Broken references in Prioritized Task Scheduling

[dontcallmedom-bot]

While crawling Prioritized Task Scheduling, the following links to other specifications were detected as pointing to non-existing anchors, which should be fixed:

• [ ] https://html.spec.whatwg.org/multipage/webappapis.html#concept-source
• [ ] https://html.spec.whatwg.org/multipage/webappapis.html#concept-document

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