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jQuery's Support for CSS3 Selectors: An In-Depth Examination
While jQuery claims to support a wide range of CSS selectors, the question of whether it truly supports selectors like :nth-last-child() has resurfaced. Let's delve into this topic and understand the limitations and exceptions.
Limited Support for CSS3 Selectors
Despite stating compliance with Selectors Level 3, jQuery does not fully implement the standard. Its selector documentation clarifies that it incorporates elements from CSS 1-3 and adds its own custom selectors.
Exception: :nth-last-child() and Other Level 3 Selectors
Starting with jQuery 1.9, nearly all Level 3 selectors are supported in the Sizzle selector library, except for a handful of limitations:
Fallbacks and Compatibility
jQuery uses the native document.querySelectorAll() implementation whenever possible. If document.querySelectorAll() fails or is not supported, jQuery falls back to Sizzle. This means that selectors like :nth-last-child() may work in browsers that support them natively, even if jQuery itself does not.
Recommendation:
If you require full support for Level 3 selectors like :nth-last-child(), it is recommended to upgrade to jQuery 1.9 or later, which adds support for these selectors while maintaining compatibility with older IE versions. Alternatively, consider using jQuery's custom selector extensions to implement the missing selectors yourself.
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