Last Modified: Jan 07, 2026
Affected Product(s):
BIG-IP APM
Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5
Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3 HF2
Opened: Jun 14, 2013 Severity: 3-Major Related Article:
K17116
JavaScript does not work if a page contains conditional comments inside its head tag.
JavaScript does not work.
Presence of conditional comments contain very first script tag. Example: <html> <!--[if lt IE 9]> <script src="foo.js"></script> <![endif]--> <script> document.write("foo"); </script> </html>
To work around the problem, use an iRule. The exact commands to use depend on the situation.
The issue has been fixed by adding necessary JavaScript includes into every conditional branch.