In some solutions to “trigger file downloads with JavaScript” questions, the pattern

link = document.createElement('a')
link.click()

is used.

In various places, people report that this did not work in Firefox, suggesting that you need document.body.appendChild(link); first:

• Download File Using JavaScript/jQuery
• document.createElement(‘a’).click() not working in firefox

It does work in my Firefox 125 which is newer than those answers.

Do the HTML/DOM/JavaScript specs prescribe that .click() needs to work even without appending to the DOM?

(Bonus points for anybody who can find the commit in Firefox that made this work.)