Image descriptions help visitors who are blind or have low-vision access the information contained in images. Description also makes it easier to find images through the image’s content as opposed to the caption or title of the object that it depicts. This document outlines types of descriptions, the structure of a description, and recommendations to help guide writing descriptions (with examples).

Yet another Lazy Loading JavaScript library, why?<br><br>Existing lazy loading libraries hook up to the scroll event or use a periodic timer and call getBoundingClientRect() on elements that need to be lazy loaded. This approach, however, is painfully slow as each call to getBoundingClientRect() forces the browser to re-layout the entire page and will introduce considerable jank to your website.<br><br>Making this more efficient and performant is what IntersectionObserver is designed for, and it’s landed in Chrome 51. IntersectionObservers let you know when an observed element enters or exits the browser’s viewport.