Element application uses the fetch api to download images and convert them to a blob that is then requested. The problem is that the blob request is failing due to invalid HTTP header in response. The invalid header is Content-Security-Policy that is generated by the blob loader using the security context policy. The document policy comes from http-equiv meta and contains newlines, which are allowed there, but invalid for an HTTP header value.
Pull request: https://github.com/WebKit/WebKit/pull/7540
<rdar://problem/103550552>
Committed 258130@main (d89d47f7fd45): <https://commits.webkit.org/258130@main> Reviewed commits have been landed. Closing PR #7540 and removing active labels.