What is the method to invoke a function that I have created in an extension when a button is pressed?

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You can use the onClick event to invoke your function when the button is clicked. Here's an example:

HTML:

<button id="myButton">Click me!</button>

JavaScript:

function myFunction() {
  // Your function code goes here
}

document.getElementById("myButton").addEventListener("click", myFunction);

In this example, we are using addEventListener to listen for the "click" event on the button with the ID "myButton", and then invoking our function "myFunction" when the button is clicked.