Compare the two.
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01
Understand the problem
events
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02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
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03
03
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Give it an honest attempt first — then compare your thinking with the full walkthrough.
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04
Read the code
Independent: cancel default vs stop bubbling
// preventDefault — stop the page reload, handle the form yourself
form.addEventListener("submit", (e) => {
e.preventDefault(); // browser won't navigate/reload
submitViaFetch(new FormData(form));
});
// stopPropagation — keep the button click from reaching the card handler
card.addEventListener("click", () => console.log("card clicked"));
buttonInsideCard.addEventListener("click", (e) => {
e.stopPropagation(); // "card clicked" will NOT log
console.log("button only");
// e.stopImmediatePropagation() would also block other listeners here
});
// They're independent: preventDefault does NOT stop bubbling, and vice versa.05
05
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