Are there any behavior discrepancies or variance in browser compatibility when comparing the usage of CSS3 selectors :enabled versus not(:disabled)?
I anticipate them to be essentially the same in functionality, and since they are both CSS3 selectors, I assume browser support would also be consistent across the board.
A distinction exists between :not(:disabled) and elements that are neither :enabled nor :disabled. This pertains to elements like div, p, ul, etc., where the enabled/disabled semantics do not apply.
The specification acknowledges this:
What defines an enabled or disabled state, as well as a user interface element, is specific to each language. In most documents, the majority of elements will not fall under either
:enabledor:disabled.
Interestingly, there isn't a corresponding :unchecked pseudo-class for :checked, despite not all elements having checked/unchecked semantics either. More on this can be found in my response to this inquiry.
If you add a type selector (like input, select, or textarea) or a class selector to these pseudo-classes, the issue becomes less relevant. Nonetheless, it's advisable to opt for :enabled over :not(:disabled).
Most browsers exhibit identical support for the majority of level 3 pseudo-classes, with none exclusively supporting either :enabled or :disabled. However, MDN mentions that Opera 9.0 and Safari 3.1 may not endorse :not(), even though they do endorse :enabled and :disabled. Additionally, IE7 has limited support for substring-matching attribute selectors and the general sibling combinator ~, with slight improvements in IE8.
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