Browser Compatibility - Nextedy Documentation

Supported Browsers

Powersheet supports the same browsers that Siemens Polarion ALM officially supports. The client application uses modern web standards including CSS Grid, Flexbox, and ES2015+ JavaScript features.

Browser	Minimum Version	Support Level	Notes
Google Chrome	Latest stable	✅ Full	Recommended browser for best performance
Microsoft Edge (Chromium)	Latest stable	✅ Full	Chromium-based Edge only
Mozilla Firefox	Latest stable	✅ Full	ESR releases also supported
Safari	Latest stable	Partial	See Safari-specific limitations
Internet Explorer 11	N/A	❌ Not supported	Polarion has deprecated IE 11 support
Microsoft Edge (Legacy)	N/A	❌ Not supported	EdgeHTML engine not supported

Always check the Siemens Polarion ALM release notes for the official browser support matrix for your Polarion version. Powersheet inherits these requirements.

Recommended Browser

Google Chrome (latest stable release) is the recommended browser for Powersheet. Chrome consistently delivers the best performance for:

Large sheets with hundreds or thousands of rows
Complex expansion paths across multiple entity type levels
Inline editing with real-time validation
Export operations (Excel)
Keyboard shortcut responsiveness

Microsoft Edge (Chromium-based) provides equivalent performance since it shares the same rendering engine.

Browser Feature Requirements

Powersheet relies on the following browser capabilities. All features listed below are available in current versions of Chrome, Edge, and Firefox.

Feature	Used For	Minimum Standard
JavaScript (ES2015+)	Sheet rendering, editing, query execution	ECMAScript 2015
CSS Grid	Sheet layout and column alignment	CSS Grid Level 1
CSS Flexbox	Toolbar, menus, and dialog layout	CSS Flexible Box Layout
Fetch API	Server communication for data and metadata	Fetch Living Standard
Web Storage (localStorage)	Persisting user preferences (language, view)	Web Storage API
Clipboard API	Copy/paste operations in the sheet	Clipboard API
SVG rendering	Icons and visual elements	SVG 1.1
CSS Custom Properties	Theming and conditional styling	CSS Custom Properties

Powersheet does not require Flash, Java applets, Silverlight, or any other browser plugin. It runs entirely on native browser APIs.

Polarion Version Compatibility

Powersheet is a server extension deployed into Polarion. The Polarion version determines which browsers are supported at the platform level.

Polarion Version	Browser Policy
Polarion 2310 and later	Latest versions of Chrome, Edge (Chromium), Firefox, Safari
Polarion 2304	Latest versions of Chrome, Edge (Chromium), Firefox, Safari
Polarion 2301 and earlier	Check Siemens release notes for your specific version

The exact Polarion version requirements for your Powersheet release are listed in the Powersheet release notes bundled with the installation package. Check the RELEASE-NOTES.md or README file in your distribution archive.

Safari-Specific Limitations

Safari is supported for general sheet viewing and editing, but some features may behave differently due to WebKit engine differences.

Area	Limitation	Workaround
Keyboard shortcuts	Some key combinations conflict with macOS system shortcuts	Use Chrome on macOS for full keyboard shortcut support
Copy/paste	Clipboard API behavior may differ for rich content	Use plain-text paste (`Cmd+Shift+V`)
Large sheets	Memory management differences with very large datasets	Reduce visible rows or use query filtering
File download	Export file download dialogs may appear differently	Configure Safari to allow automatic downloads from the Polarion domain
CSS rendering	Minor visual differences in cell borders and header alignment	No workaround needed; functionality is not affected

Safari Private Browsing restricts localStorage access. User preferences such as the selected language in the YAML editor and column visibility presets may not persist between sessions when Private Browsing is active.

Internet Explorer 11

Internet Explorer 11 is not supported. Powersheet uses modern JavaScript features (arrow functions, template literals, destructuring, Promises, async/await, CSS Grid) that are not available in IE 11. Attempting to load Powersheet in IE 11 results in a blank page or JavaScript errors. Siemens has also ended IE 11 support in recent Polarion versions. If your organization still requires IE 11, upgrade to Microsoft Edge (Chromium-based) for full compatibility.

Microsoft Edge (Legacy)

The legacy version of Microsoft Edge using the EdgeHTML engine is not supported. Only the Chromium-based Edge (version 79 and later) is compatible. Chromium-based Edge is the default on Windows 10 version 20H2 and later, and all versions of Windows 11. To check which version of Edge you are running, navigate to edge://settings/help in the Edge address bar.

Screen Resolution and Display

Parameter	Recommendation
Minimum resolution	1280 x 720 px
Recommended resolution	1920 x 1080 px or higher
High-DPI / Retina	Supported — Powersheet renders correctly at all display scaling factors
Zoom level	80% to 150% (browser zoom)
Minimum viewport width	1024 px for sheets with multiple visible columns

When working with requirements traceability matrices (RTM) that span multiple entity types (e.g., UserNeed to SystemRequirement to DesignRequirement), a wide monitor or multi-monitor setup significantly improves usability. Each expanded level adds columns to the right, and horizontal scrolling is reduced with more screen real estate.

Performance Considerations by Browser

Performance varies based on the number of visible rows, columns, and expanded entity levels. The table below provides general guidance for large sheets.

