Bug 11361 – Dynamically added script element is executed twice if its parent is also a dynamically create element

• Component: JavaScriptCore
• Status: RESOLVED FIXED

It seems that a dynamically added script element is executed twice if its parent is also a dynamically create element.  Consider the following code:

    var script1 = document.createElement("script");
    script1.type = "text/javascript";
    script1.innerHTML = "alert('script1');";

    var container = document.createElement("div");
    container.appendChild(script1);

    document.body.appendChild(container);

When this code is run, the "alert('script1');" code is executed twice.  If you change the last line to:

    document.body.appendChild(script1);

Then the "alert('script1');" code is only executed once.

*** This bug has been confirmed by popular vote. ***

[Mark Rowe (bdash)]

This has been fixed on ToT.  It works as expected in the latest nightly build.

[What is the correct Bugzilla resolution in this instance?  FIXED suggests we explicitly fixed this issue, while WORKSFORME suggests it was never broken]

[Alexey Proskuryakov]

(In reply to comment #2)
> [What is the correct Bugzilla resolution in this instance?  FIXED suggests we
> explicitly fixed this issue, while WORKSFORME suggests it was never broken]

I prefer the WORKSFORME resoultion, because such reports should ideally be re-checked for regressions before release (if the problem "magically" disappeared, we may not have an automated test). Bugs that we could never reproduce usually end up as INVALID.