Chapter 6
Observing the DOM
Examples
Recipe 6.1
Lazy Loading an Image
Defer loading of an image until it is scrolled into view.
Recipe 6.2
Wrapping an IntersectionObserver with a Promise
Create a Promise that is resolved once a given element becomes visible.
Recipe 6.3
Automatically Pause and Play a Video
Pause a playing video if it scrolls out of view.
Recipe 6.4
Animating Changes in Height
Animate changes in height when an element's content is toggled.
Recipe 6.5
Change an Element’s Content Based on Size
Change the contents of an element, depending on its size.
Recipe 6.6
Applying a Transition When an Element Scrolls Into View
Make content appear with an animation effect as it is scrolled into view.
Recipe 6.7
Using Infinite Scroll
Automatically load more content when scrolling to the bottom of a container.
