.

From end user's perspective:

You can't uprade from IE8 on a XP computer. A lot of big corporates won't upgrade their XPs, sadly.

From my pserspective:

Your code is perfectible.
From minified version

a=[].slice.call(document.getElementsByTagName("iframe")).concat([].slice.call(document.getElementsByTagName("frame")));

This is wrong, because document.getElementsByTagName returns a NodeList not an Array.
Why do you need to call slice anyways?

a=Array.prototype.concat.apply(Array.prototype.concat.apply([], document.getElementsByTagName('iframe')), document.getElementsByTagName('frame'))

Would work just fine on IE7/8 as well!

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So what's the status?
The above looks like quick fixes to me.

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What [].slice.call(document.getElementsByTagName("iframe")) does is just converts a NodeList to Array in order to build one array of all iframes and frames in a document. I have changed that line and it seems to work OK in IE8 (checked in IE10 in IE8 compatibility mode), so it must be something else that breaks HTMLPreview in IE8.

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How is that? It doesn't work at all.
Look here for a fair-working answer: http://stackoverflow.com/a/13318066/219349

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I have changed the code according to your remark and it works in all modern browsers. I don't have IE8, but it worked using IE8 mode in IE10. What's the error you got?

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Excellent, now IE8 works just perfect.
I don't have IE8 native too, but simulating IE8 compatibility mode is always a good 100% test for javascript issues.

Now IE7 has some bigger problems :)
SEC7112: Script from https://raw.github.com/dotnetwise/Javascript-FastClass/master/src/Scripts/Tests/qunit.js was blocked due to mime type mismatch

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