🔰handler options

JS ⟩ browser ⟩ event ⟩ handler ⟩ register ⟩ options

elem.addEventListener(event, handler, {
    once: true,    // automatically removed after it triggers.
    capture: true, // capturing phase
    passive: true, // handler won't call preventDefault()
});

• capture: -> Bubbling and capturing. options can also be false/true, that’s the same as {capture: false/true}.

• passive: -> Browser default actions.

⭐️ 重點

If you pass true to the optional 3rd argument to addEventListener(), the handler is registered as a capturing event handler.

elem.addEventListener(event, handler, true);

📗 參考

• javascript.info ⟩ Introduction to browser events