CSS Or Selector

*:is(.a, .b).c{...}

Source: stackoverflow.com

What is css selector

div { color: red; } // the "div" in .css is a selector targeting all <div> elements
simpleSelector = document.querySelectorAll()("div"); // all divs 
complexSelector = document.querySelector("div.user-panel.main input[name='login']")  // the first <input> element with the name "login" (<input name="login"/>) located inside a <div> whose class is "user-panel main" (<div class="user-panel main">) in the document is returned

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