Broken Web App Manifest Link
1 Intentional Issuesrel=manifest is declared twice, once with no href at all and once with whitespace, so the page claims installability it cannot deliver.
#59Issue #59: link_rel_manifest — manifest link declared with no usable href
No manifest.webmanifest file is published anywhere on this site, on purpose. The check never fetches the manifest — it grades the tag — so publishing one would not change the finding, whereas adding a valid href above would.