[css-ui-4] Broken references in CSS Basic User Interface Module Level 4

[dontcallmedom-bot]

While crawling CSS Basic User Interface Module Level 4, the following links to other specifications were detected as pointing to non-existing anchors, which should be fixed:

• https://w3c.github.io/contentEditable/#dfn-editing-host

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

[tabatkins]

This is a misfire caused by the contentEditable spec being live-compiled by ReSpec; the anchor exists in the document after ReSpec is finished running. (Tho whether it successfully navigates to the anchor is dependent on timing.)