In this detailed explanation found on this website, it is discussed why jQuery UI uses CSS classes like .ui-state-active that are applied through JavaScript, rather than utilizing existing CSS pseudo-classes like :active. What is the reasoning behind this approach?
Recently, I came across some interesting information:
The :active pseudo-class is primarily used for and supported by various browsers on
<a> and <button>.
jQuery UI has classes like .ui-state-active to easily apply styles to:
<ul>, <span>, <li>, <div>
Many jQuery UI elements are constructed using these building blocks.
As Niet the Dark Absol mentioned, including the additional class provides support for browsers that do not utilize HTML5, such as IE8 and earlier versions.
http://api.jquery.com/category/version/1.7/
Enhanced HTML5 Support for IE6/7/8
According to caniuse.com, iOS Safari and android also lack support for pseudo selectors - therefore, the extra class ensures compatibility for these devices as well.
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