You likely saw this because adds this attribute to images by default to boost site speed automatically.
: Normally, decoding a large image can "block" the browser from rendering text or other elements. async allows the browser to keep showing the rest of the page while the image is being prepared in the background. <img decoding="async" class="alignnone size-ful...
The snippet you provided refers to the attribute, which is a modern web optimization used in tags to improve page performance. What it Does You likely saw this because adds this attribute
: It tells the browser it can decode the image "off the main thread". The snippet you provided refers to the attribute,
decoding="async" height="x" loading="lazy" · quarto-dev · ... - GitHub
: It helps avoid "jank" (stuttering) while scrolling, though on very slow connections, it might mean the text appears slightly before the images pop in. Common Context: WordPress