Quick answer
Declare SVG, PNG, and ICO browser candidates in the shared head, then add 192×192 and 512×512 ordinary and maskable icons to the web app manifest.
- Last verified
- July 31, 2026
- Evidence
- Primary documentation plus transparent editorial analysis
- Primary sources
- 3
Ship the browser and install layers
Declare SVG, PNG, and ICO browser candidates in the shared head, then add 192×192 and 512×512 ordinary and maskable icons to the web app manifest.
Every declared URL must return the correct image response on the production hostname; markup alone cannot compensate for a rewrite, MIME mismatch, or missing build artifact.
Connected next stepFavicons in Firefox: Tabs, Bookmarks, SVG, and Cache Testing for the closest prerequisite or comparison.
Keep host-level identity consistent
Microsoft documents that saved-site icons can fall back from an exact URL cache to a host-level cache. If unrelated page types on one hostname advertise different icons, a saved New Tab entry can show the wrong host-level result.
Use one intentional site icon across ordinary pages, or test route-specific icons in tabs, Favorites, New Tab, and installed-app surfaces before release.
Connected next stepChrome Favicons: Tabs, Android, PWAs, and Cache Checks for the next connected implementation decision.
Refresh evidence in the right order
Request the icon files directly and use the live checker first. If the production bytes are current but Edge still shows an old saved icon, revisit the exact saved URL and then clear cached images and files if necessary.
Treat deleting a local favicon database as a last-mile client diagnostic, not a deployment fix. Other visitors need cacheable public assets that naturally revalidate.
Connected next stepOpen the most relevant production tool and verify the decision with a working output.
Review the headings, sources, implementation artifact, and update record for this guide as structured JSON.
Download guide evidence ↓- Guide
- Favicons in Microsoft Edge: Tabs, Favorites, PWAs, and Cache
- Coverage
- Client behavior can change by browser, operating system, platform version, cache state and deployment configuration. Unperformed manual observations are not claimed.
Questions, answered
Why can Edge show a PDF icon for a saved site?+
Microsoft documents a host-level cache fallback that can reuse an icon associated with another URL on the same host.
Does a working tab prove the PWA icon works?+
No. The manifest and its ordinary and maskable assets are a separate discovery and install path and should be validated independently.