How to make a JavaScript function that can delete/modify text/tags from the HTML?

[hrstissiaopai]

I need to make a script that can modify the already existing header tag. So in the <header> it says "Original Content" and I need to change it to "new content". I have to do that using the <button> tag and an event handler, but I have no idea what to use after the onclick. I also have another button that has to delete the text of the <header>. Is that a whole different story? Any answer will be appreciated.

[Dormilich]

I also have another button that has to delete the text of the <header>. Is that a whole different story?

no, the only difference is that you replace the current content with empty/no content.

what you need to look at are DOM functions (accessing and modifying HTML elements).

[hrstissiaopai]

I know I have to user some property of the document object, but which one?

[Dormilich]

e.g. textContent