Which statement correctly describes window.sessionStorage?

Which statement correctly describes window.sessionStorage?

• A. HTML global attribute
• B. stores data for one session (data is lost when the browser tab is closed)
• C. stores data with no expiration date
• D. runs JavaScript in the background, without affecting the performance of the page

Answer: (B)

window.sessionStorage is part of the Web Storage API and is scoped to a single browser tab. It stores data for the duration of that tab’s session, so you can read and write values as you navigate within the same tab, and the data survives page reloads. But once you close that tab, the stored data is cleared. This lifetime and scope make the statement describing data stored for one session and lost when the tab is closed the best fit. It isn’t an HTML attribute, so that part isn’t correct. It doesn’t run JavaScript in the background; it’s a storage mechanism, not a background process. And while localStorage can persist data indefinitely, sessionStorage is designed to be cleared when the tab closes, so the “no expiration date” idea isn’t accurate for it.

window.sessionStorage is part of the Web Storage API and is scoped to a single browser tab. It stores data for the duration of that tab’s session, so you can read and write values as you navigate within the same tab, and the data survives page reloads. But once you close that tab, the stored data is cleared. This lifetime and scope make the statement describing data stored for one session and lost when the tab is closed the best fit.

It isn’t an HTML attribute, so that part isn’t correct. It doesn’t run JavaScript in the background; it’s a storage mechanism, not a background process. And while localStorage can persist data indefinitely, sessionStorage is designed to be cleared when the tab closes, so the “no expiration date” idea isn’t accurate for it.