msMatchesSelector
msMatchesSelector is a legacy DOM API method on the Element interface that tests whether a given element would be selected by a specified CSS selector. It is the Microsoft-prefixed version of the standard Element.matches method and was used in older Microsoft browsers. The method returns a boolean: true if the element would be selected by the selector, false otherwise.
Usage involves calling the function on an element with a CSS selector string. For example, element.msMatchesSelector('.active')
Compatibility and fallbacks: Historically, different browsers exposed vendor-prefixed variants such as msMatchesSelector (Microsoft), webkitMatchesSelector (WebKit-based browsers),