Detecting when asynchronous plugins (KaTeX) finish

[lenianiva]

I want to leverage the \htmlId macro in KaTeX to produce math animations, but the KaTeX plugin in Reveal is asynchronous. Suppose that I have \htmlId{target}{x} in a block of KaTeX. Executing

deck.initialize().then(() => {
	const elemTarget = document.getElementById("target");
});

Does not always give back an element. Is there a way to force this code to run after KaTeX is ready?