Final answer:
Memory leakage in JavaScript is caused by the application continuously using memory without releasing it. Common causes include uncleared variables and DOM elements still referenced by code.
Step-by-step explanation:
Memory leaks in a JavaScript application are primarily caused by the improper management of memory, specifically when an application continuously uses memory without releasing it when no longer needed. Two common causes are when variables or functions that are no longer in use remain in memory or when the DOM elements that were removed are still referenced by JavaScript code.
To measure memory leakage, developers can use tools such as Chrome DevTools. These tools provide features like the Timeline and Profiles sections which allow for in-depth monitoring of memory usage over time. Tracking down memory leaks involves looking for a continuous increase in memory usage, particularly when the same functionality is repeatedly triggered. Memory leaks can be measured using tools like Chrome DevTools, which monitor memory usage over time.