This means if we have an observing 3 elements and only 1 changes dimensions, the array will only contain the 1 element that changed. The constructor takes a single parameter of a callback that will be invoked with an array of ResizeObserverEntries each time any observed element’s container changes size. The ResizeObserver is a browser API that offers the ability to watch one or more elements and take an action when their container changes size. Rendering the same chart on a mobile device and on an ultra wide screen 4k+ monitor will require much different settings for things like labels and legends.
Moreover we need to control elements that may not be easily styled by CSS, a chart for example. With that in mind, we need to have similar controls to those offered by queries in CSS, but at the element level. We need to handle a wide variety of screen sizes, especially mobile. Responsive design is a fundamental building block of any web application these days. My hope with this article is to give a general overview of the ResizeObserver, and how to use it most effectively. Occasionally we will run into situations where the controls CSS provide simply aren’t enough, and when that happens we need to look for new tools. This definitely applies to layout controls in CSS. As with every rule, once we understand the reasons for it, we can begin to understand when to break it.
In general I like to keep all of my layout control in CSS.
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