whatwg/html#443

Spec: Step 24.6 of https://html.spec.whatwg.org/multipage/#prepare-a-script

Gecko initialization for module hooks
https://searchfox.org/mozilla-central/source/dom/script/ScriptLoader.cpp#990-1006