I've tried using textContent and innerHTML, but haven't been able to change hello world to goodbye.
<div data-test='hello'>
hello world
</div>
var test = document.querySelectorAll("[data-test='hello']");
//test.textContent = "goodbye";
test.innerHTML = "goodbye";
Definition by documentation: The querySelectorAll() method returns all elements in the document that matches a specified CSS selector(s), as a static NodeList object.
The querySelectorAll method return an array, then you can change the first element as follow:
var test = document.querySelectorAll('[data-test="hello"]');
test[0].innerHTML = "goodbye";<div data-test='hello'>
hello world
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