Scenario	Chrome / Edge	Firefox	Safari
Sheet with < 500 rows	Excellent	Excellent	Excellent
Sheet with 500 — 2,000 rows	Excellent	Good	Good
Sheet with 2,000 — 5,000 rows	Good	Good	Fair
Sheet with > 5,000 rows	Fair	Fair	Use query filtering
Deep expansion (4+ levels)	Good	Good	Fair
20+ visible columns	Excellent	Excellent	Good
Concurrent editing (multiple tabs)	Supported	Supported	Supported

Actual performance depends on Polarion server capacity, network latency, and the complexity of your data model. The values above reflect client-side rendering performance only.

Browser Cache and Versioning

Powersheet uses version-based cache busting for its JavaScript and CSS assets. When you upgrade Powersheet on the server, the browser automatically loads the new version of client-side files.

Behavior	Details
Cache strategy	Versioned URLs with cache-control headers
JavaScript files	Cached per version; new version forces fresh download
CSS files	Cached per version; new version forces fresh download
Configuration data	Not cached in browser; loaded fresh on each sheet open
User preferences	Stored in `localStorage`; persist across sessions

If you experience issues after a Powersheet upgrade, perform a hard refresh:

Browser	Hard Refresh Shortcut
Chrome / Edge (Windows)	`Ctrl+Shift+R`
Chrome / Edge (macOS)	`Cmd+Shift+R`
Firefox (Windows)	`Ctrl+Shift+R`
Firefox (macOS)	`Cmd+Shift+R`
Safari	`Cmd+Option+R`

Alternatively, clear the browser cache for the Polarion domain only:

Open browser developer tools (F12 or Ctrl+Shift+I)
Right-click the refresh button
Select Empty Cache and Hard Reload (Chrome/Edge) or clear storage from the Application tab

Content Security Policy

Powersheet respects the Content Security Policy (CSP) configured on the Polarion server. If your organization enforces a strict CSP, ensure the following are permitted:

Directive	Requirement
`script-src`	Must allow inline scripts or the Powersheet script source domain
`style-src`	Must allow inline styles for dynamic cell formatting
`connect-src`	Must allow connections to the Polarion server origin
`img-src`	Must allow the Polarion server origin for icons and images
`font-src`	Must allow font sources used by Polarion

CSP configuration depends on your Polarion deployment and any reverse proxy or web application firewall in front of it. Consult your infrastructure team if Powersheet features are blocked by CSP violations (visible in the browser developer console).

Network Requirements

Powersheet communicates with the Polarion server over standard HTTP/HTTPS. No additional network ports or protocols are required beyond what Polarion already uses.

Requirement	Details
Protocol	HTTPS recommended; HTTP supported
WebSocket	Not required
Polling	Not used; data loaded on demand
Proxy support	Standard HTTP proxy compatible
Offline mode	Not supported; requires active connection to Polarion server

Accessibility

Powersheet provides keyboard navigation for common sheet operations. Accessibility feature support varies by browser.

Feature	Chrome / Edge	Firefox	Safari
Keyboard cell navigation	Yes	Yes	Yes
Tab-based focus management	Yes	Yes	Partial
Screen reader compatibility	Basic	Basic	Basic
High-contrast mode	Follows OS setting	Follows OS setting	Follows OS setting

Accessibility support is an evolving area. Check the latest Powersheet release notes for updates on WCAG compliance and screen reader compatibility improvements.

Troubleshooting Browser Issues

Symptom	Likely Cause	Resolution
Blank sheet, no errors	JavaScript blocked by browser extension	Disable ad blockers or script blockers for the Polarion domain
Sheet loads but editing is unresponsive	Outdated browser version	Update to the latest stable release
Visual glitches in cell borders	Browser zoom not at 100%	Reset zoom to 100% (`Ctrl+0` / `Cmd+0`)
Export fails silently	Pop-up blocker preventing download	Allow pop-ups for the Polarion domain
Preferences not saved between sessions	Private/incognito browsing mode	Use a standard browsing session
Slow initial load after upgrade	Stale browser cache	Perform a hard refresh (`Ctrl+Shift+R` / `Cmd+Shift+R`)
“There is an error in the app” message	Client-side error state	Reload the page; check browser console for details
Keyboard shortcuts not working	Focus is outside the sheet area	Click inside the sheet, then retry the shortcut

For additional troubleshooting steps, see Troubleshooting Guides.

​Supported Browsers

​Recommended Browser

​Browser Feature Requirements

​Polarion Version Compatibility

​Safari-Specific Limitations

​Internet Explorer 11

​Microsoft Edge (Legacy)

​Screen Resolution and Display

​Performance Considerations by Browser

​Browser Cache and Versioning

​Content Security Policy

​Network Requirements

​Accessibility

​Troubleshooting Browser Issues

Supported Browsers

Recommended Browser

Browser Feature Requirements

Polarion Version Compatibility

Safari-Specific Limitations

Internet Explorer 11

Microsoft Edge (Legacy)

Screen Resolution and Display

Performance Considerations by Browser

Browser Cache and Versioning

Content Security Policy

Network Requirements

Accessibility

Troubleshooting Browser Issues