With WordPress 6.9, numerous legacy features that were used to support Internet Explorer have been removed. All versions of Internet Explorer have been unsupported in WordPress since version 5.8, released in July 2021. These changes continue the process of removing code that existed only to provide support for these browsers.
Removed Support for IE Conditional Scripts and Styles
Conditional comment support was added for scripts in WordPress 4.2, and for styles sometime around version 2.6.0, but was made more easily available in WordPress 3.6.
Conditional comments were a mechanism to pass scripts and styles for specific versions of IE. The
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