const content=document.querySelector('.content');
content.innerHTML='<h2 style="background:orange; color:blue; font-family:monospace">This is the new Header</h2>';
document.getElementbyid.innerHTML = "text";
element.innerHTML = "<p>read this</p>" Change the inner HTML of an element
element.style.color = "blue"; Change the style of an HTML element
element.setAttribute(important, "true") Change the attribute value of an HTML element
element.important = "true" Change the attribute value of an HTML element