IE conditional comments for XHTML_HTML/Xhtml_Web page production

Conditional comments are a unique function of IE, which can process separate XHTML code for IE series products. Note that it is mainly for XHTML, not CSS.
Conditional comments are very powerful and can be used to judge true and false, for example:
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Conditional comments can be used by IE to determine what version of the browser it is, and the content will be displayed if the conditions are met. The comment function is supported from IE5.0 to 7.0, and the version number is accurate to 4 decimal places:
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IE conditional comments also support exclamation mark non-operation:
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And supports prefixes to determine whether it is a higher version or a lower version:
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The full name of gt here is greater than, which means the version above the current conditional version, but does not include the current version.
There are several other prefixes:
lt means less than the version below the current conditional version, excluding the current version.
gte means greeter than or equal to the current version or above, and includes the current version.
lte means less than or equal to the version below the current version and includes the current version.