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HTML <details> Element Not Retaining State Across Page Reloads in Modern Browsers

👀 Views: 439 💬 Answers: 1 📅 Created: 2025-06-06
html local-storage details HTML

I'm implementing an HTML `<details>` element to create collapsible content sections on my page. The problem arises when a user expands a section and then reloads the page; the section collapses again, losing the state. I need the expanded state to persist across reloads so that users can seamlessly return to their last viewed content. I've tried using local storage to save the state when the user expands or collapses the `<details>` element. However, it seems that I might be missing something, as the state doesn't restore correctly upon page reload. Here's a simplified version of my code: ```html <details id='myDetails'> <summary>Click to expand</summary> <p>This is some collapsible content.</p> </details> <script> const details = document.getElementById('myDetails'); // Load saved state from local storage if (localStorage.getItem('detailsState') === 'open') { details.open = true; } // Save state on toggle details.addEventListener('toggle', () => { localStorage.setItem('detailsState', details.open ? 'open' : 'closed'); }); </script> ``` When I refresh the page after expanding the `<details>` element, the state should ideally remain expanded, but instead, it always collapses back to the default state. I’ve tested this in both Chrome and Firefox, and they both exhibit the same behavior. I'm using HTML5 and local storage should work across these modern browsers, so I'm wondering if there's something I've overlooked. Any insights into why this isn't working as expected would be greatly appreciated! My development environment is macOS.