Broken references in Fenced Frame

[dontcallmedom-bot]

While crawling Fenced Frame, the following links to other specifications were detected as pointing to non-existing anchors:

• [ ] https://html.spec.whatwg.org/multipage/document-sequences.html#creator-base-url

_{This issue was detected and reported semi-automatically by Strudy based on data collected in webref.}