Ceci est la solution que je suis finalement arrivé avec (avec beaucoup de commentaires.)
//This floating div function will cause a div to float in the upper right corner of the screen at all times. However, it's not smooth, it will jump to the proper location once the scrolling on the iPhone is done. (On my Mac, it's pretty smooth in Safari.)
function flaotingDiv(){
//How much the screen has been zoomed.
var zoomLevel = ((screen.width)/(window.innerWidth));
//By what factor we must scale the div for it to look the same.
var inverseZoom = ((window.innerWidth)/(screen.width));
//The div whose size we want to remain constant.
var h = document.getElementById("fontSizeDiv");
//This ensures that the div stays at the top of the screen at all times. For some reason, the top value is affected by the zoom level of the Div. So we need to multiple the top value by the zoom level for it to adjust to the zoom.
h.style.top = (((window.pageYOffset) + 5) * zoomLevel).toString() + "px";
//This ensures that the window stays on the right side of the screen at all times. Once again, we multiply by the zoom level so that the div's padding scales up.
h.style.paddingLeft = ((((window.pageXOffset) + 5) * zoomLevel).toString()) + "px";
//Finally, we shrink the div on a scale of inverseZoom.
h.style.zoom = inverseZoom;
}
//We want the div to readjust every time there is a scroll event:
window.onscroll = flaotingDiv;
largeurs de pourcentage ne fonctionnerait pas avec mes DIV pour une raison quelconque, c'est ce que j'avais essayé après la première, mais mon Les origines de Div disparaîtraient. – Oliver