"You click on an element, and a small bubble appears to display additional details. Behind that simple click, there tends to be JavaScript performing calculations to determine the correct position for the tooltip. Let's try to place it at the top. Nope, not enough space. Let's try the bottom instead. It's also touching the right edge so let's shift it a bit to the left."
"Kidding! We'll be using CSS and I will show how the modern anchor positioning API can help us with all this. None of the weight and performance concerns of JavaScript here. At the time of writing, only Chrome and Edge have full support of the features we will be using. Click-and-drag the anchor and see how the tooltip behaves. It will try to position itself in a way to remain visible and avoid any overflow."
Tooltips often require JavaScript to calculate positions and avoid clipping against viewport edges. The Anchor Positioning API combined with CSS can position tooltips responsively without JavaScript, eliminating weight and performance concerns. At the time of writing, full feature support exists in Chrome and Edge. Interactive demos can move an anchor and show the tooltip remaining visible and avoiding overflow. Anchor and tooltip elements can exist separately in the DOM while CSS handles their placement. For accessibility and maintainability, keeping anchor and tooltip elements close and associating them is recommended. Different HTML structures may be chosen depending on content and use case.
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