<img Decoding="async" Class="alignnone Size-ful... -

decoding="async" height="x" loading="lazy" · quarto-dev · ... - GitHub

The snippet you provided refers to the attribute, which is a modern web optimization used in tags to improve page performance. What it Does <img decoding="async" class="alignnone size-ful...

: 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 decoding="async" height="x" loading="lazy" · quarto-dev ·

: It tells the browser it can decode the image "off the main thread". Common Context: WordPress : It tells the browser

: 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.

You likely saw this because adds this attribute to images by default to boost site speed automatically.