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This seems to be an extreme edge case that is impacted by the number of elements that can load external resources in the body of the document. For this ticket, the element is an iframe. In development, the iframe is loading facebook like buttons. In the test case I've provided, the iframe is loading jquery.com. Both produce the same result.

As the number of iframes in the body increases, the chance of the script error occurring also increases.

jsFiddle test case: http://jsfiddle.net/Z2dzz/

I'm hoping the jsFiddle is enough. In any event, I've provided two screenshots of a local running version of the test case.

Loading jQuery 1.7 Asynchronously:

[[Image(http://businessbullpen.com/images/jquery/10737/Asynchronous.png)]]

Loading jQuery 1.7 Synchronously:

[[Image(http://businessbullpen.com/images/jquery/10737/Synchronous.png)]]

EDIT: my post pretty much mirrors what the description states.

Without going into too much detail about async stuff, the issue seems to be that there is an inconsistent behaviour in order of execution:

https://github.com/jquery/jquery/blob/master/src/support.js#L314

I've had to wrap those two lines in a if statement to temporarily avoid this problem.

if (testElement !== null) {
  testElement.innerHTML = "";
  testElementParent.removeChild( testElement );
}

It appears that the code block above (which runs on jQuery onload) clears the testElement. Therefore triggering this error.

https://github.com/jquery/jquery/blob/master/src/support.js#L309

testElement = container = null;

Hope this helps.

Move clearing the support vars to before the offset doc ready call in case the offset tests are run synchronously. Fixes #10737.

• Adding a test for this would probably slow the manipulation tests significantly, but it's simple enough.

Changeset: d5897098510faba7f1c14fdd0ad961add42fb5c1

#10769 is a duplicate of this ticket.

#10790 is a duplicate of this ticket.