Why Doesn't jQuery's `:not()` Selector Behave Like CSS's `:not()`?

Why is jQuery's :not() Selector Not Working in CSS?

jQuery's :not() selector, while claiming to be CSS3 Compliant, exhibits significant differences in functionality compared to the :not() pseudo-class defined in CSS3.

Differences in Syntax and Functionality:

• Passing Multiple Selectors: jQuery allows passing a comma-separated list of selectors to :not(), but CSS3 :not() only accepts a single simple selector.
• Combining Simple Selectors: jQuery allows combining multiple simple selectors into compound selectors for use with :not(), while CSS3 does not.
• Using Combinators: jQuery supports the use of combinators in :not() selectors, while CSS3 does not.

Consequences:

When attempting to use the jQuery :not() selector directly in CSS, it may fail to work as intended due to these syntax and functionality differences. The example provided in the question illustrates this issue.

CSS3 Workarounds:

To bypass these limitations, CSS3 provides the following workarounds:

• Multiple :not() Selectors: Chain multiple :not() selectors together to negate multiple simple selectors.
• Splitting Compound Selectors: Break compound selectors into multiple negations.
• Alternative Methods: Use alternative CSS-based methods, such as combining pseudo-classes and combinators.

Note:

CSS3 will eventually support the enhanced :not() selector defined in Selectors 4, which allows for more extensive functionality. However, this is still a future standard and is not widely implemented.

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