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Ok, let me fight to make your product bugfree.

I have tested it more, and turned out that the problem is not the reserved word (if "stop" is reserved at all), but not checking the data[i] existence before referencing its ".stop" value, and IE8 will drop an error if you try to access undefined.stop.

The situation is the following on IE8:

// line 8555 : jQuery.js
// inside the for ( i in data ) loop
data["olddisplay"] = null
data["olddisplay"].stop = // "Object required" error in IE8
data["events"] = [object Object] // ... more elements of the data array
data["events"].stop = undefined
data["handle"] = function( e ) {}
data["handle"].stop = undefined

The solution in IE8 could be either checking data[i] before referencing data[i].stop or providing " " as default value for "olddisplay".

In "normal" browsers it looks the following:

data["olddisplay"] = ''
data["olddisplay"].stop = undefined // No error

I hope now you understand why is not an "invalid" request.

Thanks,

Laza

Please provide a complete reduced test case on jsFiddle to help us assess your ticket! Additionally, be sure to test against the jQuery Edge version to ensure the issue still exists. To get you started, use this boilerplate: http://jsfiddle.net/FrKyN/ Open the link and click to "Fork" (in the top menu) to get started.

I'm going to look into this one, but a "null" in the data could definitely cause a bug there.

https://github.com/jquery/jquery/pull/594

Here's a demonstration of the bug:

http://jsfiddle.net/h6ANN/5/

Sorry it was me, lazahu@gmail.com.

The opacity bug can be observed too on this example:

http://jsfiddle.net/h6ANN/6/

Ensuring that nulls in private data object won't cause errors on stop() - Fixes #10750

Changeset: 499d7e409c4f4d4ed255148e59552763cccf4260