The fetchPriority property of the HTMLImageElement interface represents a hint to the browser indicating how it should prioritize fetching a particular image relative to other images. It reflects the <img> element's fetchpriority content attribute.
A string whose value is one of high, low, or auto. For their meanings, see the HTML fetchpriority attribute.
const img = new Image();
img.fetchPriority = "high";
img.src = "img/logo.png";HTMLLinkElement.fetchPriorityHTMLScriptElement.fetchPriorityLink header