tooltips
This example demonstrates a simple tooltip that appears when the user hovers over a circle in an SVG. The tooltip is a div element created with d3.select that becomes visible on mouseover, follows the cursor using page coordinates on mousemove, and hides on mouseout. The code uses D3 v7 to append an SVG circle with specified stroke, fill, radius, and position attributes, and binds the mouse events directly to that circle. The tooltip’s text is static, and no external data source is used.