A quiz page has a form. When the visitor tries to send the form with an empty answer, a handler must show a warning and prevent the browser from moving to the results page. Which event should the handler listen for?

A search box should update a message showing the number of characters immediately whenever its text value changes. Which event does the page need?

A page has a dropdown menu, and its details panel should update after the visitor chooses a different option. Which event should run the update?

A page must fill in today's greeting as soon as the page has finished loading, before the visitor interacts with any element. Which event should trigger that code?

A password field should reveal a short hint at the moment the visitor places the text cursor in that field. Which event is needed?

A form should check whether an email address has an @ symbol after the visitor leaves the email field. Which event best matches that moment?

A game page must block the browser's usual action when the visitor presses the Enter key in a text field. Which event should the handler use to detect the key before that action occurs?

A page has Start and this script: let count = 0; document.getElementById("go").addEventListener("click", function() { count = count + 1; console.log(count); }); The visitor clicks Start three times. What appears in the console?

A page contains Add and this script: let total = 5; document.getElementById("add").addEventListener("click", function () { total = total + 2; console.log(total); }); The visitor presses Add twice. What appears in the console?

A page has Light and this script: let on = false; document.getElementById("light").addEventListener("click", function() { on = !on; console.log(on); }); The visitor clicks Light three times. What appears in the console?

A page has Vote and this script: let votes = 0; document.getElementById("vote").addEventListener("click", function() { console.log(votes); votes = votes + 1; }); The visitor clicks Vote twice. What appears in the console?

A page contains Next and this script: let page = 1; document.getElementById("next").addEventListener("click", function () { page++; console.log("Page " + page); }); The visitor presses Next twice. What appears in the console?

A page has Score and script: let points = 10; document.getElementById("score").addEventListener("click", function() { points = points - 3; console.log(points); }); Score is clicked three times. What appears in the console?

A page contains Waiting and Go. A function named showMsg is already defined. Which line makes pressing Go run showMsg?

A page contains and a function named checkName. Which statement attaches checkName so it runs whenever the input's value changes?

A page contains and a function named validate. Which line attaches validate to the form's submit event?

A page contains Help and a function named openHelp. Which line correctly makes the button run openHelp when clicked?

A page contains and a function named showHint. Which line makes showHint run when the field receives focus?

A page contains Press and this script: function greet() { console.log("Hi"); } document.getElementById("btn").addEventListener("click", greet()); The page loads, then the visitor presses Press twice. What happens?

A page has Save and script: let saved=0; function record(){ saved=saved+1; console.log(saved); } document.getElementById("save").addEventListener("click", record()); Page loads, then Save is clicked. What appears in the console?

A page contains Menu and this script: function showMenu() { console.log("Open"); } document.getElementById("menu").addEventListener("click", showMenu()); Why does the code fail to save showMenu as the button's handler?

A page contains Close and this script: function leave() { console.log("Closing"); } document.getElementById("close").addEventListener("click", leave()); Which change makes Closing appear only when Close is pressed?

A page contains Save and Quit, plus this script: document.getElementById("quit").addEventListener("click", function () { console.log("Goodbye"); }); Which action puts Goodbye in the console?

A page contains and , plus this script: document.getElementById("email").addEventListener("blur", function () { console.log("Check field"); }); Which action logs Check field?

A page contains Red and Blue, plus this script: document.getElementById("red").addEventListener("click", function () { console.log("Color selected"); }); Which visitor action runs this handler?