I think all components now have the following comment and code somewhere:
/*
Cloning contents from a <template> element is more performant
than using innerHTML because it avoids additional HTML parse costs.
*/
const template = document.createElement('template');
template.innerHTML = `...`
template.content.cloneNode happens in constructor, the comment about cloning being faster than innerHtml, however, is right there beside an innerHTML.
UPD: It's even more confusing on anything that's less than 1400px in width (all comments jump above the blocks they reference)