Assume an HTML textarea that you bound the change event to it with textarea.onchange = ..., or textarea.addEventListener('change', ...).
I want to modify it like textarea.textContent = '...' or textarea.value = '...' and this to trigger the aforementioned change event.
This is not a duplicate question as the others I've found here imply the use of jQuery. I do not want to use jQuery, I know it saves lives and stuff but I'm fine without it, thanks. :^)