A Mathematics tutoring web application for kids has a button that highlights all even numbers (in span), using 'yellow' as the background color. Clicking the button again removes the background. All further clicks add or remove the 'yellow' background alternately.

Currently, the button doesn't work as expected. For the given HTML markup and JavaScript function, select all options that will identify and fix the bugs in the JavaScript function:

<div id='numbers'>
 <button id='btn' onclick='toggleEvenColor()'>Toggle even number highlighting</button>
1: function toggleEvenColor() {
2:   let spanElements = document.querySelectorAll('#numbers span');
3:   spanElements.forEach(function() {
4:     item.style.backgroundColor = 'transparent';
5:   });
6: }

(Select all acceptable answers.)

At line number 2, use let spanElements = document.querySelector('#numbers span:nth-child(2n)');
At line number 2, use let spanElements = document.querySelectorAll('#numbers span:nth-child(2n)');
At line number 2, use let spanElements = document.getElementsByTagName('span');
At line number 3, define item as a parameter for the anonymous function passed in forEach.
At line number 3, define event as a parameter for the anonymous function passed in forEach.
At line number 4, use item.style.background = 'yellow';
At line number 4, use item.style.backgroundColor = item.val() / 2 === 0 ? 'yellow' : 'transparent';
At line number 4, use item.style.backgroundColor = item.style.backgroundColor !== 'yellow' ? 'yellow' : 'transparent';

JavaScript Attribute Manipulation Bug Fixing Selectors Styling New Public


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