From the jQuery 1.7rc1 source:

noData: {
    "embed": true,
    // Ban all objects except for Flash (which handle expandos)
    "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
    "applet": true
},

What is clsid:D27CDB6E-AE6D-11cf-96B8-444553540000?

From the jQuery 1.7rc1 source:

noData: {
    "embed": true,
    // Ban all objects except for Flash (which handle expandos)
    "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
    "applet": true
},

What is clsid:D27CDB6E-AE6D-11cf-96B8-444553540000?

• javascript
• jquery

• 6 Google is a great tool for finding what a guid is: google./search?q=D27CDB6E-AE6D-11cf-96B8-444553540000 – Greg Hewgill Commented Oct 29, 2011 at 20:38
• 1 I've made the search, but I don't understand the results. – Randomblue Commented Oct 29, 2011 at 20:39
• 2 If you read the ment in the code and the first result from Google, it makes perfect sense. – Ivan Commented Oct 29, 2011 at 20:48
• 1 This is now the first result listed. We've e full circle! – Oran D. Lord Commented Mar 17, 2017 at 18:17
• {D27CDB6E-AE6D-11CF-96B8-444553540000}, Microsoft’s GUID for representing Shockwave Flash, which you might be able to find in a museum at the moment. – Константин Ван Commented Jun 29, 2019 at 20:58

2 Answers 2

Whenever an object is not a Shockwave flash object, setting expando properties won't work ("expando property"), as uncatchable errors will be thrown. From a glance at the source, this method is interna

From the source:

// The following elements throw uncatchable exceptions if you
// attempt to add expando properties to them.
noData: {
    "embed": true,
    // Ban all objects except for Flash (which handle expandos)
    "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
    "applet": true
},

Search in the source for noData, and many references with appropriate ments appear.

According to the code, the point is to

Ban all objects except for Flash (which handle expandos)

This means that the line "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" is used to blacklist Flash objects. The first result from Google states that the GUID stores "configuration data for the policy setting Shockwave Flash".