Salesforce JavaScript Developer Practice Exam

If a paragraph is clicked in a nested div structure, what will be the order of logged outputs?

1. p div

2. div p

3. p

4. div

The correct answer is: p div

When a DOM element is clicked, events bubble up from the target element (the one clicked) back to the root of the document, unless the event is specifically set to be captured instead. In the case of a nested div structure containing paragraphs, if you click on the paragraph, the event will first be fired for the paragraph itself and then will bubble up to its parent div. In this scenario, the logged outputs will reflect the order in which the events are fired. The paragraph element is the target of the click event, so that will be logged first. Following that, the event will bubble up to the containing div, which will be the next one logged. Therefore, the correct order of the logged outputs, when a paragraph is clicked in a nested div structure, is "p div". This understanding of event propagation in the DOM is fundamental for manipulating and responding to user interactions in web development, particularly in the context of frameworks like Salesforce that utilize JavaScript heavily for rich user interfaces. Knowing this flow helps developers effectively manage event listeners, prevent undesirable behaviors, and enhance user experience through accurate event handling.