Q.Write the JavaScript and HTML needed so that clicking a button changes the text of a paragraph (id="msg") to "Welcome!".

This tests using an event handler and the DOM to change page content without reloading.

Interactivity comes from an event (the click) triggering an event handler (our function), which changes the page through the DOM.

<p id="msg">Hello</p>
<button onclick="showWelcome()">Click</button>

<script>
  function showWelcome() {
    document.getElementById("msg").innerHTML = "Welcome!";
  }
</script>
``` …

Instead of an onclick attribute in the HTML, the handler can be attached in JavaScript with document.getElementById("btnId").onc …

Misspelling the id, or confusing innerHTML (the content) with value (used for form inputs). getElementById returns nothing if the …