Not to mention lower height when in landscape mode. Websites that don't disable sticky headers (or other elements) are useless because those fixed elements now take up most of the screen.
But that seems to be most sites these days. I have this bookmarklet invokable with a keyboard shortcut:
javascript:let i, elements = document.querySelectorAll('body *'); for (i = 0; i < elements.length; i++) { if(getComputedStyle(elements[i]).position === 'fixed' || getComputedStyle(elements[i]).position === 'sticky'){ elements[i].parentNode.removeChild(elements[i]); } }
That zaps fixed and sticky elements, so I can actually see the content. (I like the Vivaldi browser because I can assign keys to many things.)