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2-ui/2-events/01-introduction-browser-events/03-which-handlers-run/solution.md

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+The answer: `1` and `2`.
+
+The first handler triggers, because it's not removed by `removeEventListener`. To remove the handler we need to pass exactly the function that was assigned. And in the code a new function is passed, that looks the same, but is still another function.
+
+To remove a function object, we need to store a reference to it, like this:
+
+```js
+function handler() {
+  alert(1);
+}
+
+button.addEventListener("click", handler);
+button.removeEventListener("click", handler);
+```
+
+The handler `button.onclick` works independantly and in addition to `addEventListener`.